EP3823840A1 - Élément de sécurité muni d'une image lenticulaire - Google Patents

Élément de sécurité muni d'une image lenticulaire

Info

Publication number
EP3823840A1
EP3823840A1 EP19742128.2A EP19742128A EP3823840A1 EP 3823840 A1 EP3823840 A1 EP 3823840A1 EP 19742128 A EP19742128 A EP 19742128A EP 3823840 A1 EP3823840 A1 EP 3823840A1
Authority
EP
European Patent Office
Prior art keywords
layer
motif
security element
radiation
sublayer
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
EP19742128.2A
Other languages
German (de)
English (en)
Inventor
Veronika RACK
André Gregarek
Annett Bähr
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 EP3823840A1 publication Critical patent/EP3823840A1/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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • 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
    • B42D25/364—Liquid crystals
    • 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
    • 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
    • B42D25/23—Identity cards
    • 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
    • B42D25/355—Security threads

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 array made up of a plurality of microlenses and a radiation-sensitive motive layer arranged at a distance from the lenticular array, the radiation-sensitive motif layer in a motive area contains a multiplicity of transparency regions produced by the action of radiation.
  • Data carriers such as documents of value or identity documents, but also other objects of value, such as branded articles, 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, depending on the viewing angle, show a different color or brightness impression and / or a different graphic motif.
  • the data carriers with laser-engraved tilt images for protection.
  • Two or more different markings for example a serial number and an expiry date, are laser engraved at different angles by an arrangement of cylindrical lenses in the data carrier.
  • the laser radiation This creates a local blackening of the data carrier body, which makes the engraved markings visually visible.
  • only the identification engraved from this direction is visible when viewing, 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 invention has for its object to provide a security element of the type mentioned, which has a visually attractive appearance and is easy to manufacture.
  • the radiation-sensitive motif layer has a color sublayer and a contrast sublayer at least in the motif area, the color sublayer comprising color-imparting effect pigments which appear colored against the background of the contrast sublayer and appear transparent without a contrast layer.
  • the contrast sublayer is preferably formed by a colored or dark, in particular black, print layer.
  • Bright colors are all colors that are not white, black or gray.
  • colored colors with a high saturation for example a rich red, blue or green, are preferred.
  • the color sublayer advantageously contains interference pigments, pearlescent pigments and / or liquid crystal pigments as coloring effect pigments.
  • the color sublayer can in particular be an Iriodin® printing layer with mica-based pearlescent pigments.
  • Such pearlescent pigments produce gloss and color effects, the color gamut of which ranges from silver white to red and bronze-colored earth tones to gold shine. According to current understanding, the color effects arise from the interplay of transparency, light refraction and multiple reflection on the partial layers of the pigments.
  • the pearlescent pigments usually consist of thin mica platelets that are coated with a thin layer of metal oxide.
  • Other interference pigments can also contain other carrier materials and a number of different coatings.
  • the contrast sublayer 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 contrast sub-layer.
  • the color sublayer and / or the contrast sublayer are advantageously applied with a color layer thickness between 0.5 and 10 g / m 2 , in particular between 1 and 2 g / m 2 .
  • the contrast sublayer and / or the color sublayer are designed in the form of patterns, characters or a coding.
  • at least the contrast sublayer of the motif layer is removed in the transparency areas.
  • the color sublayer can advantageously also be removed in the transparency areas, or it can also be obtained with advantage in the transparency areas. Both variants each have certain advantages, which are described in more detail below in connection with the exemplary embodiments.
  • 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 of 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 transparency areas are always in register with the microlenses, this does not mean that each microlens must be assigned a transparency area.
  • there is a partial area in which there are no transparent areas in the motif layer is advantageously designed in the form of a further motif which lies entirely within the motif formed by the motif layer itself. In this way, accurate tilting effects can be generated, as described in more detail below.
  • 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 does not have to lie 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.
