EP2889152A1 - Élément de sécurité destiné à représenter au moins une information variable optiquement - Google Patents

Élément de sécurité destiné à représenter au moins une information variable optiquement Download PDF

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Publication number
EP2889152A1
EP2889152A1 EP14004282.1A EP14004282A EP2889152A1 EP 2889152 A1 EP2889152 A1 EP 2889152A1 EP 14004282 A EP14004282 A EP 14004282A EP 2889152 A1 EP2889152 A1 EP 2889152A1
Authority
EP
European Patent Office
Prior art keywords
embossing
elements
security element
embossing elements
element 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.)
Granted
Application number
EP14004282.1A
Other languages
German (de)
English (en)
Other versions
EP2889152B1 (fr
Inventor
Martin Imhof
Peter Franz
Walter DÖRFLER
Thanh-Hao Huynh
Astrid Heine
Alexander Bornschlegl
Christian Fuhse
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.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient GmbH
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Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2889152A1 publication Critical patent/EP2889152A1/fr
Application granted granted Critical
Publication of EP2889152B1 publication Critical patent/EP2889152B1/fr
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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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser

Definitions

  • the invention relates to security elements for displaying at least one optically variable information, methods for producing such security elements and a data carrier with such security elements.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are thereby equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • the present invention has for its object to provide a security element of the type mentioned above with high security against imitation and attractive visual appearance, which can ideally be checked for authenticity even by laymen.
  • the requirement that the embossing elements have identical basic shape means that the defect-free basic shape of the embossing elements is identical, but allows that the embossing elements have different sizes.
  • the basic shapes of the embossing elements are therefore similar in mathematical sense but not necessarily congruent. In advantageous designs, however, the basic shapes of the embossing elements are even congruent, so in addition to the identical shape, they also have the same size.
  • the embossing elements of identical basic shape have a random size distribution within a particular one Size interval on.
  • the size of the local defects preferably scales with the size of the embossing elements, so that the relative proportions are obtained despite different absolute sizes.
  • the optically active elements may be formed as reflective or refractive optical elements.
  • the optically active elements are designed such that they have no optically diffractive effect.
  • the optically active elements are formed by curved structures, in particular by concave or convex curved structures.
  • the domed structures together with the reflective layer advantageously form concave mirrors (concave domed mirrors) or domed mirrors (convex domed mirrors).
  • the arched structures may in particular be spherically curved, astigmatic or channel-shaped.
  • the grooves can be straight or curved.
  • the formation of the curved structures as Fresnel structures is also considered.
  • the defects are in this case advantageously arranged on one or more of the annular regions of the Fresnel structure.
  • the optically active elements may also be formed by pyramidal structures.
  • the base of a pyramidal optically active element can be any polygon, in particular a triangle, quadrangle or hexagon. All mentioned forms can be executed as depressions or elevations.
  • the embossing elements are formed by depressions. It may offer in some designs, in addition to lower the defective embossing elements of the base in order make the optically variable information more clearly visible, for example in the form of a contour line. Accordingly, in the training as surveys, the defective embossed elements may be additionally increased relative to the base.
  • the optically active elements are formed by lenses arranged above the reflection layer, wherein the lenses are preferably arranged at a distance of substantially half a focal length above the reflection layer.
  • the local defects are advantageously integrated into the lens surface.
  • the reflection layer is flat in this embodiment with advantage and forms a plane mirror. As explained in more detail below, such a security element can be made substantially thinner than conventional lens designs with a comparable optical impression, since the focal plane of the lens lies on the lens itself through the mirror plane.
  • the embossing elements have recesses which are filled with a transparent or translucent material, in particular a transparent or translucent lacquer.
  • the transparent or translucent material can also be in the form of a cover layer which completely covers the reflection layer.
  • the depressions are preferably filled by printing technology, in particular by screen printing or flexographic printing processes, advantageously using a lacquer which cures at elevated temperature or under UV irradiation.
  • the local defects are formed in a preferred embodiment of the invention in each case by a bulge, a concavity, a recess, in particular a Demetällmaschine, or a modification of the surface structure of the basic shape of the embossing elements.
