EP3823839A1 - Élément de sécurité doté d'une image lenticulaire - Google Patents

Élément de sécurité doté d'une image lenticulaire

Info

Publication number
EP3823839A1
EP3823839A1 EP19742127.4A EP19742127A EP3823839A1 EP 3823839 A1 EP3823839 A1 EP 3823839A1 EP 19742127 A EP19742127 A EP 19742127A EP 3823839 A1 EP3823839 A1 EP 3823839A1
Authority
EP
European Patent Office
Prior art keywords
layer
motif
radiation
security element
sensitive
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.)
Pending
Application number
EP19742127.4A
Other languages
German (de)
English (en)
Inventor
Veronika RACK
André Gregarek
Annett Bähr
Josef Schinabeck
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 Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3823839A1 publication Critical patent/EP3823839A1/fr
Pending legal-status Critical Current

Links

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
    • B42D25/20—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
    • B42D25/324—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
    • B42D25/30—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
    • B42D25/36—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
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser

Definitions

  • the invention relates to a security element for securing security papers, documents of value and other data carriers, with a lenticular image which contains a lenticular screen made up of a plurality of microlenses and a radiation-sensitive motive layer spaced apart from the lenticular screen, the radiation-sensitive motif layer at least in one Motif area contains a plurality of transparency areas generated by the action of radiation, in which the radiation-sensitive motif layer is removed.
  • Data carriers such as documents of value or identity documents, but also other objects of value, such as branded goods, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing angle-dependent effects play a special role in ensuring authenticity, since these cannot be reproduced even with the most modern copying machines.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and / or a different graphic motif depending on the viewing angle.
  • the data carriers with laser-engraved tilt images for protection.
  • Two or more different labels for example a serial number and an expiry date, are arranged at different angles by an arrangement.
  • Lindric lenses laser engraved on the disk. The laser radiation creates a local blackening of the data carrier body, which makes the engraved markings visually visible. Depending on the viewing angle, only the identification drawing engraved from this direction is visible when viewed, so that a tilting of the data carrier perpendicular to the axis of the cylindrical lenses creates an optically variable tilting effect.
  • micro images can be printed or embossed, for example, without the aid of the lenticular grid.
  • These production variants are usually very inexpensive, but it is usually not possible with the very thin layer structures that are important in security printing to arrange the microimages so precisely with the lenticular grid that the different representations always appear at the same angle, that is For example, when viewing several banknotes with the same tilt image next to each other, all banknotes show the same display from a certain angle.
  • the object of the invention is to provide a security element of the type mentioned at the outset which has a visually attractive appearance and is easy to manufacture.
  • a security element comprises a lenticular image which contains a lenticular screen made up of a plurality of microlenses and a radiation-sensitive motif layer arranged at a distance from the lenticular screen.
  • the radiation-sensitive motif layer contains at least one mo- tiv Scheme a plurality of transparency areas generated by the action of radiation, in which the radiation-sensitive motif layer is removed.
  • the radiation-sensitive motif layer has a color sublayer and a metal sublayer at least in the motif area.
  • the metal sublayer is a printed metal pigment layer whose absorption property is matched to the absorption property of the color sublayer.
  • a printed metal pigment layer offers the advantage of being easier to manufacture. This means that a metallization machine cycle can be completely saved, since the metal pigment layer can be printed together with the color sublayer in one operation.
  • the metal pigment layer also creates an advantageous metallic impression and also significantly increases the opacity of the colors of the color sublayer. The inventors have found that the colors of the color sublayer with a printed metal pigment layer appear as a background with a richer and more striking appearance than when using an aluminum background layer and that they also appear less darkened.
  • the aforementioned adaptation of the absorption properties of the color sublayer and the printed metal pigment layer has the consequence that the two sublayers can be removed together by the action of radiation, in particular by laser exposure, due to the mutually adapted absorption properties.
  • the adaptation of the absorption properties can be carried out with particular advantage via the choice of the binder of the metal pigment layer and / or the partial color layer, or by adding absorbers at the wavelength of the ablation radiation. adsorbers.
  • the absorbers can advantageously be visually transparent or at least only lead to a darkening of the metal pigment layer and / or the partial color layer without changing their color tone.
  • the printed metal pigment layer When viewed from the lenticular grid, the printed metal pigment layer expediently lies behind the color sublayer and therefore forms a background layer for the color sublayer from the viewing direction.
  • the radiation-sensitive motif layer can in principle also have three or more sub-layers, it is provided in an advantageous embodiment that the radiation-sensitive motif layer consists only of the two sub-layers mentioned, namely the color sub-layer and the metal sub-layer.
  • the printed metal pigment layer is particularly advantageously a printed silver color, such as Lumogen OVD Ink 102 from BASF or SSF 014 silver from Rotoflex.
  • the printed metal pigment layer advantageously forms an opacity-increasing background for the color sublayer.
  • the removal thresholds of the printed metal pigment layer and the partial color layer for exposure to radiation are advantageously within 50%, preferably within 30%, particularly preferably within 20%. More precisely, the smaller of the two removal thresholds is within 50% (or 30% or 20%) of the larger removal threshold. So if the color sublayer requires a laser power density of at least LF for ablation and the metal sublayer requires a laser power density of at least LM, SO the condition mentioned requires that min (LF LM) in the range of 0.5 * max (L F L M ) to max (L F, L M ), and in the preferred configurations in the range of