  • 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 cylindrical lenses. It can also be advantageously 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 pm and 50 pm, particularly preferably between 15 pm 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, for example when used in security threads or transfer elements it can also correspond to the total width of the thread or transfer element and can be several millimeters or several centimeters.
  • a second motif layer is arranged on the side of the radiation-sensitive motif layer facing away from the lenticular grid, which is structured in the form of a second motif, so that the second motif when viewing the security element from a second viewing direction through the lenticular screen and the Transparency areas of the radiation-sensitive motif layer are visible as a second appearance.
  • the second motif layer is advantageously formed by a multicolored or dark, in particular black, print layer, it being currently preferred that the second motif layer have the same color or color as the contrast sublayer.
  • Advantageous visual effects can be achieved in particular if the second motif layer, apart from the transparency regions produced by the action of radiation, lies entirely within the area of the contrast sublayer.
  • 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 regions of the radiation-sensitive motif layer, a layer below the security element Is visible underground 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.
  • Such 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. It is further provided that 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 with the lens grid and the transparent border areas arranged 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 lenticular screen and the transparency areas of the radiation-sensitive motif layer.
  • the invention also includes a method for producing a security element with a lenticular image, in which a 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, and in the radiation-sensitive motif layer Radiation exposure through the lenticular grid a variety of transparency areas is generated.
  • the radiation-sensitive motif layer is formed at least in the motif area with a color sub-layer and a contrast sub-layer, and the color sub-layer comprises color-giving effect pigments which have a colored effect against the background of the contrast sub-layer and which do not Contrast layer appear transparent.
  • the lenticular image shows at least two different appearances from different viewing directions, with the method producing the transparency areas in the radiation-sensitive motif layer in register with the microlenses of the lenticular screen, and the radiation-sensitive motif layer outside the transparency areas produced by the action of radiation opaque and is 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 direction of view 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 pm), in particular lasers in the IR-A range (wavelength 0.78-1.4 pm), for example at a wavelength of approximately, are advantageously used as the laser source 1064 nm.
  • NIR NIR
  • the following parameters are suitable for ablation:
  • a security element according to the invention can also contain more than two representations which are visible from more than two different viewing directions. Further exemplary embodiments and advantages of the invention are explained in the following with reference to the figures, in which the representation of scale and proportions has been omitted in order to increase the clarity. Show it:
  • FIG. 1 is a schematic illustration 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, 8 schematically shows a security element according to the invention, in which the second motif layer has been dispensed with,
  • Fig. 11 is a security element with a precise tilting effect according to a further embodiment of the invention in cross section, and Fig. 12 in (a) and (b) the appearance of the security element of
  • FIG. 1 shows a schematic representation 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 to it.
  • 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 trans fer elements shown for illustration in banknotes, but can also be used for example with security threads, wide security strips or cover films which are arranged over an opaque area, a window area or a continuous opening of a data carrier.
  • the two appearance images in the exemplary embodiment are formed by a two-color illustration 14A of the value number "50" and an illustration 14B of two colored rectangles, but it is understood that in practice the appearances are typically more complex motifs, such as geometric patterns, portraits, coding, numbering, architectural, technical or natural motifs.
  • 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 introduced into the motif layer of the lenticular image in a particularly simple yet highly precise manner.
  • Figure 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.
  • Figure 3 shows a top view of the security element 12 without the Linsenras ter and thus without the focusing effect of the microlenses.
  • FIGS. 2 and 3 show the finished security element 12, but for understanding the complex layer structure and the interaction of the individual layers, the detailed description of the production of the security element with reference to FIGS. 4 to 7 is particularly helpful.
  • 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 Arranged on the second main surface of the carrier substrate 22 is a laser-sensitive motif layer 30, which in the exemplary embodiment shown consists of two sub-layers, namely a color sub-layer 32 containing coloring effect pigments and a black contrast sub-layer 34.