  • the modification can For example, in a blackening or other discoloration, or in a change in the reflection properties (smooth / rough, higher / lower reflectivity) exist.
  • micro- or nanostructures such as holograms, moth-eye structures or sub-wavelength gratings, a modification of the surface structure can be achieved.
  • the local defects represent embossing substructures within the embossing elements, which preferably have been produced simultaneously with the embossing elements. This allows a particularly effective production, since the production of the embossing elements and the local defects then requires only one step. In addition, a perfect registration of embossing elements and defects is ensured, even if, for example, production-related dimensional variations occur in the embossing element grid.
  • the local defects occupy only a small part of the surface of the basic shape of the embossing elements, in particular less than 33%, preferably even less than 10%.
  • a sharply defined visibility range for the optically variable information is created, on the other hand, several different optically variable information can be accommodated in a stamping element grid.
  • the local defects are preferably spaced from the base of the embossing elements, so that all the embossing elements have an encircling, defect-free region adjoining the base surface. This ensures in particular that the optically variable information is not already visible without directed illumination or from all viewing angles is. The optical variability and the copy protection effect are enhanced in this way.
  • the local defects are advantageously arranged acentrically within the basic shape.
  • the local defects outside the center of the basic shape are arranged on one of the flanks of the basic shape.
  • the shape of the local defects in all embossing elements of the subset is the same and / or the local defects in all embossing elements of the subset are introduced at the same point of the basic shape of the embossing elements.
  • the size of the local defects can also be the same, namely in particular if the size of the embossing elements of the subset is the same.
  • the size of the local defects preferably scales with the size of the embossing elements, so that the relative proportions of defects and embossing elements remain unchanged.
  • the shape or color of the defects may also change slowly across the surface of the embossing element grid.
  • the size of the defects scales favorably with the size of the embossing elements.
  • the defect position changes slowly within the basic shape so that the viewing direction from which the defects are visible also changes slowly.
  • a slow change means that the viewing direction from which a defect is visible changes from one embossing element to the next only by a small angle, namely by 4 ° or less, preferably even by only 2 ° or less.
  • the defects arranged at different positions become visible one after the other when the security element is tilted or rotated.
  • the embossing elements of the subset and the local defects can also be arranged in each case in a periodic grid whose grid periods differ slightly and / or which are rotated relative to one another, so that beating effects and / or moire effects can occur.
  • the raster periods advantageously differ by less than 10%, in particular less than 5% or even less than 2%. If the grid are rotated against each other, the rotation is advantageously less than 5 °, in particular less than 2 ° or even less than 1 °.
  • the local defects are preferably in the form of characters or patterns.
  • the spacing of adjacent optically active elements is at least in one spatial direction not more than 20%, preferably not more than 10%, particularly preferably not more than 5% of the smallest dimension of the base area of the embossing elements.
  • the base area of the embossing elements typically has a smallest dimension of 2 ⁇ m to 2000 ⁇ m.
  • the embossing layer ie the layer in which the grid of the embossing elements is formed, is a film or film-based, the smallest dimension is preferably between 5 ⁇ m and 500 ⁇ m, in particular between 10 ⁇ m and 300 ⁇ m.
  • the embossing depth, or in the case of elevations the embossing height, is typically between 3 .mu.m and 200 .mu.m.
  • the optically active elements have different size, wherein preferably the size of the local defects in the subset of the embossing elements with the size of the basic shape of Scaling stamped elements.
  • the size of the optically active elements may vary regularly or irregularly, for example according to a random distribution.
  • the security element can also represent a plurality of optically variable information, each formed by a provided with defects subset of the embossing elements.
  • different defects are preferably provided in different subsets and / or are introduced in different subsets defects at different points of the basic shape of the embossing elements.
  • two information can be coded by defects arranged on opposite flanks of the embossing elements, so that the respective information is only visible from substantially opposite viewing directions.
  • the carrier substrate contains an intaglio feature which is arranged in register with the grid of optically active elements. As explained further below, can be achieve this by the generation of intaglio feature and embossing element grid in a common print and embossing step.