  • the absorption properties of the printed metal pigment layer and the color sublayer in the near-infrared spectral range are matched to one another, in particular the absorptions of the printed metal pigment layer and the color sublayer for radiation in the near-infrared spectral range are within 50%, preferably within 30% %, particularly preferably within 20%. More specifically, the smaller of the two absorptions is within 50% (or 30% or 20%) of the larger absorption.
  • SO is min (AF, AM) in the range of 0.5 * max (A F, A M) to max (AF, A M ), and in the preferred designs in the range of
  • the printed metal pigment layer and / or the color sublayer are advantageously mixed with an absorber additive — adapted to the spectral range of the laser used in each case, in particular with an absorber additive that is transparent in the visual spectral range.
  • an absorber can also be used which only darkens the metal pigment layer or the partial color layer without changing its color.
  • the absorber additive is preferably an infrared absorber additive or a laser absorber additive.
  • the laser absorber additive acts transparently in the visual spectral range, but selectively absorbs a laser wavelength.
  • the infrared absorber additive is absorbent in the IR range and optionally transparent in the visual.
  • the ink sublayer is advantageously a printing layer, preferably with an ink layer thickness between 0.5 and 10 g / m 2 , in particular between 1 and 2 g / m 2 .
  • the color sublayer can be, for example, a layer made of midi blue, heliogen green, or dioxazine violet, but also a colored metallic layer, such as a copper or gold layer.
  • the printed metal pigment layer advantageously has a color layer thickness between 0.5 and 10 g / m 2 , in particular between 2.5 and 5 g / m 2 .
  • the lenticular image shows at least two different appearances from different viewing directions, the transparency areas being arranged in register with the microlenses of the lenticular screen, and the radiation-sensitive motif layer outside the transparency areas generated by the radiation effect is opaque and is structured in the motif area in the form of a first motif, so that the first motif is visible as the first appearance when the security element is viewed from a first viewing direction through the lenticular screen.
  • the radiation-sensitive motif layer is laser-sensitive and is ablated in particular by laser radiation.
  • the refractive effect of the microlenses of the lenticular grid defines a focal plane, the radiation-sensitive motif layer advantageously being arranged essentially in this focal plane.
  • the motif layer must be used are not exactly in the focal plane, but in some designs can be up to half a focal length above or below the focal plane.
  • Such a defocused arrangement of the motif layer can be particularly advantageous if a particularly small thickness of the security element is to be achieved or if a particularly large area under the respective microlenses is to be made transparent.
  • the motif layer By arranging the motif layer outside the focal plane, the viewing angles from which the appearances are visible can also be influenced and in particular enlarged. A large viewing angle range represents a particularly desirable product property of the security elements described.
  • the lenticular array has or represents a one-dimensional arrangement of microlenses, in particular of cylindrical lenses. It can also advantageously be provided that the lenticular screen has or represents a two-dimensional arrangement of microlenses, in particular spherical or aspherical lenses.
  • microlenses lenses are referred to as microlenses, the size of which lies in at least one lateral direction below the resolution limit of the naked eye.
  • the microlenses can in particular be cylindrical, but the use of spherical or aspherical lenses can also be considered.
  • the latter preferably have a diameter between 5 pm and 300 pm, in particular between 10 gm and 50 pm, particularly preferably between 15 gm and 20 pm.
  • Micro-cylindrical lenses preferably have a width between 5 pm and 300 pm, in particular between 10 pm and 50 pm, particularly preferably between 15 pm and 20 pm.
  • the length of the micro-cylindrical lenses is arbitrary, it can For example, when used in security threads or transfer elements, they also correspond to the total width of the thread or transfer element and are several millimeters or several centimeters.
  • a second motif layer which is structured in the form of a second motif, is arranged on the side of the radiation-sensitive motif layer facing away from the lenticular grid, so that the second motif when the security element is viewed from a second viewing direction the lenticular grid and the transparency areas of the radiation-sensitive motif layer are visible as a second appearance.
  • the second motif layer can in particular be formed by a printing layer.
  • the second motif layer can be formed over the entire surface, but can also be only partially present, and the security element can then be used to identify an underlying surface beneath the security element outside the second motif layer.
  • one or more transparent layers are arranged on the side of the radiation-sensitive motif layer facing away from the lenticular grid, so that when the security element is viewed from a second viewing direction through the lenticular grid and the transparency areas of the radiation-sensitive motif layer, one below the security element lying surface is visible as a second appearance.
  • the invention also includes a data carrier, in particular a value document, a security paper, an identification card, a branded article or the like, with a security element of the type described.
  • a data carrier can in particular contain a security element without a second motif layer, in which, in the manner described above, one or more transparent layers are arranged on the side of the radiation-sensitive motif layer facing away from the lenticular screen.
  • the data carrier is provided in a partial area with a second motif layer, which is structured in the form of a second motif.
  • the security element is then arranged with the lens grid and the transparency areas above the second motif layer, so that the second motif is visible as a second appearance when the security element is viewed from a second viewing direction through the lens grid and the transparency areas of the radiation-sensitive motif layer.
  • first motif general, generic motif
  • second motif individualized motif
  • the invention also includes a method for producing a security element with a lenticular image, in which a carrier substrate is provided and provided with a lenticular screen made up of a plurality of microlenses and a radiation-sensitive motif layer spaced apart from the lenticular screen, at least in the radiation-sensitive motif layer a plurality of transparency areas are generated in a motif area by the action of radiation through the lenticular screen, in which the radiation-sensitive motif layer is removed,
