EP2897812B1 - Élément de sécurité à système de visualisation - Google Patents

Élément de sécurité à système de visualisation Download PDF

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Publication number
EP2897812B1
EP2897812B1 EP13770637.0A EP13770637A EP2897812B1 EP 2897812 B1 EP2897812 B1 EP 2897812B1 EP 13770637 A EP13770637 A EP 13770637A EP 2897812 B1 EP2897812 B1 EP 2897812B1
Authority
EP
European Patent Office
Prior art keywords
foil
sub
security element
metallic
depressions
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
EP13770637.0A
Other languages
German (de)
English (en)
Other versions
EP2897812A1 (fr
Inventor
Michael Rahm
Christian Fuhse
Winfried HOFFMÜLLER
Wittich Kaule
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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Publication date
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Publication of EP2897812A1 publication Critical patent/EP2897812A1/fr
Application granted granted Critical
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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
    • B42D25/40—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D2033/10—
    • B42D2033/20—
    • B42D2033/24—
    • B42D2035/20—
    • 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
    • B42D25/45—Associating two or more layers
    • B42D25/455—Associating two or more layers using heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/46—Associating two or more layers using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives

Definitions

  • the invention relates to a security element for securing security papers, documents of value and other data carriers, having a representation arrangement for displaying one or more reference images whose motifs are each formed by visually recognizable, contrasting metallic and non-metallic subregions.
  • the invention also relates to methods for producing such a security element, as well as equipped with a security element disk.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded articles, are often provided with security elements for securing purposes, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • Data carriers in the context of the present invention are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports and other identification documents, credit cards, health cards, as well as product security elements such as labels, seals, packaging and the like.
  • the term "data carrier” in the following includes all such objects, documents and product protection means.
  • Security elements with optically variable elements which give the viewer a different image impression from different viewing angles, play a special role in securing, since these can not be reproduced even with high-quality color copying machines.
  • the security elements can contain a tilting or changing picture, a moving picture or a stereo picture as a display arrangement.
  • Moire magnification arrangements are used as security features.
  • the principle of operation of such Moire magnification arrangements is described in the article " The moire magnifier ", MC Hutley, R. Hunt, RF Stevens and P. Savander, Pure Appl. Opt. 3 (1994), pp. 133-142 , described.
  • moiré magnification thereafter refers to a phenomenon that occurs when viewing a raster of identical image objects through a lenticular of approximately the same pitch. As with any pair of similar rasters, this results in a moire pattern consisting of a periodic arrangement of enlarged and possibly rotated images of the elements of the image raster.
  • motifs Contain the representations of the security elements differently colored motifs, they can be printed usually in a desired shape.
  • the production is more difficult in motifs which are to be formed by contrasting metallic and non-metallic subregions, since metallizations can generally not be generated directly in motif form, but only over the entire surface, for example by vapor deposition of a metal layer in a vacuum vapor deposition process.
  • the present invention seeks to provide a security element of the type mentioned, which can be reliably manufactured with predetermined metallic and non-metallic portions. Also, advantageous methods for producing security elements of the type mentioned are to be specified.
  • the display arrangement of a security element mentioned above comprises a motif layer having a plurality of metallized pixels and non-metallized pixels and a viewing grid spaced from the motif layer of a plurality of viewing elements, the metallized pixels and the non-metallized pixels viewed in association with the Viewing grid to produce the visually recognizable, contrasting metallic and non-metallic portions of the target images.
  • the motif layer according to the invention comprises an embossed structure with elevations and depressions, wherein the non-metallized image elements of the motif layer are formed by non-metallized elevations of the embossed structure and the metallic image elements are formed by substantially metallized depressions of the embossed structure. At least a portion of the substantially metallized depressions contain, in an area fraction between 0.1% and 25%, small, raised support structures which are not visually discernible when viewed with the viewing grid.
  • the depressions with the support structures are referred to as “substantially" metallized in the context of this description.
  • the metallic impression of the metallic picture elements formed by the depressions is not impaired by the support structures for the viewer, since these are not visually recognizable when viewed with the viewing grid.
  • At least some of the substantially metallized depressions contain the support structures in an area ratio of between 2.5% and 10%.
  • the essentially metallized depressions may contain the support structures in an area fraction of more than 25%.
  • the deterioration of the metallic impression by the support structures can be regarded as negligible by the viewer, so that the target images remain visually recognizable, albeit with reduced contrast.
  • the support structures in the depressions are irregular, for example, stochastically distributed.
  • the support structures in the depressions may also be arranged regularly in a grid whose moiré effects with the viewing grid remain below the resolution limit of the human eye or, as explained in more detail below, are completely avoided by suitable arrangement of the support structures with respect to the viewing elements ,
  • the height of the support structures preferably corresponds to the depth of the recesses in which they are arranged. In general, however, the height of the support structures may also be lower, as long as they ensure a sufficient distance of an adhesive-coated acceptor film from the bottom of the recesses in the production, as described in more detail below.