  • the carrier substrate can be made of paper, in particular cotton velvet paper, plastic or a composite consisting of different materials.
  • the reflection layer has the highest possible reflection, wherein preferably 30% or more of the reflected intensity is attributable to the directed reflection.
  • the reflection layer can be formed in particular by a layer with metallic pigments, for example silver pigments, in a binder.
  • the reflection layer is preferably applied by screen printing in this case.
  • the reflection layer can also be formed by a metallic or metallized film, or by an applied metal patch in the form of a metallized, z. B. with aluminum or silver vaporized cold or hot stamping foil.
  • Single or multilayer highly reflective layers or colored layers of high surface quality can also have a reflective effect and thus be used according to the invention as a reflection layer.
  • the grid of the optically active elements is preferably periodic in at least one spatial direction.
  • the symmetry of the grid is advantageously selected from the group square grid, rectangular grid, diamond grid, hexagonal grid and parallelogram grid.
  • adjacent optically active elements in a grating direction have a fixed center distance a (distance of the centers of the adjacent optically active elements).
  • a distance of the centers of the adjacent optically active elements
  • a 325 ⁇ m and the random number from the interval [-20 ⁇ m, + 50 ⁇ m] can be selected so that the center distance of adjacent elements varies randomly in the range [305 ⁇ m, 375 ⁇ m].
  • Periodic variations of the midpoint distance lead to superlattices, which can also be regarded as beating of the grating period.
  • a a 0 + a 1 sin 2 ⁇ x / 10 * a 0
  • a 1 is much smaller than a 0 and a 0 is much smaller than a ÜG .
  • Much smaller here means a factor of 3 or more, in particular of 5 or more, in the superlattice period even advantageously 10 or more. It is understood that other superlattice periods may also be considered, as well as identical or different superlattice periods in different grid directions.
  • the reflection layer can be applied to the carrier substrate by printing technology, preferably by flexographic or screen printing methods.
  • the carrier substrate may be a rough substrate, such as a paper or cotton canvas paper substrate, but also a smooth substrate, such as a polymeric substrate or a multilayer composite film, particularly a composite of several different films or a paper-film composite.
  • the embossing of the embossing elements or embossed structures is preferably carried out by intaglio printing, in particular by blind embossing.
  • intaglio printing By simultaneously using color-guiding intaglio printing and a colorless blind embossing on the same stitching machine, it is possible to integrate different designs on the carrier substrate in different subregions of the substrate with register accuracy.
  • Such a register-accurate arrangement is not adjustable, if the production steps run separately and therefore gives the security element an extremely high security against counterfeiting.
  • the defects represent embossing substructures which are produced in an embossing step simultaneously with the embossing elements.
  • the defects are produced by laser application of defect-free embossing elements.
  • the at least partially transparent or translucent carrier substrate may consist of a transparent or translucent film, or of paper, which is partially recessed and sealed with a transparent or translucent film.
  • a transparent or translucent film is for example a film of polyamide, polyester, polyethylene or biaxially oriented polypropylene into consideration.
  • the film can also be colored.
  • the refractive optical elements are formed by curved structures, in particular by concavely curved or convexly curved structures.
  • the arched structures may be formed in particular spherically curved, astigmatic or channel-shaped.
  • the grooves can be straight or curved.
  • the formation of the curved structures as Fresnel structures is also considered.
  • the defects are in this case advantageously arranged on one or more of the annular regions of the Fresnel structure.
  • the refractive optical elements can also be formed by pyramidal structures.
  • the base of a pyramidal refractive optical element may be any polygon, in particular a triangle or a quadrangle. All mentioned forms can be executed as depressions or elevations.
  • the embossing elements have recesses which are filled with a transparent or translucent material, in particular a transparent or translucent lacquer.
  • the transparent or translucent material may or may not have the same refractive index as the transparent or translucent region of the carrier substrate.
  • the filling of the recesses is preferably carried out by printing technology, in particular in the screen printing or flexographic printing process, wherein advantageously used at elevated temperature or curing under UV irradiation varnish.