  • the radiation-sensitive motif layer is formed at least in one motif area with a color sub-layer and a metal sub-layer, a metal pigment layer being selected as the metal sub-layer, the absorption property of which is matched to the absorption property of the color sub-layer, and the selected metal pigment layer is printed on as a metal partial layer of the radiation-sensitive motif layer.
  • the lenticular image shows at least two different appearances from different viewing directions
  • the transparency regions in the radiation-sensitive motif layer being produced in register with the microlenses of the lenticular grid, and the radiation-sensitive motif layer outside the one produced by radiation Transparency areas are designed to be opaque and structured in the form of a first motif so that the first motif is visible as the first appearance when the security element is viewed from a first viewing direction through the lenticular screen.
  • the radiation-sensitive layer is exposed to laser radiation through the lenticular grid in order to generate the transparency regions.
  • the radiation-sensitive motif layer is advantageously ablated by the laser radiation.
  • IR or NIR lasers (NIR: wavelength 0.78-3 gm), in particular lasers in the IR-A range (wavelength 0.78-1.4 gm), for example at a wavelength of approximately 1064, are advantageously used as laser sources nm, or for example also green lasers are used, the radiation of which can be obtained, for example, by frequency doubling of the NIR lasers.
  • NIR NIR: wavelength 0.78-3 gm
  • lasers in the IR-A range for example at a wavelength of approximately 1064
  • green lasers are advantageously used as laser sources nm, or for example also green lasers are used, the radiation of which can be obtained, for example, by frequency doubling of the NIR lasers.
  • the following parameters are suitable for ablation, for example:
  • - Power 0.1-100%, preferably 70-85% with a 3.5 W laser
  • a security element according to the invention can also contain more than two representations which are visible from more than two different viewing directions.
  • FIG. 1 shows a schematic representation of a banknote with a security element according to the invention, which contains a tilt image with two different appearances
  • Fig. 2 shows schematically the layer structure of the security element of the
  • Fig. 3 is a plan view of the security element of FIG. 2 without that
  • FIGS. 4 to 7 show the manufacture of the security element of FIGS. 2 and 3, with (a) an intermediate step in the manufacture of the security element and (b) the appearance of the respective intermediate product in supervision without the lens grid and thus without the focusing effect of the microlenses shows, and
  • FIG. 8 schematically shows a security element according to the invention, in which the second motif layer has been dispensed with.
  • FIG. 1 shows a schematic illustration of a bank note 10 which is provided with a security element 12 according to the invention in the form of a transfer element glued on.
  • the security element 12 represents a tilt image which, depending on the viewing direction, shows one of two different appearances 14A, 14B.
  • the invention is not limited to the transfer elements for banknotes shown for illustration, but can also be used, for example, for security threads, wide security strips or cover foils which are arranged over an opaque area, a window area or a continuous opening of a data carrier.
  • the two appearances in the exemplary embodiment are represented by a two-color representation 14A of the value number "50" and a representation 14B of two colored rectangles, but it is understood that the appearances in practice typically represent more complex motifs, such as geometric patterns, portraits, coding, numbering, architectural, technical or natural motifs , When the banknote 10 is tilted 16 or the direction of viewing is changed accordingly, the appearance of the security element 12 alternates between the two appearances 14A, 14B.
  • the present invention provides a specially designed lenticular image in which the motifs shown are incorporated into the motif layer of the lenticular image in a particularly simple yet highly precise manner.
  • a mask for an exposure using a laser nor a fine scanning of the motif layer with a sharply focused laser beam or a multiple laser exposure from different directions is required.
  • FIG. 2 shows schematically the layer structure of the security element 12 according to the invention in cross section, only the parts of the layer structure required for the explanation of the functional principle are shown.
  • FIG. 3 shows a top view of the security element 12 without the lens grid and thus without the focusing effect of the microlenses.
  • FIGS. 2 and 3 show the finished security element 12, but in particular the detailed description of the production of the security element with reference to FIGS. 4 to 7 is helpful for understanding the complex layer structure and the interaction of the individual layers.
  • the security element 12 contains a carrier substrate 22 in the form of a transparent plastic film, for example an approximately 20 pm thick polyethylene terephthalate (PET) film.
  • PET polyethylene terephthalate
  • the carrier substrate 22 has opposite first and second main surfaces, the first main surface being provided with a lenticular grid 24 made up of a plurality of essentially cylindrical microlenses 26.
  • the thickness of the carrier substrate 22 and the curvature of the focusing lens surfaces of the microlenses 26 are matched to one another in such a way that the focal length of the microlenses 26 essentially corresponds to the thickness of the carrier substrate 22.
  • the focal plane of the microlenses 26 then essentially coincides with the second, opposite main surface of the carrier substrate 22. As explained above, in some configurations, however, it can also make sense not to let the focal plane coincide with the second main surface of the carrier substrate, for example in order to produce particularly thin security elements.
  • a laser-sensitive motif layer 30 is arranged on the second main surface of the carrier substrate 22 and, in the exemplary embodiment shown, consists of two sub-layers, namely a color sub-layer 32 and a metal sub-layer 34 in the form of a printed metal pigment layer.
  • the partial color layer 32 in the exemplary embodiment is formed by a printed blue-blue color layer and the metal pigment layer by a silver pigment layer, for example Lumogen OVD Ink 102 from BASF.
  • the Milori blue ink layer is printed, for example, with a basis weight of 1.5 g / m 2 , the silver pigment ink with a basis weight of 3.5 g / m 2 .
  • the motif layer 30 also contains a plurality of parallel, line-shaped transparency areas in the form of line-shaped cutouts 40, which were produced in the manner described in more detail below for the micro lenses 26 of the lens grid 24.