  • the support structures comprise pillars of circular, oval, triangular, rectangular or polygonal cross-section, the cross-section of the pillars preferably having an area between 0.25 ⁇ m 2 and 25 ⁇ m 2 .
  • the support structures comprise irregular, continuous web structures in which the width of the web structures is preferably between 0.1 ⁇ m and 5 ⁇ m.
  • the support structures comprise non-contiguous web elements which each consist of one or more line pieces and whose width is preferably between 0.1 ⁇ m and 5 ⁇ m.
  • the support structures may comprise straight, parallel web elements whose width is preferably between 0.1 ⁇ m and 5 ⁇ m.
  • support structures can be combined with each other so that different recesses contain different support structure types. Also in the same recess several different types of support structures can be provided.
  • the support structures in a subarea contain hidden information in the form of characters or a coding so as to integrate an additional authenticity feature in the security element.
  • all depressions whose dimensions exceed a maximum dimension are of various parameters, in particular the depth of the wells, the pressure used in the laminating process, the Thickness of the adhesive layer, etc. dependent.
  • Advantageous maximum dimensions can be determined by a person skilled in the art for each parameter selection with the aid of less orienting tests.
  • all depressions which have a dimension of more than 30 ⁇ m (maximum dimension) in at least one spatial direction are provided with support structures.
  • the viewing elements of the viewing grid are advantageously formed by spherical lenses, aspherical lenses, cylindrical lenses or one or two-dimensionally focusing micro-cavity mirrors.
  • the viewing elements are formed by pinhole apertures, slotted apertures, mirrored apertured or slit apertures, Fresnel lenses, GRIN lenses (Gradient Refraction Index), zone plates, holographic lenses, Fresnel mirrors, zone mirrors or other elements with focussing or also fading out effects.
  • the motif layer of the representation arrangement preferably lies in the focal plane of the lenses or concave mirrors.
  • the viewing elements are formed by cylindrical lenses and the support structures are formed by parallel, straight web elements, which are at an angle between 60 ° and 120 °, preferably between 85 ° and 95 °, particularly preferably of 90 ° to the axis of the cylindrical lenses extend. In this way, even with a regular arrangement of the support structures in a grid, moire effects with the viewing grid can be avoided.
  • the representation arrangement itself may in particular be a change picture, a motion picture, a morph picture or a stereo picture, but with advantage also a micro-optical display arrangement, in particular a moiré magnification arrangement, a moire-type magnification device or a modulo magnification device.
  • a micro-optical display arrangement in particular a moiré magnification arrangement, a moire-type magnification device or a modulo magnification device.
  • the motif layer of the presentation arrangement is preferably located in the focal plane of the lenses or concave mirrors.
  • the motif layer may, however, in particular in the case of non-magnifying representational arrangements, for example in the case of non-enlarging change images, also lie in a plane (parallel) which deviates slightly from the focal plane of the lenses or concave mirrors.
  • the angular ranges in which the motifs are recognizable at the same time (or in which one motif "transitions" into another) at the expense of the angular ranges in which only one of the motifs can be seen, the contrast or contrast increases However, this does not affect the sharpness of the subjects.
  • an additional structuring preferably a diffractive structure, a structure having a matting or scattering effect and / or a nanostructuring, is introduced into the depressions of the embossed structure.
  • the motif layer can be provided over the entire area or over a partial area, for example in the form of a halftone display, with at least one printing ink and / or with at least one reflective coating material, preferably a metal, a color-shifting system, a high refractive index material, metal pigments or effect pigments.
  • the invention also includes a data carrier equipped with a security element of the type described above.
  • the security element may in particular be embedded in the data carrier or applied to the data carrier.
  • the viewing elements are impressed before or after step (a) (i) into the further main surface of the first film material opposite the main surface of the first film material or into an embossable layer on the further main surface of the first film material opposite the main surface.
  • an additional structuring preferably a diffractive structure, a structure having a matting or scattering effect and / or a nanostructuring, is introduced into the recesses of the embossed structure in step (a).
  • the metal coating present in the contact region on the raised support structures of the donor film can also be transferred to the adhesive layer of the acceptor film by separating donor film and acceptor film.
  • the metal coating is applied over the entire surface or part of the area. It should be noted that the metal coating must later be partially replaced again. It must therefore not adhere too strongly to the substrate, at least less strongly than the achievable bond strength with the later to be used adhesive. A sufficiently low adhesive force may possibly already be achieved by a suitable choice of the materials for the film material or the embossable layer. Preferably, however, prior to the application of the metal coating in step (a) (ii), an adhesion-reducing treatment of the surface of the embossed structure to be coated is undertaken prior to the application of the metal coating in step (a) (ii), an adhesion-reducing treatment of the surface of the embossed structure to be coated is undertaken.