  • the color sublayer 32 in the exemplary embodiment is an Iriodin® color, that is to say a printing ink with mica-based pearlescent pigments.
  • the contrast sublayer 34 is formed in the exemplary embodiment by a black printing ink. Without a contrast layer in the background, the partial color layer 32 with the pearlescent pigments appears transparent and practically does not appear when viewed. In areas where the contrast sublayer is present and a dark background is det, however, the pearlescent pigments appear with strong colors and rich colors.
  • 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 have a registration with 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 the colored appearance of the pearl luster pigments against a dark background, while the areas in which only the contrast sublayer 34 is present have a non-colored, black environment for the value "50" forms.
  • a viewer looks from a first viewing direction 50 at the material areas 42 of the motif layer 30 left standing and therefore perceives the colored value number "50" in front of a dark environment as the appearance 14A.
  • the cutouts 40 are not visible from the viewing direction 50, so that the representation of the value number “50” appears to the observer over the entire surface.
  • 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 the cutouts 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 monochrome or arbitrarily complex multicolored motifs can also be produced here if desired.
  • 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-area, or, as in the embodiment of FIGS. 2 and 3, itself only partially present and therefore in the areas lying outside the motif layer 60, the view of an underlying layer lying beneath the security element 12 can be seen.
  • the background layer can be formed, for example, by the substrate of the banknote 10 (indicated by dashed lines in FIG. 2) or by another data carrier on which the security element 12 is applied.
  • the background layer can be single-colored or self-structured and 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 black printing layer 34 is printed over the entire surface of the structured color sub-layer 32, as shown in FIG. 5 (a). It is important here that the black printing layer 34 forms a contrast layer for the pearlescent pigments of the color sub-layer 32, and this therefore has a strongly colored effect against the background of the printing layer 34. As shown in the top view of FIG. 5 (b), the motif layer 30 with the colored value number “50” (reference number 32) is present against a dark background 34 after this method step.
  • the printing layer 34 can in particular be printed with a motif-shaped outline, for example as a circular disk, star or the like.
  • full surface means that the print layer is not designed as a grid, but rather fills the entire area within its outline.
  • the surface of the motif layer 30 is exposed to near-infrared laser radiation 70 over a large area through the lens grid 24, as shown in FIG. 6 (a).
  • the laser radiation 70 is focused by the cylindrical microlenses 26 in a line shape onto the motif layer 30 arranged on the second main surface of the carrier substrate 22 and ablates there the color sub-layer 32 and the black contrast sub-layer 34, so that line-shaped cutouts 40 in the motif layer 30 arise.
  • Black print layers such as the contrast sublayer 34 show a high absorption for laser radiation in the near infrared and can be ablated easily with a wide range of laser parameters.
  • the Color sublayer 32 with the effect pigments is also removed in the exemplary embodiment either by its own absorption or in any case by the heat generated during the absorption of the laser radiation by the adjacent black printing layer 34.
  • the color sub-layer 32 is not physically removed, it no longer appears to the viewer after the laser exposure, since the color sub-layer 32 after the unloading of the underlying contrast sub-layer 34 practically no longer appears due to its transparency. Designs that take advantage of this effect are described in more detail below.
  • the color particles of the color sub-layer and the contrast sub-layer should be easy to remove.
  • the film therefore advantageously does not lie on a substrate with the layers to be ablated, but is lasered "in the balance".
  • the motif layer 30 with the colored value number "50" (reference numeral 32) and the dark background 34 is only present in the material areas 42 left after this method step.
  • 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 brought 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 in the form of a second motif is structured with two colored rectangles 62, 64.
  • the security element now has two structured motif layers 30 and 60, as shown in FIG. 7 (b), 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 at most transparent layers, for example a transparent protective or covering layer and / or a transparent adhesive layer, were applied to the first motif layer 30.
  • the resultant security element 80 shows, when viewed from a first viewing direction, the above-described first motif formed by the first motif layer 30 and from a second viewing direction in the recesses 40 of the first motif layer 30, the view of an underlying layer is free.