  • the areas of the motif layer 30 between the cutouts 40 form left-over material areas 42, which are also linear and are designed to fit the microlenses 26.
  • the linear cutouts 40 and the linear material areas 42 have the same width, but in general the cutouts and the material areas can also be of different widths.
  • the motif layer 30 is opaque and structured in the form of a first motif, in the exemplary embodiment in the form of the value "50".
  • the color sublayer 32 represents the number "50” with a blue appearance
  • the metal pigment layer 34 forms a well contrasting, metallic silvery background for the value number "50”.
  • the metal pigment layer 34 increases the opacity of the color layer 32.
  • the blue color of the Milori blue layer thus appears saturated and striking when viewed through the lenticular screen 24, but at the same time less darkened than with a conventional vapor-deposited aluminum background layer.
  • the viewer looks at the cutouts 40 in the motif layer 30 due to the focusing effect of the microlenses 26, so that the motif layer 30 is not visible from this viewing direction and the perceived appearance of the further configuration of the security element in FIG the recesses 40 depends.
  • a second motif layer in the form of a printing layer 60 on the side of the motif layer 30 facing away from the lens grid 24, which is structured in the form of a second motif.
  • a simple motif from two differently colored rectangles 62, 64 is shown for illustration, but it is understood that any complex motifs can be created here if desired.
  • the viewer When viewed from the second viewing direction 52, the viewer thus looks through the cutouts of the first motif layer 30 onto the second motif layer 60 and therefore perceives the two colored rectangles 62, 64 as appearance 14B.
  • the security element 12 typically contains further layers 66, such as protective, cover or additional functional layers, which, however, are not essential in the present case and are therefore not described in detail.
  • One or more of the further layers 66 can be opaque and form a background for the representation of the second motif layer 60, or the further layers can be transparent or translucent and, in the case of a second motif layer that is not full-area, allow a view through the security element 12 in some areas.
  • the second motif layer 60 can be full-surface or, as in the exemplary embodiment in FIGS. 2 and 3, itself only partially present and therefore in the areas lying outside the motif layer 60 allow a view of an underlying layer lying below the security element 12.
  • the base layer can be formed, for example, by the substrate of the bank note 10 (indicated by dashed lines in FIG.
  • the background layer can be single-colored or structured itself and can contain, for example, information which can be seen in the cutouts 40 from the viewing direction 52.
  • the security element 12 can also be present in a window area of a data carrier, so that the transparent areas lying outside the motif layer 60 represent viewing areas in the security element 12.
  • PET polyethylene terephthalate
  • a metal pigment layer 34 is then printed over the entire surface of the structured color partial layer 32 as the second partial layer, as shown in FIG. 5 (a). It is important here that the visual appearance of the metal pigment layer 34 differs significantly from that of the color partial layer 32, so that a good contrast is produced when viewed.
  • Milori blue layer it is also possible, for example, to print a layer made of heliogen green or dioxazine violet or a layer made of a different colored metal, such as copper or gold, or a color-contrasting alloy.
  • a multi-layer system for example a thin-film interference layer system with reflector, the dielectric spacer layer and absorber, which shows different colors depending on the direction, can also be used.
  • the motif layer 30 lies with the blue after this method step
  • the surface of the motif layer 30 is exposed to laser radiation 70 over a large area through the lens grid 24, as shown in FIG. 6 (a).
  • the Laserstrah lung 70 is focused by the cylindrical microlenses 26 linearly on layer which is arranged on the second main surface of the carrier 22 S ubstrats image 30 and ablated where the metal sub-layer 34 and in the loading range of the value "50", both sub-layers 32, 34, so that linear cutouts 40 are created in the motif layer 30.
  • the paint particles of the partial paint layer and the partial metal layer should be easy to remove. The film therefore does not lie on a substrate with the layers to be ablated, but is lasered "in the balance".
  • the motif layer 30 with the blue value number “50” (reference number 32) and the metallic silvery background 34 is only present in the left-over material areas 42.
  • the laser exposure created transparency areas 40 between the material areas 42 in which the intermediate product is transparent.
  • the security element 12 can already be delivered to the final production after this method step and can be provided, for example, with a transparent protective layer on the second main surface, as described in more detail below in connection with FIG. 8.
  • a second motif layer 60 which is structured in the form of a second motif with two colored rectangles 62, 64, is printed on the first motif layer 30 provided with cutouts 40.
  • the security element now has, as shown in FIG. 7 (b), two structured motif layers 30 and 60, the motifs of which are each visible from the viewing directions 50, 52 (FIG. 2). As far as visible when viewing, both motifs are also in register with the micro lenses 26 of the lenticular grid 24, although only a single laser exposure step was required for their generation.
  • the second motif layer 60 was dispensed with and there were at most transparent layers, for example a transparent protective or covering layer and / or a transparent adhesive layer is applied to the first motif layer 30.
  • the security element 80 created in this way shows the first motif already described above, formed by the first motif layer 30, when viewed from a first viewing direction and, from a second viewing direction in the recesses 40 of the first motif layer 30, allows a view of an underlying layer ,
  • the security element 80 may be intended for use with identification documents 82 and, with its motif layer 30 as the first, generic motif, show a national coat of arms. Since the security element 80 itself only shows the generic motif "national coat of arms", it can be used unchanged for all similar identification documents 82.
  • a motif present in a data area 84 of the identification document 82 serves as the individualized motif. This individualized motif is different for each identification document 82.
  • the security element 80 is now glued onto the data area 84 with the recessed motif layer 30, 40, so that the national coat of arms of the motif layer 30 is visible from the first viewing direction and the individualized motif of the data area 84 is visible from the second viewing direction. LIST OF REFERENCE NUMBERS