  • the motif layer after step (d1) or step (d2) is advantageously over the entire area or part of the area, for example in the form of a half-tone display, with at least one printing ink and / or provided with at least one reflective coating material, preferably a metal, a color-shifting system, a high refractive index material, metal pigments or effect pigments.
  • at least one printing ink and / or provided with at least one reflective coating material preferably a metal, a color-shifting system, a high refractive index material, metal pigments or effect pigments.
  • one or more printing inks are first applied and then additionally a reflective coating material, in particular a full-surface metallization.
  • FIG. 1 shows a schematic representation of a banknote 10, which is provided with a security element according to the invention in the form of a glued transfer element 12.
  • the transfer element 12 represents a change image which presents to the viewer different target images 14A and 14B from two different viewing directions.
  • the target images 14A, 14B each show a motif formed by visually recognizable and contrasting metallic and non-metallic portions 16A, 16B and 18A, 18B, respectively.
  • the motifs are formed by metallic glossy letters "A" and "B" in front of a monochrome, non-metallic background, the viewer viewed obliquely from the left the letter "A”, viewed obliquely from the right the letter “B "perceives.
  • the appearance of the security element alternates between the two target images 14A, 14B.
  • the motifs can also be present in particular in the form of screened half-tone representations.
  • a change picture may contain more than two reference pictures or the security element may have a motion picture, a pump picture, a morph picture or a stereo picture instead of a change picture.
  • the security element can also be designed such that the appearance does not change back and forth as described above in an "east-west tilting" of the security element between two or more target images, but in a tilting about any other axis, for example a "north-south tipping". In a north-south tilting the viewer perceives when viewed obliquely from above, for example, the letter "A" and viewed obliquely from below the letter "B" true.
  • the invention is not limited in any way to alternating images or the variants mentioned. Rather, the invention can be found in all representational arrangements with a partly metallic and partly non-metallic motif layer application.
  • the invention is also not limited to the banknote transfer elements used for illustration, but can also be used, for example, in security threads, wide security strips, or cover sheets that overlie a window area or a through opening of a document are arranged.
  • FIG. 2 schematically shows the structure of a security element 20 according to the invention, for example, the transfer element 12 of Fig. 1 in cross section. Shown here are, as in the other figures, only necessary for the explanation of the principle of operation parts of the structure.
  • the security element 20 of Fig. 2 has a carrier 22 in the form of a transparent plastic film, for example, about 20 microns thick PET film.
  • a motif layer 26 is formed, which is divided into parallel to the cylindrical lenses 24 extending narrow strips 28A, 28B with a width of 10 microns each.
  • the carrier foil 22 and the cylindrical lenses 24 are matched to one another such that the motif layer 26 is located in the focal plane of the cylindrical lenses 24.
  • the strips 28A and 28B settle for the viewer to the desired target images, such as the target images 14A, 14B of Fig. 1 together.
  • the desired desired images 14A, 14B were subdivided in a manner known per se into parallel strips 28A, 28B of the desired width and the strips thus obtained were assembled alternately with the motif layer 26.
  • the parallel strips 28A, 28B need not be the same width.
  • the strip 28A may also have a width of 5 ⁇ m and the strip 28B may have a width of 15 ⁇ m.
  • the proportion of the respective strip in the overall width has an effect on the angle range in which the desired target images 14A, 14B are visible to the viewer.
  • the security element 20 typically includes further layers 32, such as protective, masking or other functional layers, which are not essential to the present invention and therefore will not be described further.
  • Tilting or alternating pictures showing different colored subjects are known.
  • the motif parts of the target images lying in the individual strips 28A, 28B are usually printed in the desired form.
  • the peculiarity of the alternating images described here consists in the fact that the motifs of the target images 14A, 14B are formed by contrasting metallic and non-metallic subregions.
  • metallizations can not be generated directly in a motif, but only over the entire surface, for example by vapor deposition of a metal layer in a vacuum vapor deposition process.
  • Fig. 4 The procedure in the production of such a security element is in Fig. 4 illustrated.
  • a donor film 50 in the form of a transparent plastic film 22 is assumed, which is coated with a transparent embossable layer 40.
  • embossable layer 40 an embossed structure is impressed, the sequence of elevations 42 and depressions 44 is determined by the motifs of the desired target images, for example, the wells 44 represent the foreground and the surveys 42 represent the background of the respective subjects or vice versa.
  • the structure depth of the embossed structure is preferably in the range between 0.2 ⁇ m and 10 ⁇ m and the line width is preferably in the range between 0.2 ⁇ m and the width of the strips 28A, 28B, typically 5 ⁇ m to 20 ⁇ m.