  • the statements made in connection with the first aspect of the invention apply.
  • the local defects are advantageously formed in each case by a bulge, a concavity, a recess, or a modification of the surface structure of the basic shape of the embossing elements.
  • the local defects represented embossing substructures within the embossing elements, which are produced in particular simultaneously with the embossing elements.
  • the invention further includes a data carrier with a security element of the type described.
  • the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, but also an identity card, such as a credit card Trade bank card, cash card, authorization card, ID card or passport personalization page.
  • the security element may be arranged in an advantageous variant of the invention, in particular in or over a window area or a through opening of the data carrier.
  • FIG. 1 shows a banknote 10 with a security element 12 according to the invention for displaying an optical variable information.
  • the security element 12 In directional illumination of the security element 12, such as daylight or the light of a flashlight, appears for a viewer 14 from a predetermined viewing direction 16 encoded in the security element information 18, in the exemplary embodiment, the letter sequence "PL".
  • the security element appears from other viewing directions 12 on the other hand with a homogeneous metallic reflective appearance.
  • the security element 12 is an effective copy protection, since its appearance can not be reproduced with today's copiers.
  • FIGS. 2 and 3 schematically a plan view and Fig. 3 show a cross section of the security element 12.
  • the security element 12 includes a carrier substrate 20 having a first major surface 22 and an opposing second major surface 24.
  • the carrier substrate 20 is made of paper, but in other configurations it may also be formed by a foil or a paper-foil composite.
  • a shiny metallic mirror layer 26 is arranged, which is formed for example by a screen-applied layer of silver-colored pigments.
  • the mirror layer can be formed for example by a colored coating of high surface quality, which also has a reflective effect.
  • a grid of optically active elements was then produced by an embossing step, which are formed by embossing elements 30, 32 each having an identical basic shape.
  • the embossing elements 30, 32 are hollow-sphere sections, so that together with the mirror layer 26, a grid of hollow mirrors of identical basic shape is formed.
  • the embossing elements 30, 32 each have a diameter of 300 .mu.m, an embossing depth of about 75 .mu.m, and are in a square grid with a grid Rw ( Fig. 8 ) of 325 microns.
  • the distance between adjacent embossing elements results from the difference of the grid width Rw of the square grid and the diameter of the embossing elements 30, 32 (which here corresponds to the smallest dimension of the base of the embossing elements 30, 32) and is 25 microns in the embodiment.
  • embossing elements In a subset of embossing elements, namely in the in FIGS. 2 and 3 designated by the reference numeral 32 embossed elements, local defects 34 was introduced by laser demetallization each on a flank, through which the visual appearance of the embossing elements 32 is changed viewing angle dependent.
  • the demetallization locally significantly reduces the reflectivity of the mirrored flanks, so that the embossing elements 32 appear with significantly different brightness depending on the viewing direction.
  • the subset of the defective embossed elements 32 forms the desired optically variable information, in this case the letter sequence "PL".
  • the local defects 34 are the same in all embossing elements 32 of the subset and, moreover, are all introduced at the same point within the basic shape of the embossing elements 32.
  • the viewer 14 From the viewing direction 16, the viewer 14 collectively perceives the defects 34 introduced on the left flank of the embossing elements 32, so that the defective embossed elements 32 form a contrast with the defect-free embossing elements 30 and make the optically variable information "PL" visible. From other viewing directions, such as the viewing direction 36, however, the observer 14 also looks at the defect-affected embossing elements 32 to unchanged regions of the basic shape, so that there is no contrast between the defective ones from these directions Embossing elements 32 and the defect-free embossing elements 30 is formed and the optically variable information is not visible. When changing the viewing direction or when turning or tilting the security element 12 so creates an easily recognizable and secure retrievable information change.
  • FIG. 4 shows for illustrative purposes some basic shapes of embossing elements which can form suitable optically active, in particular reflective or refractive optical elements. It is understood that in a security element not only an embossing element, but in each case a grid of a plurality of such embossing elements is provided and that a subset of the embossing elements is additionally provided with local defects.