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un élément de sécurité (12) destiné à la protection de papiers de sécurité, de documents de valeur et autres supports de données (10), comprenant une image lenticulaire qui contient un réseau lenticulaire (24) composé d'une pluralité de microlentilles (26) et une couche de motif (30) sensible au rayonnement et disposée à distance du réseau lenticulaire, la couche de motif (30) sensible au rayonnement contenant au moins dans une zone de motif une pluralité de zones transparentes (40) produites par un effet de rayonnements et dans lesquelles la couche de motif sensible au rayonnement est ôtée. Selon l'invention, la couche de motif (30) sensible au rayonnement présente au moins dans la zone de motif une couche partielle de couleur (32) et une couche partielle de métal (34), la couche partielle de métal (34) est une couche de pigments métalliques imprimée dont la propriété d'absorption est adaptée à la propriété d'absorption de la couche partielle de couleur (32).
EP19742127.4A 2018-07-19 2019-07-09 Élément de sécurité doté d'une image lenticulaire Pending EP3823839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005705.5A DE102018005705A1 (de) 2018-07-19 2018-07-19 Sicherheitselement mit Linsenrasterbild
PCT/EP2019/000210 WO2020015847A1 (fr) 2018-07-19 2019-07-09 Élément de sécurité doté d'une image lenticulaire