  • a metal is then vapor-deposited over the entire area, so that a full-surface metal coating 48 is formed.
  • the common materials such as aluminum, silver, gold, copper, zinc, chromium and alloys thereof come into question.
  • Fig. 4 (a) shown both the elevations 42 and the recesses 44 are covered with the metal coating 48 initially.
  • an adhesion-reducing treatment of the surface to be coated is preferably carried out.
  • the thickness of the metal coating 48 depends on the desired subsequent reflection behavior and on the metal used and is for example advantageously about 30 to 50 nm for aluminum.
  • the donor sheet 50 thus produced is now filled with an in Fig. 4 (b) shown acceptor 52 brought into contact.
  • the acceptor film 52 consists of a transparent film 54, which is coated over its entire surface with a transparent adhesive layer 56 on one of its main surfaces.
  • the donor film 50 and the acceptor film 52 are pressed together, preferably under elevated pressure and elevated temperature, in order to transfer the metallization of the elevations 42 from the donor film 50 to the acceptor film 52.
  • the projections 42 of the donor sheet 50 are demetallized, while the metal coating 48 in the recesses 44 has not been transferred and therefore remains on the donor sheet 50, as in FIG Fig. 3 shown.
  • the acceptor sheet 52 after separation contains the transferred metal coating portions 58 of the bumps 42 and thus has a metallization pattern inverted compared to the donor sheet. While the generation of a change image using the donor sheet 50 is described in detail herein, an alternate image may also be made using the acceptor sheet 52.
  • a difficulty of the metal transfer method described may result from the sequence of elevations 42 and depressions 44 of the embossed structure being predetermined by the motifs of the target images, so that usually there is no regular alternating sequence of elevations and depressions, as in the schematic representation of FIGS. 3 and 4 shown. Rather, with arbitrary choice of subject, large contiguous elevation or depression areas can result, which should be demetallised in the finished security element (elevation areas) or metallized (depression areas). While large survey areas are demetallized easily with the described metal transfer process can remain troublesome in many areas of deep metalization.
  • Fig. 6 a region 60 of the motif layer 26, in which both target images 14A, 14B of the alternating image have metallized subregions.
  • these are those surface areas of the transfer element 12 in which the metallic parts of the letters "A" and "B" overlap. Since metallized picture elements are formed in the described metal transfer method by depressions of the embossed structure, the embossed pattern in this area contains recesses in both the strips 28A of the first target image and in the strips 28B of the second reference image. As a result, a large contiguous recessed area 62 can arise which, depending on the specific shape of the motifs, can have an extent of more than 100 ⁇ m or even several millimeters.
  • FIG. 6 (a) first shows an intermediate step in the production of the security element, namely the donor sheet 50 after full-surface coating of the embossed structure with metal 48, according to the situation of Fig. 4 (a) ,
  • the adhesive layer 56 of the acceptor film in the large recessed areas 62 can be pushed to the bottom of the recess, so that the acceptor film 52 is also adhesively bonded there to the metal coating 48.
  • metal is then undesirably removed from the depression area 62 as a result of the bonding, so that the in Fig. 6 (b) shown metallization error 64 arise.
  • Fig. 7 shows additional embossing structures 70 in those recessed areas 72 of the embossing layer 40, which occupy more than two strip widths 28A, 28B.
  • the support structures 70 are small raised structures, in particular webs or pillars, which, as in Fig. 7 (a) shown in the larger recessed areas 72, the Abmony the acceptor 52 to the bottom of the recess and thus prevent the unwanted transfer of metal 48 from the recesses 72 out.
  • the support structures 70 Since the metal deposited on the support structures 70 is usually also removed during parting, the support structures 70 must be designed in such a way that they can not be visually recognized when there is a lack of metallization when viewing the motif layer with the viewing grid.
  • the support structures 70 are thus fundamentally different from the non-metallized protrusions 42, which are just the non-metallized picture elements which, when viewed with the viewing grid, produce the visually recognizable non-metallic portions of the target images.
  • the visual unrecognizability of the support structures 70 is ensured by the fact that the support structures 70 occupy only 2.5% of the area of the recess 72 in which they are arranged, and that the support structures 70 also not in the grid of Microlenses 24 and the strip 28A, 28B are arranged.
  • This can be achieved, for example, by an irregular arrangement of the support structures 70, or else by a regular arrangement in a grid whose moire effects with the lenticular grid 24 remain below the resolution limit of the human eye.
  • support structures are also advantageous, the largest dimension of which extends largely perpendicular to the axis of the cylindrical lenses.
  • FIGS. 8 and 9 Some advantageous designs of inventive support structures are in the FIGS. 8 and 9 illustrated.