  • the embossing elements of Fig. 4 are imprinted in a stamping layer 40, which may be formed, for example, by a carrier substrate provided with a reflective layer, by a transparent or translucent foil or by an embossing lacquer layer present on a reflective layer.
  • the embossing elements 42 have already been in the FIGS. 2 and 3 described and are formed by spherical segment-shaped depressions in the embossing layer 40.
  • the embossing elements 44, 46 also represent depressions in the embossing layer 40, but with a parabolic instead of a spherical depression cross-section.
  • the embossing element 44 illustrates a rotationally symmetrical design with a circular base surface, while the embossing element 46 has a groove-shaped design.
  • the grooves can be straight or curved. Also embossed elements with elliptical base and parabolic depression cross-section are possible.
  • the embossing elements 44-K, 46-K are a modification of the embossing elements 44, 46, in which the parabolic depression cross-section is tilted in one direction, so that an asymmetrical design results.
  • the tilt angle is advantageously between 5 ° and 40 °, in particular between 5 ° and 30 °.
  • polygonal base and side surfaces for the embossing elements come into consideration, as shown by way of example with reference to the pyramidal embossing element 48.
  • the base of a pyramidal embossing element 48 may be any polygon, in particular a triangle or a quadrilateral, while the side surfaces are each formed by triangles.
  • the embossing elements can not only form depressions, but also be formed by elevations from the embossing layer 40, as illustrated by the hemispherical embossing element 50. As elevations come in inverted form the same geometric shapes as for the wells in question. All of the shapes shown may also be in a truncated geometry, for example in the form of a truncated sphere section or truncated paraboloid, or in the form of a truncated cone or truncated pyramid.
  • the cutting plane may be parallel to the base of the embossing element, but may also include an angle with this, which is typically between 15 ° and 45 °.
  • the base area of the embossing elements typically has a smallest dimension of 2 ⁇ m to 300 ⁇ m, in some applications also up to 2000 ⁇ m. If the embossing layer is a film or film-based, the smallest dimension is preferably between 5 ⁇ m and 50 ⁇ m, in particular between 10 ⁇ m and 30 ⁇ m.
  • the embossing depth, or in the case of elevations the embossing height, is typically between 3 .mu.m and 200 .mu.m.
  • arched mirrors are formed by the embossing elements 42 to 50 as reflective optical elements, wherein the embossing elements 42-48 concave mirror and the embossing elements 50 represent arching mirror.
  • Channel-shaped embossing elements such as the embossing elements 46 and 46-K, produce cylindrical hollow or bulging mirrors which can be used in particular for the practically important tilting or movement effects in which only tilting about an axis is provided.
  • FIG. 5 illustrates some embodiments of the introduced in the basic form of the embossing elements local defects.
  • the first embossing element 60 is provided with a local bulge 62
  • the second embossing element 64 with a local concavity 66
  • the third embossing element 68 with a local recess 70 in the form of demetallization of the metallic reflection layer 26, and the fourth embossing element 72 with a local modification region 74, in which the visual appearance of the reflection layer 26 is changed.
  • the modification region 74 may, for example, be formed by blackening or another discoloration, or else by a region with different reflection properties, for example due to different local roughness of the reflection layer.
  • the modification region 74 may also include micro- or nanostructures, such as holograms, moth-eye structures, or sub-wavelength gratings, which also locally change the appearance of the modification region 74.
  • the local defects 62, 66, 70, 74 in each case do not extend to the base surface 76 of the embossing elements, so that all embossing elements have a peripheral, defect-free region 78 adjoining the base surface 76.
  • the local defects usually have a diameter or a smallest dimension of 10 microns or more.
  • the diameter or smallest dimension is 5 .mu.m to 100 .mu.m, it being understood that the size of the defects is usually matched to the size of the embossing elements.
  • each of the local defects occupies less than 33% or even less than 10% of the surface of the basic shape of the embossing elements.
  • the embossing elements 80 present in the reflection layer 26 are formed by pyramids with a square base.
  • a subset of embossing elements 82 has a corrugation 86 as local defects in one of the side surfaces 84, which leads to a strong scattering of the light.