Publications (1)

Publication Number Publication Date
EP3823839A1 true EP3823839A1 (fr) 2021-05-26

Family

ID=67383718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19742127.4A Pending EP3823839A1 (fr) 2018-07-19 2019-07-09 Élément de sécurité doté d'une image lenticulaire

Country Status (4)

Country Link
EP (1) EP3823839A1 (fr)
CN (1) CN112585014B (fr)
DE (1) DE102018005705A1 (fr)
WO (1) WO2020015847A1 (fr)

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WO2021205366A1 (fr) 2020-04-07 2021-10-14 Entrust Corporation Surfaces de document d'identification texturées au laser
DE102022000785A1 (de) * 2022-03-07 2023-09-07 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement für ein Wertdokument, Wertdokument und Verfahren zur Herstellung eines Sicherheitselements

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WO2010115235A1 (fr) * 2009-04-06 2010-10-14 Reserve Bank Of Australia Document de sécurité à image optiquement variable et procédé de fabrication
DE102010025278A1 (de) * 2010-06-28 2011-12-29 Leonhard Kurz Stiftung & Co. Kg Verfahren zur Dekoration von Oberflächen
CA2857335A1 (fr) * 2011-12-15 2013-06-20 3M Innovative Properties Company Objet de securite personnalise et methodes d'authentification d'un objet de securite et de verification d'un porteur d'un objet de securite
DE102012007747A1 (de) * 2012-04-18 2013-10-24 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
CN105073436B (zh) * 2013-02-19 2017-12-19 Ccl证券私人有限公司 具有转换图的安全设备
DE102014004700A1 (de) * 2014-03-31 2015-10-01 Giesecke & Devrient Gmbh Sicherheitselement mit einem Linsenrasterbild
CN105479974B (zh) * 2015-12-01 2018-07-13 中钞特种防伪科技有限公司 一种光学防伪元件及使用该光学防伪元件的光学防伪产品
DE102015015991A1 (de) * 2015-12-10 2017-06-14 Giesecke & Devrient Gmbh Sicherheitselement mit Linsenrasterbild
AU2017101215B4 (en) * 2017-09-05 2018-03-15 Ccl Secure Pty Ltd Laser marking and/or ablation to create micro-imagery for micro-lens security features

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CN112585014A (zh) 2021-03-30
WO2020015847A1 (fr) 2020-01-23
DE102018005705A1 (de) 2020-01-23

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