  • the figures show in plan view of the motif layer only a few of the support structures, as they can be arranged over the surface of a large-scale depression.
  • Support structures shown can be used both in display arrangements with cylindrical lenses as well as in display arrangements with non-cylindrical lenses, such as the above-mentioned modulo magnification arrangements.
  • the pillars 80 are small cylindrical elevations with a cross-sectional diameter of 0.7 microns to 2 microns.
  • the cross section of the buttresses 80 may also be non-circular, for example oval, triangular, rectangular or generally polygonal.
  • the simultaneous use of buttresses 80 with different cross-sections also suppresses possible moire effects.
  • a regular array is contemplated that does not produce any visible moiré effects with the viewing grid.
  • support webs 82 are narrow, non-contiguous webs with a width of 0.1 microns to 5 microns and a length of several microns. They can also be considered as supporting pillars with rectangular cross section.
  • the support structures may be further formed by irregularly extending, interconnected web structures 84 as shown at the bottom left in FIG Fig. 8 shown.
  • Another variant is the bottom right in Fig. 8 shown web elements 86, which are each composed of one or more line pieces.
  • hidden information 88 such as the "G + D" logo, can additionally be integrated into the motif layer of the security element.
  • the hidden information 88 is visually unrecognizable due to its small dimensions when viewing the motif layer without tools. With a strong magnifying glass or a microscope, the hidden information can be made visible and used to authenticate the security element.
  • Fig. 9 shown support structure designs are particularly well suited for use with cylindrical lenses whose axis is parallel to the direction 90.
  • the parallel webs 92 have a width of 0.1 to 5 .mu.m to each other at a distance of 10 to 30 microns.
  • the webs 92 extend perpendicular to the axis 90 of the cylindrical lenses and thus in a division of the motif layer in parallel strips 28A, 28B ( Fig. 2 ) also perpendicular to the strip extension.
  • concealed information 94 may be included in the parallel lands, such as the logo "G + D" shown, which, due to its small size, is not visually recognizable without aids, but can be visualized with a strong magnifying glass or microscope for authentication ,
  • short supporting webs 96 are provided as support structures, all of which run perpendicular to the axis 90 of the cylindrical lenses, and whose position varies irregularly, as in the lower half of FIG Fig. 9 shown.
  • the height of the support structures preferably corresponds to the depth of the recesses, but it may also be chosen smaller or larger. It is only essential that they prevent the adhesive layer of the acceptor film from being pressed through to the bottom of the recesses in the laminating process.
  • the foregoing is not intended to be construed as limiting the invention in any way to alternate images. Rather, the invention is generally applicable to display arrangements with a viewing element grid, in particular a lenticular grid.
  • Fig. 10 an embodiment of a security element 100 with a representation arrangement in the form of a modulo magnification arrangement.
  • a UV embossing lacquer is applied to a carrier 102, which is formed by a transparent PET film 19 ⁇ m thick, into which a parallelogram grid of spherical microlenses 104 having a diameter of approximately 20 ⁇ m is embossed.
  • a motif layer 106 having an embossed structure 108 is arranged, whose non-metallized elevations 118 and metallized depressions 120 represent the imaged areas of a predetermined reference image. How the imaged areas of a modulo magnification arrangement can be determined from a predetermined target image is described in the publication WO 2009/000528 A1 described in detail. The relevant disclosure of the WO 2009/000528 A1 is included in the present description.
  • the depressions 120 of adjacent imaged regions can be supplemented to form an extended depression region 110.
  • those depression regions 110 whose dimension exceeds 30 ⁇ m in one spatial direction are provided with support structures 92 in the form of cylindrical pillars (FIG. Fig. 8 ) Mistake.
  • the support structures 92 have in the embodiment of Fig. 10 Each has a diameter of 1.5 microns and are distributed in an area ratio of about 3% irregularly in the recessed areas 110. During the laminating process, the support structures 92 reliably prevent the adhesive layer 56 of the acceptor foil 52 from escaping to the bottom of the depression regions 110.
  • the motif layer 106 formed after lamination and release winding was provided with a full-surface ink layer 112 and a full-surface metallization 114.
  • Reference numeral 116 denotes further layers of the structure of the security element, for example primer, opaque white or heat-sealable layers.
  • the support structures 92 and / or the lack of metallization at the location of the support structures in the recessed areas 110 are not visually discernible when viewed with the grid of spherical microlenses.
  • the embossing structure of the donor film 20 in the depressions may additionally be provided with a further, finer structuring.
  • a structuring is formed, for example, by diffractive microrelief structures carrying holographic information or hologram gratings for producing black structures.
  • other structures such as structures with matting or scattering effect or reflective microrelief structures are possible.
  • sub-wavelength gratings or nanostructures in particular moth-eye structures.