  • 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 identity document 82 for example a passport photo of the holder, serves as the individualized motif. This individualized motif is different for each identification document 82.
  • the security element 80 is now glued to 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.
  • FIGS. 9 and 10 show a further embodiment of a security element 90 according to the invention with a precisely fitting tilting effect, for the production of which the distinctly different absorption of the color sublayer 32 and the contrast sublayer 34 is specifically used.
  • the security element 90 is in principle constructed like the security element 12 of FIG. 2 and contains a carrier substrate 22 which is rastered on a main surface with a lens 24 and on the opposite main surface with a first, la sersensitive motif layer 30 is provided.
  • a second motif layer 94 is arranged above the first motif layer 30.
  • the first motif layer 30 consists of two sub-layers, namely a color sub-layer 32 containing color-imparting effect pigments, for example a printing ink with mica-based pearlescent pigments, and a black contrast sub-layer 34 which is formed by a black printing ink.
  • a color sub-layer 32 containing color-imparting effect pigments, for example a printing ink with mica-based pearlescent pigments
  • a black contrast sub-layer 34 which is formed by a black printing ink.
  • the color sub-layer 32 was applied as a motif 100 in the form of the continuous lettering "fifty euro" (FIGS. 10 (a), 10 (b)) to the carrier film 22. prints, as basically described in Fig. 4. Then the contrast sublayer 34 was printed as a continuous layer in the form of a second motif, in the exemplary embodiment in the form of a circular disk 102 (FIG. 10 (a)).
  • the cross section of FIG. 9 shows an area of the security element 90 within the printed circular motif 102.
  • the layer sequence 32, 34 was then exposed to NIR laser radiation over a large area through the lens grid 24, as is basically the case in FIG.
  • the laser parameters being selected such that only the black contrast sublayer 34, but not the color sublayer 32, which is largely transparent to the laser radiation, is ablated by the laser radiation. Due to the significantly higher absorption of the black contrast sublayer 34, such laser parameters can always be found without problems. If the laser power is not raised too far above the removal threshold of the contrast sublayer 34, the heat conduction to the color sublayer 32 is also kept sufficiently low to avoid removal of the color sublayer 32. As a result, after this process step, the motif layer 30 is on the one hand non-worn-away color sub-layer 32 and with partly worn-off contrast sub-layer 34. Specifically, the contrast sublayer 34 is ablated in the transparent areas 40 and left in the material areas 42, while the color sublayer 32 is preserved in both areas 40, 42.
  • a second motif layer 94 in the form of a black printing layer in the form of another motif in the exemplary embodiment in the form of a star 104 (FIG.
  • FIGS. 10 (a) and 10 (b) The resulting appearance of the security element 90 from two viewing directions 106, 108 is illustrated in FIGS. 10 (a) and 10 (b).
  • the viewer looks from a first viewing direction 106 at the material areas 42 in which the contrast sublayer 34 has been left.
  • the contrast sub-layer 34 each represents a dark background for the lettering 100 formed by the color sub-layer 32 "fifty euros", so that the lettering appears with rich colors against the dark background of the circular motif 102, as in FIG. 10 (a ) illustrated.
  • the dark background is missing, so that any color sub-layer 32 which may be present there remains practically invisible.
  • the viewer looks at the transparency regions 40 of the circular motif 102, in which the contrast sublayer 34 has been removed, but the color sublayer 32 has been left standing, due to the focusing effect of the microlenses 26.
  • the second motif layer 94 forms a dark background for the lettering 100, so that the colored lettering "fifty euros" is still visible there.
  • the security element 90 shows a tilt when tilting from the first viewing direction 106 into the second viewing direction 108. from the circular motif 102 to the star motif 104, each with a lettering 100 arranged precisely within the motifs 102, 104, which is always visible at practically the same location.