  • the other side surfaces 88 are smooth and therefore reflect the light. Due to the different reflection behavior, the defect-embossed embossing elements 82 from the viewing direction 90 form a clear contrast with the defect-free embossing elements 80 and thereby make the desired optically variable information visible.
  • optically variable information can be seen in such a grid from each of the four directions.
  • up to n different optically variable information can be encoded in a pyramid with n-sided base area, which consists of a respective different spatial direction become visible.
  • the defect-free pyramids form the background before which the defective pyramids appear with contrast to form the optically variable information.
  • the local defects present in the side face 84 of a subset of embossing elements 82 do not extend as far as the base surface of the embossing elements, so that the embossing elements of the subset have a peripheral, defect-free region adjacent to the base surface ,
  • FIG. 7 shows a security element 100 according to another embodiment of the invention, in which two different optically variable information is encoded.
  • the security element 100 is basically like the security element 12 of FIGS. 2 and 3 constructed, in particular, a first subset of embossing elements 32 on a flank first local defects 34, which together give the first optically variable information, in this case the letter sequence "PL" ( Fig. 7 (a) ).
  • second local defects 104 are introduced in a second subset of embossing elements 102 on the opposite flank, by means of which the visual appearance of the embossing elements 102 is changed depending on the viewing angle.
  • the subset of defective embossed elements 102 forms another optically variable information, in this case the value "10" ( Fig. 7 (b) ).
  • the second local defects 104 are the same in all embossing elements 102 of the second subset and are also all introduced at the same location within the basic shape of the embossing elements 102.
  • FIG. 7 (c) shows the grid of the embossing elements with both local defects 34 and 104.
  • the viewer Due to the arrangement of the local defects 34, 104 on opposite flanks of the embossing elements 32, 102, the viewer collectively perceives the defects 34, 104 from opposite viewing directions 16, 106, the defects 34, 104 each contrasting with the defect-free embossing elements 30 and the optically variable information "PL". (from direction 16) or "10" (from direction 106) make visible. From other viewing directions, the viewer also looks in the defect-prone embossing elements 32,102 on unchanged areas of the basic shape, so that from these directions no contrast between the defective embossed elements 32,102 and the defect-free embossing elements 30 is formed and the optically variable information is not visible. It is understood that because of the flat representation of the drawing there, unlike in a real, three-dimensional security element, due to the lack of spatial depth and thus lack of dependence of the visual impression of the viewing direction both defects 34,104 are always visible.
  • the first and second subset need not be disjoint, but may have common elements such that there are embossing elements 108 provided with both a first defect 34 and a second defect 104.
  • FIG. 8 (a) shows by way of illustration a simple square grid consisting of a plurality of square tiles 110.
  • Each tile 110 includes an embossing element 112, in the embodiment an embossing element with a circular base, so that the embossing elements 112 are arranged in a square grid.
  • the clearer presentation is only in the FIGS. 8 (a) and (b) each one of the embossing elements 112 drawn.
  • R W 325 microns.
  • Plotted line border of the tiles serves only to illustrate the shape and size of the tiles and usually corresponds to no physical structure of the security element.
  • the invention is not limited to square grid.
  • Fig. 8 (b) a rectangular grid of a plurality of rectangular tiles 116, each tile 116 includes an embossing element 118 in the embodiment with elliptical base. Again, only one of the embossing elements 118 is shown.
  • hexagonal grids with hexagonal tiles 120 are also suitable, as in FIG Fig. 8 (c) shown.
  • triangular tiles 122 are possible, as in Fig. 8 (d) illustrated.
  • Even more complex tile forms come into consideration, such as the cross-shaped tiles 124 of Fig. 8 (e) , The tile form does not define the shape of the contained or the base of the embossing elements. This can rather be freely chosen within the scope of the invention.
  • FIG. 14 shows a further embodiment, a security element 220, in which the local defects 34 of the defective embossed elements 32 are formed in the form of characters or patterns.