  • additional stylishness (subwavelength lattice) or a blackening (moth-eye structures) are generated.
  • different additional structuring may be provided in each of the recesses of the regions of the embossed structure assigned to different desired images or in the depressions of different subregions of the embossed structure assigned to a desired image.

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Claims (19)

  1. Elément de sécurité (100) pour sécuriser des papiers de sécurité, des documents de valeur et d'autres supports de données, avec un système de représentation pour représenter une ou plusieurs images de consigne (14A, 14B) dont les motifs sont respectivement formés par des zones partielles contrastées métalliques (16A, 16B) et non métalliques (18A, 18B) reconnaissables visuellement,
    dans lequel le système de représentation comprend une couche à motifs (106) avec une pluralité d'éléments d'image métallisés et d'éléments d'image non métallisés et une trame d'observation, espacée par rapport à la couche à motifs, en une pluralité d'éléments d'observation (104), et les éléments d'image métallisé et les éléments d'image non métallisés générant, lors de l'observation avec la trame d'observation, les zones partielles contrastées métallisées et non métallisées, reconnaissables visuellement avec la trame d'observation, des images de consigne (14A, 14B),
    dans lequel la couche à motifs (106) comprend une structure d'estampage avec des bosses (118) et des creux (110, 120), dans lequel les éléments d'image non métallisés de la couche à motifs sont formés par des bosses non métallisées (118) de la structure d'estampage et les éléments d'image métallisés étant formés par des creux (110, 120) sensiblement métallisés de la structure d'estampage,
    caractérisé en ce que
    au moins une partie des creux sensiblement métallisés (110) contient, dans une fraction de surface comprise entre 0,1% et 25%, de petites structures d'appui (92) en relief qui ne sont pas reconnaissables visuellement lors de l'observation avec la trame d'observation.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce qu'au moins une partie des creux sensiblement métallisés contiennent les structures d'appui dans une fraction de surface comprise entre 2,5% et 10%.
  3. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les structures d'appui sont irrégulièrement réparties dans les creux.
  4. Elément de sécurité selon l'une au moins des revendications 1 à 3, caractérisé en ce que la hauteur des structures d'appui correspond à la profondeur des creux dans lesquels elles sont disposées.
  5. Elément de sécurité selon l'une au moins des revendications 1 à 4, caractérisé en ce que les structures d'appui comprennent des supports avec une section transversale de forme circulaire, ovale, triangulaire, rectangulaire ou polygonale, pour lesquelles la section transversale des supports présente de préférence une surface comprise entre 0,25 µm2 et 25 µm2.
  6. Elément de sécurité selon l'une au moins des revendications 1 à 5, caractérisé en ce que les structures d'appui comprennent des structures d'entretoises reliées s'étendant irrégulièrement, pour lesquelles la largeur des structures d'entretoise est de préférence comprise entre 0,1 µm et 5 µm.
  7. Elément de sécurité selon l'une au moins des revendications 1 à 6, caractérisé en ce que les structures d'appui comprennent des éléments d'entretoise non reliés qui se composent respectivement d'une ou plusieurs pièces linéaires et dont la largeur est de préférence comprise entre 0,1 µm et 5 µm.
  8. Elément de sécurité selon l'une au moins des revendications 1 à 7, caractérisé en ce que les structures d'appui comprennent des éléments d'entretoise rectilignes parallèles dont la largeur est de préférence comprise entre 0,1 µm et 5 µm.
  9. Elément de sécurité selon l'une au moins des revendications 1 à 8, caractérisé en ce que les structures d'appui contiennent, dans une zone partielle, une information cachée sous la forme de symboles ou d'un codage.
  10. Elément de sécurité selon l'une au moins des revendications 1 à 9, caractérisé en ce que les éléments d'observation sont formés par des lentilles sphériques, des lentilles asphériques, des lentilles cylindriques ou des micro-miroirs concaves de focalisation unidimensionnels ou bidimensionnels, ou bien en ce que les éléments d'observation sont formés par des lentilles cylindriques et en ce que les structures d'appui sont formées par des éléments d'entretoise rectilignes parallèles qui s'étendent selon un angle compris entre 60° et 120°, de préférence entre 85° et 95°, de manière particulièrement préférée, de 90°, par rapport à l'axe des lentilles cylindriques.
  11. Elément de sécurité selon l'une au moins des revendications 1 à 10, caractérisé en ce que le système de représentation est une image changeante, une image animée, une image de pompage, une image de morphing ou une image stéréo, ou bien en ce que le système de représentation est un système de représentation micro-optique, en particulier un système d'agrandissement de moirage, un système d'agrandissement de type moiré ou un système d'agrandissement modulo.