  • the color sub-layer 32 can be slightly bleached or its color effect changed by the laser exposure when the contrast sub-layer 34 is removed, so that the color impression of the lettering 100 in the star motif 104 differs from the color impression of the lettering 100 in the circular motif 102 different. The perfect fit of the lettering in both viewing directions is not affected.
  • black printing layers 34, 94 printing layers with other colors can also be used, with darker or stronger colors, for example a strong red, a dark blue or a deep green, which bring out the effect pigments better.
  • a colored mother-of-pearl shimmer is created with a combination of the color of the contrast partial layer 34 or of the second motive layer 94 and the color of the effect pigments of the color partial layer 32.
  • FIGS. 11 and 12 An alternative design to the exemplary embodiment in FIGS. 9 and 10 is illustrated in FIGS. 11 and 12 with the aid of the security element 120, which shows closely related visual effects, but has a different layer structure and is produced in a different way.
  • the security element 120 contains a carrier substrate 22, which is provided on one main surface with a lens grid 24 and on the opposite main surface with a first, laser-sensitive motif layer 30.
  • the laser-sensitive motif layer 30 consists of two sub-layers, namely a color sub-layer 32 in the form of a printing ink with mica-based pearlescent pigments, and a black contrast sub-layer 34 which is formed by a black printing ink.
  • the color sub-layer 32 was printed on as motif 100 in the form of the continuous lettering “fifty euros” (FIGS. 11 (a), 11 (b)).
  • the contrast sublayer 34 was printed as a continuous layer in the form of a second motif, in the exemplary embodiment in the form of a circle 102 (FIG. 12 (a)).
  • the cross section of FIG. 11 shows a region of the security element 120 within the printed circular motif 102.
  • the layer sequence 32, 34 was subjected to NIR laser radiation through the lenticular grid 24, whereby, as in the design of FIGS. 9 and 10, the laser parameters can be selected such that only the black contrast sublayer 34, but not the color partial layer 32, which is largely transparent to the laser radiation, is ablated.
  • the motif layer 30 is exposed to laser radiation over a large area over the entire area of the circular motif 102. Rather, the motif layer 30 is not exposed to laser radiation in a partial area 122 of the circular motif 102, which is formed in the form of a star 104. The motif layer is only exposed to laser radiation in area 124, which lies outside of partial area 122.
  • FIGS. 12 (a) and 12 (b) The resulting appearance of the security element 120 from two viewing directions 106, 108 is illustrated in FIGS. 12 (a) and 12 (b) and corresponds essentially to the appearance described in connection with FIGS. 9, 10.
  • the viewer looks from a first viewing direction 106 at those material areas 42 that either lie within the unloaded area 122 or that are in the exposed area 124 in which the contrast Sub-layer 34 was left standing.
  • the contrast sub-layer 34 therefore represents a dark background for the "fifty-euro" lettering formed by the color sub-layer 32, so that the lettering 100 appears with rich colors against the dark background of the circular motif 102, as shown in FIG 12 (a) shown.
  • the dark background is missing, so that any color sub-layer 32 which may be present there remains practically invisible.
  • the viewer due to the focusing effect of the microlenses 26 within the circular motif 102 in the area 124, looks at the lasered transparency areas 40 in which the contrast sublayer 34 has been removed. Since there is no dark background layer in the area 124, the color sub-layer 32 cannot be recognized by the viewer. In the unloaded area 122, which is designed in the form of the star motif 104, no transparency areas were generated, so that the contrast sublayer 34 there represents a dark background for the lettering 100 and this therefore appears in color to the viewer. As a result, the star motif 104 with the colored lettering "fifty euros" is visible from the viewing direction 108.
  • a motif such as the star motif
  • the cross section of the laser beam in these variants corresponds to the motif.
  • a plurality of microlenses of the lenticular array are simultaneously exposed to the motif-shaped beam cross section with the laser beam.