  • the embossing elements 30, 32 are hemispherical hollow spheres in this embodiment, which are arranged in a regular grid, here a square grid of the raster period R p .
  • the local defects 34 are in the embodiment in FIG Form of the letter sequence "PL" formed.
  • the local defects also form a regular square grid whose raster period R D, however, is slightly, for example 2%, larger than the raster period R P of the embossing elements. Accordingly, the relative position of the local defects 34 on the embossment element base shapes slowly changes with the location. Due to the two slightly different grid of the embossing elements and the local defects, the viewing direction, from which a local defect 34 is visible, thus also changes slowly with the location and creates visually impressive moire effects.
  • the security element 230 of the Fig. 15 shows a modification of the embodiment of Fig. 14
  • the local defects 34 of the defective embossed elements 32 are designed in the form of the letter sequence "PL" and are arranged in a defect grid deviating slightly from the embossing element grid, so that the relative position of the local defects 34 on the embossing elements 32 slowly shifts.
  • the embossing elements 32 of the security element 230 have a random size distribution in a certain size interval.
  • the local defects 34 scale with the basic shapes of the embossing elements 32 so that the relative proportions of defects 34 and fundamental shapes are not affected by the size variation.
  • FIG. 9 shows a modification of the embodiment of FIGS. 2 and 3 , wherein the security element 130 of the Fig. 9 in contrast to the design described above, has a transparent film 132 as a carrier substrate.
  • a transparent film 132 Over the reflection layer 26 with the embossing elements 30, 32 may optionally also be applied a transparent resist layer 134, which also fills the recesses of the embossing elements.
  • the subset of the defective embossed elements 32 generates an optically variable information that can be seen against the background of the defect-free embossing elements 30, both on the top side and on the bottom side, respectively, from certain viewing directions, in this case from the viewing direction 16 or 136.
  • a security element 130 may be provided, for example, in a window area or through opening of a banknote or other value document.
  • the security element 140 includes a carrier substrate 20 made of paper, the first main surface is provided with a flat, shiny metallic mirror layer 142.
  • an embossing lacquer layer 144 is arranged, in which a grid of embossing elements 146 in the form of hemispherical depressions is impressed.
  • the optically active elements are not formed by mirrors, but by lenses 162 which are arranged above a plane on the support substrate 20 coated reflective layer 164.
  • the lenses 162 were imprinted into an embossing lacquer layer 166 in the desired pattern, with a subset of lenses 168 on the lens surface being provided with local defects 170, which are shown in FIG Fig. 11 are schematically indicated by dots.
  • the defects 170 may in particular be formed by embossing substructures in the lens surfaces 168 so that the shape of the defects 170 can already be written into the embossing mold for the lenses 162, 168 at the time of origination.
  • the layer thickness of the embossing lacquer layer 166 is selected and matched to the lens shape such that the lenses 162, 168 have a spacing of half the focal length f / 2 from the planar reflection layer 164.
  • the planar reflection layer 164 forms a plane mirror through which the lenses 162, 168 self-image their lens surface and thereby make the presence or absence of the defects 170 in the respective lenses observable as a function of viewing angle.
  • the folding of the beam path through the plane mirror 164 is for vertical viewing through the beam path 172 in FIG Fig. 11 illustrated.
  • the security element is configured for verification using a self-luminous display, such as the display of a smartphone or a computer monitor.
  • the security element 180 shown there has a translucent carrier substrate 182 in the form of a polyester film, which may optionally be colored.
  • a grid of refractive optical elements which are formed by embossing elements 184,186 identical basic shape.
  • the grid of refractive optical elements 184, 186 contains at least one optically variable information that can be detected here by fluoroscopy with a self-illuminating display 200 without auxiliary means.
  • the optically variable information is formed by a subset of embossing elements 186, in which at least one local defect 188 is introduced into the identical basic shape, by means of which the visual appearance of the defect-embossed embossing element 186 is changed depending on the viewing angle.
  • the depressions of the embossing elements 184, 186 are filled with a transparent lacquer 190, which may also have a different refractive index than the carrier substrate 182.