  12. Elément de sécurité selon l'une au moins des revendications 1 à 11, caractérisé en ce que, dans les creux de la structure d'estampage, une structuration supplémentaire, de préférence une structure diffractive, une structure avec un effet de matage ou de diffusion et/ou une nano-structuration est intégrée.
  13. Elément de sécurité selon l'une au moins des revendications 1 à 12, caractérisé en ce que la couche à motifs est dotée, sur toute la surface ou sur une surface partielle, d'au moins une couleur d'impression et/ou d'au moins une matière de revêtement réfléchissante, de préférence un métal, un système de changement de couleur, une matière à indice de réfraction élevé, des pigments métalliques ou des pigments à effet.
  14. Support de données avec un élément de sécurité selon l'une des revendications 1 à 13.
  15. Procédé pour la fabrication d'un élément de sécurité avec un système de représentation pour la représentation d'une ou plusieurs images de consigne dont les motifs sont respectivement formés par des zones partielles contrastées métalliques ou non métalliques reconnaissables visuellement, avec les étapes suivantes du procédé :
    (a) fabrication d'une feuille de donneur (50) par
    (i) formation d'une structure d'estampage avec des bosses et des creux et avec des structures d'appui en relief disposées dans les creux dans une fraction de surface comprise entre 0,1% et 25%, au moins dans une zone partielle d'une surface principale d'un premier matériau en feuille ou dans une couche estampable sur au moins une zone partielle d'une surface principale d'un premier matériau en feuille,
    dans lequel les bosses et les creux génèrent des éléments d'image d'une couche à motifs du système de représentation lesquels, lors de l'observation de la couche à motifs avec une trame d'observation du système de représentation, génèrent des zones partielles contrastées métalliques et non métalliques, reconnaissables visuellement avec une trame d'observation du système de représentation, des images de consigne,
    (ii) application d'un revêtement métallique (48) sur au moins une zone partielle de la structure d'estampage,
    (b) la fabrication d'une feuille d'accepteur (52) par application d'une couche d'adhésif (56) sur au moins une zone partielle d'une surface principale d'un deuxième matériau en feuille,
    (c) le contre-collage de la feuille de donneur et de la feuille d'accepteur au moyen de la couche d'adhésif de manière à ce qu'au moins une zone partielle de la structure d'estampage revêtue et une zone partielle de la couche d'adhésif arrivent en contact l'une avec l'autre, dans lequel, dans la zone de contact, le revêtement métallique sur les bosses de la structure d'estampage est collé avec la couche d'adhésif de la feuille d'accepteur,
    (d1) le transfert de la couche métallique, existant dans la zone de contact sur les bosses de la feuille de donneur, sur la couche d'adhésif de la feuille d'accepteur en séparant la feuille de donneur et la feuille d'accepteur, moyennant quoi une couche à motifs avec une pluralité d'éléments d'image métallisés et d'éléments d'image non métallisés est formée à partir de la couche de donneur, et
    (e1) la fabrication d'un système de représentation en combinant la couche à motifs de la feuille de donneur avec une trame d'observation en une pluralité d'éléments d'observation de manière à ce que les éléments d'image métallisés et les éléments d'image non métallisés génèrent, lors de l'observation avec la trame d'observation, les zones partielles contrastées métalliques et non métalliques reconnaissables visuellement des images de consigne.
  16. Procédé selon la revendication 15, caractérisé en ce qu'à l'étape (a), on intègre dans les creux de la structure d'estampage une structuration supplémentaire, de préférence une structure diffractive, une structure avec un effet de matage ou de diffusion et/ou une nano-structuration.