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  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Finance (AREA)
  • Accounting & Taxation (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, documents de valeur et autres supports de données (10), comprenant une image lenticulaire qui contient un réseau lenticulaire (24) d'une pluralité de microlentilles (26) et une couche de motif (30) sensible au rayonnement et disposée à distance de l'image lenticulaire, la couche de motif (30) sensible au rayonnement contient, dans une zone de motif, une pluralité de zones transparentes (40) produites par effet de rayonnements. L'invention prévoit que 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 contraste (34), la couche partielle de couleur (32) comportant des pigments à effet colorant qui ont une action colorante devant l'arrière-plan de la couche partielle de contraste (32) et qui, sans couche de contraste, ont une action transparente.
EP19742128.2A 2018-07-19 2019-07-09 Élément de sécurité muni d'une image lenticulaire Pending EP3823840A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005697.0A DE102018005697A1 (de) 2018-07-19 2018-07-19 Sicherheitselement mit Linsenrasterbild
PCT/EP2019/000211 WO2020015848A1 (fr) 2018-07-19 2019-07-09 Élément de sécurité muni d'une image lenticulaire

Publications (1)

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EP3823840A1 true EP3823840A1 (fr) 2021-05-26

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US (1) US11400748B2 (fr)
EP (1) EP3823840A1 (fr)
CN (1) CN112423993B (fr)
DE (1) DE102018005697A1 (fr)
WO (1) WO2020015848A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2021205366A1 (fr) 2020-04-07 2021-10-14 Entrust Corporation Surfaces de document d'identification texturées au laser
US11667145B2 (en) * 2020-11-26 2023-06-06 Thales Dis France Sas Personalizable color-shifting data carrier

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DE19544130A1 (de) * 1995-11-27 1997-05-28 Giesecke & Devrient Gmbh Datenträger mit optisch variabler Farbe
US7712673B2 (en) * 2002-12-18 2010-05-11 L-L Secure Credentialing, Inc. Identification document with three dimensional image of bearer
DE10353092A1 (de) 2003-11-12 2005-06-16 Giesecke & Devrient Gmbh Datenträger mit Kennzeichnungen
DE102005025095A1 (de) * 2005-06-01 2006-12-07 Giesecke & Devrient Gmbh Datenträger und Verfahren zu seiner Herstellung
DE102008013167A1 (de) * 2008-03-07 2009-09-10 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
GB2464496B (en) * 2008-10-16 2013-10-09 Rue De Int Ltd Improvements in printed security features
DE102009006301A1 (de) * 2009-01-27 2010-07-29 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
MX2011010486A (es) 2009-04-06 2012-02-23 Australia Reserve Bank Documento de seguridad con una imagen opticamente variable y metodo de fabricacion.
DE102009040975A1 (de) * 2009-09-11 2011-03-24 Ovd Kinegram Ag Mehrschichtkörper
RS57130B1 (sr) 2010-06-28 2018-07-31 Leonhard Kurz Stiftung & Co Kg Postupak za dekoraciju površina
DE102010025278A1 (de) * 2010-06-28 2011-12-29 Leonhard Kurz Stiftung & Co. Kg Verfahren zur Dekoration von Oberflächen
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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
DE102014012375A1 (de) * 2014-08-20 2016-02-25 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines optischen Elementes und optisches Element
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PL238769B1 (pl) * 2016-10-14 2021-10-04 Polska Wytwornia Papierow Wartosciowych Spolka Akcyjna Dokument zabezpieczony z elementem zabezpieczającym, sposób wytwarzania dokumentu zabezpieczonego oraz element zabezpieczający
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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US11400748B2 (en) 2022-08-02
CN112423993B (zh) 2022-02-11
CN112423993A (zh) 2021-02-26
DE102018005697A1 (de) 2020-01-23
US20210276359A1 (en) 2021-09-09
WO2020015848A1 (fr) 2020-01-23

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