  • the defects 188 result in a fade out and / or a change due to the change in the light beams emanating from the display 190 the display, which indicates the authenticity of the security element.
  • FIG. 13 shows a banknote 210 having a paper substrate 212 and a through opening 214 which is provided with a security element 180 of the type shown in FIG Fig. 12 shown type is closed on one side.
  • the banknote 210 is placed on a self-illuminating display 200 and the optically variable information is retrieved thereby.

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  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Credit Cards Or The Like (AREA)
EP14004282.1A 2013-12-20 2014-12-18 Élément de sécurité destiné à représenter au moins une information variable optiquement Active EP2889152B1 (fr)

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DE102013021806.3A DE102013021806A1 (de) 2013-12-20 2013-12-20 Sicherheitselemente zur Darstellung zumindest einer optisch variablen Information

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Cited By (5)

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EP3279003A1 (fr) * 2016-08-03 2018-02-07 Giesecke+Devrient Currency Technology GmbH Élément de sécurité et procédé de fabrication d'un élément de sécurité
DE102017004682A1 (de) 2017-05-16 2018-11-22 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Absicherung eines Teilprodukts und System mit einem abgesicherten Teilprodukt
EP3511175A1 (fr) * 2018-01-15 2019-07-17 Giesecke+Devrient Currency Technology GmbH Élément de sécurité doté d'une structure optique variable d'éléments estampés agencés de manière statistique
EP3391102B1 (fr) 2015-12-18 2021-01-27 Visual Physics, LLC Film de projection d'image monocouche
CN113147215A (zh) * 2021-05-24 2021-07-23 中钞印制技术研究院有限公司 透明防伪元件及其制造、检测方法和设备、安全物品

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DE102014018512A1 (de) 2014-12-12 2016-06-16 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
DE102015202106A1 (de) 2015-02-06 2016-08-11 Tesa Scribos Gmbh Optisch variables Sicherheitselement
DE102016214407A1 (de) 2016-08-04 2018-02-08 Tesa Scribos Gmbh Optisch variables Sicherheitselement
DE102022000212A1 (de) 2022-01-20 2023-07-20 Giesecke+Devrient Currency Technology Gmbh Sicherheitsmerkmal für ein Verifikationssystem, System, Verfahren und Computerprogrammprodukt zur Verifikation eines mit dem Sicherheitsmerkmal versehenen Gegenstands und Verfahren zum Herstellen eines Sicherheitsmerkmal

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WO2002020280A1 (fr) * 2000-09-08 2002-03-14 Giesecke & Devrient Gmbh Support de donnees dote d'un element optiquement variable
DE102009004128A1 (de) * 2009-01-05 2010-07-08 Giesecke & Devrient Gmbh Sicherheitselement mit optisch variabler Struktur
US20130154250A1 (en) * 2011-12-15 2013-06-20 3M Innovative Properties Company Personalized security article and methods of authenticating a security article and verifying a bearer of a security article
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3391102B1 (fr) 2015-12-18 2021-01-27 Visual Physics, LLC Film de projection d'image monocouche
EP3391102B2 (fr) † 2015-12-18 2023-11-01 Visual Physics, LLC Film de projection d'image monocouche
EP3279003A1 (fr) * 2016-08-03 2018-02-07 Giesecke+Devrient Currency Technology GmbH Élément de sécurité et procédé de fabrication d'un élément de sécurité
DE102017004682A1 (de) 2017-05-16 2018-11-22 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Absicherung eines Teilprodukts und System mit einem abgesicherten Teilprodukt
WO2018210446A1 (fr) 2017-05-16 2018-11-22 Giesecke+Devrient Currency Technology Gmbh Procédé pour protéger un produit partiel et système comprenant un produit partiel protégé
EP3511175A1 (fr) * 2018-01-15 2019-07-17 Giesecke+Devrient Currency Technology GmbH Élément de sécurité doté d'une structure optique variable d'éléments estampés agencés de manière statistique
CN113147215A (zh) * 2021-05-24 2021-07-23 中钞印制技术研究院有限公司 透明防伪元件及其制造、检测方法和设备、安全物品

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