  17. Procédé pour la fabrication d'un élément de sécurité avec un système de représentation pour la représentation d'une ou plusieurs images de consigne dont les motifs sont respectivement formés par des zones partielles contrastées métalliques ou non métalliques reconnaissables visuellement, avec les étapes suivantes du procédé :
    (a) la fabrication d'une feuille de donneur (50) par
    (i) formation d'une structure d'estampage avec des bosses et des creux et avec des structures d'appui en relief disposées dans les creux dans une fraction de surface comprise entre 0,1% et 25%, au moins dans une zone partielle d'une surface principale d'un premier matériau en feuille ou dans une couche estampable sur au moins une zone partielle d'une surface principale d'un premier matériau en feuille,
    dans lequel les bosses et les creux génèrent des éléments d'image d'une couche à motifs du système de représentation lesquels, lors de l'observation de la couche à motifs avec une trame d'observation du système de représentation, génèrent des zones partielles contrastées métalliques et non métalliques, reconnaissables visuellement avec une trame d'observation du système de représentation, des images de consigne,
    (ii) application d'un revêtement métallique (48) sur au moins une zone partielle de la structure d'estampage,
    (b) la fabrication d'une feuille d'accepteur (52) en appliquant une couche d'adhésif (56) sur au moins une zone partielle d'une surface principale d'un deuxième matériau en feuille,
    (c) le contre-collage de la feuille de donneur et de la feuille d'accepteur au moyen de la couche d'adhésif de manière à ce qu'au moins une zone partielle de la structure d'estampage revêtue et une zone partielle de la couche d'adhésif arrivent en contact l'une avec l'autre, dans lequel, dans la zone de contact, le revêtement métallique sur les bosses de la structure d'estampage est collé avec la couche d'adhésif de la feuille d'accepteur,
    (d2) le transfert de la couche métallique, existant dans la zone de contact sur les bosses de la feuille de donneur, sur la couche d'adhésif de la feuille d'accepteur en séparant la feuille de donneur et la feuille d'accepteur, moyennant quoi une couche à motifs avec une pluralité d'éléments d'image métallisés et d'éléments d'image non métallisés est formée à partir de la couche d'accepteur, et
    (e2) la fabrication d'un système de représentation en combinant la couche à motifs de la feuille d'accepteur avec une trame d'observation en une pluralité d'éléments d'observation de manière à ce que les éléments d'image métallisés et les éléments d'image non métallisés génèrent, lors de l'observation avec la trame d'observation, les zones partielles contrastées métalliques et non métalliques reconnaissables visuellement des images de consigne.
  18. Procédé selon l'une au moins des revendications 15 à 17, caractérisé en ce qu'à l'étape (d1) ou à l'étape (d2) on transfère également le revêtement métallique, existant dans la zone de contact sur les structures d'appui en relief de la feuille de donneur, sur la couche d'adhésif de la feuille d'accepteur en séparant la feuille de donneur et la feuille d'accepteur.
  19. Procédé selon l'une au moins des revendications 15 à 18, caractérisé en ce qu'avant l'étape (a)(ii), dans au moins une zone partielle de la structure d'estampage, on procède à un traitement réduisant l'adhérence de la structure d'estampage et/ou en ce qu'après l'étape (d1) ou après l'étape (d2), la couche à motifs est dotée, sur toute la surface ou sur une surface partielle, d'au moins une couleur d'impression et/ou d'au moins une matière de revêtement réfléchissante, de préférence un métal, un système à effet de changement de couleur, une matière à indice de réfraction élevé, des pigments métalliques ou des pigments à effet.
EP13770637.0A 2012-09-24 2013-09-20 Élément de sécurité à système de visualisation Active EP2897812B1 (fr)

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DE102012018774.2A DE102012018774A1 (de) 2012-09-24 2012-09-24 Sicherheitselement mit Darstellungsanordnung
PCT/EP2013/002845 WO2014044402A1 (fr) 2012-09-24 2013-09-20 Élément de sécurité à système de visualisation

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DE102014011425A1 (de) 2014-07-31 2016-02-04 Giesecke & Devrient Gmbh Sicherheitselement zur Herstellung von Wertdokumenten
WO2016065331A2 (fr) 2014-10-24 2016-04-28 Wavefront Technology, Inc. Produits optiques, gabarits pour la fabrication de produits optiques, et procédés de fabrication de gabarits et de produits optiques
DE102015008655A1 (de) 2015-07-03 2017-01-05 Giesecke & Devrient Gmbh Sicherheitselement mit farbfilterndem Gitter
EP3795367A1 (fr) 2015-07-13 2021-03-24 Wavefront Technology, Inc. Produits optiques
DE102015009584A1 (de) 2015-07-23 2017-02-09 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu dessen Herstellung
DE102015010945A1 (de) 2015-08-19 2017-02-23 Giesecke & Devrient Gmbh Wertdokument
DE102016203609A1 (de) 2016-03-04 2017-09-07 Bundesdruckerei Gmbh Sicherheitsgegenstand mit dynamischem und statischem Fenstersicherheitsmerkmal und Verfahren zur Herstellung
WO2017184581A1 (fr) 2016-04-22 2017-10-26 Wavefront Technology, Inc. Dispositifs de commutation optique
WO2019077419A1 (fr) 2017-10-20 2019-04-25 Wavefront Technology, Inc. Dispositifs commutateurs optiques
WO2020214239A1 (fr) 2019-04-19 2020-10-22 Wavefront Technology, Inc. Dispositifs commutateurs optiques

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DK1893074T3 (da) * 2005-05-18 2013-11-04 Visual Physics Llc Billedvisning og mikrooptisk sikkerhedssystem
DE102007029203A1 (de) 2007-06-25 2009-01-08 Giesecke & Devrient Gmbh Sicherheitselement
DE102010019766A1 (de) * 2010-05-07 2011-11-10 Giesecke & Devrient Gmbh Verfahren zur Erzeugung einer Mikrostruktur auf einem Träger

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