EP2349736B1 - Elément de sécurité avec élément visuel sensible à la pression - Google Patents

Elément de sécurité avec élément visuel sensible à la pression Download PDF

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Publication number
EP2349736B1
EP2349736B1 EP09748243.4A EP09748243A EP2349736B1 EP 2349736 B1 EP2349736 B1 EP 2349736B1 EP 09748243 A EP09748243 A EP 09748243A EP 2349736 B1 EP2349736 B1 EP 2349736B1
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EP
European Patent Office
Prior art keywords
elastically deformable
deformable region
layer
functional structure
region
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EP09748243.4A
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German (de)
English (en)
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EP2349736A2 (fr
EP2349736B2 (fr
Inventor
Winfried HOFFMÜLLER
Manfred Heim
Michael Rahm
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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    • 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
    • B42D25/324—Reliefs

Definitions

  • the invention relates to a security element for a data carrier, the visual impression arising from this is reversibly changeable by mechanical pressure on the security element, a data carrier with such a security element, a transfer element with such a security element for application to a data carrier and a method for producing such security element.
  • Security elements for the purpose of security, which permit verification of the authenticity of the article and at the same time serve as protection against unauthorized reproduction.
  • security elements often produce a highly visible visual impression, which is why such security elements are used in addition to their function as securing means sometimes even as decorative elements for such media or for their packaging.
  • a security element can be embedded in such data carriers, for example in a banknote or in a chip card, or be designed as a self-supporting or non-self-supporting transfer element, for example as a non-self-supporting patch or as a self-supporting label, after its manufacture on a data carrier or other object to be secured , for example, over a window area of the data carrier is applied.
  • 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 papers forgery, such as passports or other identification documents, and also card-shaped data carriers, in particular chip cards, as well as product security elements, such as labels, seals . Packaging and the like.
  • the term “data carrier” also includes non-executable precursors of such data carriers which, for example in the case of security paper, are in quasi-endless form and are processed further at a later time, for example into banknotes, checks, shares and the like.
  • security elements can have optically variable elements which convey different visual impressions to the viewer from different viewing angles.
  • optical interference layers can be present either over the entire surface or in pigment form.
  • Such interference layers typically have a thin-film structure and comprise a reflective layer, an absorber layer and one or more intervening dielectric spacer layers and are based, for example, on mica, on SiO 2 or on Al 2 O 3 .
  • Printing inks with pigments of such single or multilayer interference thin layers are also available.
  • interference layers or interference layer pigments it is also possible to use cholesteric liquid crystals, which are present, for example, as liquid-crystalline silicone polymers.
  • cholesteric liquid crystals which are present, for example, as liquid-crystalline silicone polymers.
  • holograms which include metallic layers typically formed by vacuum deposition, or diffraction gratings, at different viewing angles, also exhibit a different visual impression to an observer.
  • the different optical impressions for a viewer can convey a so-called color-shift effect, in which different shades can be recognized by the observer at different viewing angles.
  • effect layer is completely transparent and thus invisible to a viewer, while it shows a hue at a different viewing angle (effect angle).
  • Interference layers consisting of a single dielectric layer, inks with pigments of such interference layers or inks with liquid crystalline pigments are often highly translucent at all viewing angles, so that the color impression perceivable by the viewer when viewing the effect layer under the effect angle is relatively weak. Such effect layers with high light transmission are therefore preferably applied over dark or black backgrounds to improve the visibility of the color change. In contrast, multilayered interference layers and multilayered interference layer pigments show less translucency and are sometimes completely opaque.
  • a moiré magnification arrangement is described as a security feature.
  • This has a regular two-dimensional arrangement of identical printed microimages and a regular two-dimensional array of identical spherical microlenses.
  • the microlens array has almost the same pitch as the microimage array.
  • the micro-image array is viewed through the microlens array, one or more enlarged versions of the microimages are created to the viewer in the areas where the two arrays are nearly in register.
  • moiré magnification 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 moiré pattern, which in this case appears as an enlarged and possibly rotated image of the repeated elements of the image raster. Further design variants and effects based on this mechanism are described, for example, in the article “ Properties of moire magnifiers “, Kamal et al., Optical Engineering 37 (11), pp. 3007-3014 (November 1998 ).
  • Regular microlens arrays can also be used as verification elements for security elements, as described in US Pat EP 1147 912 B1 is described. Certain structures of a security element are only visible to the user when viewed through such a verification element, so that the function of the security element can be hidden for an unbiased viewer.
  • an optically variable security element with an achromatically reflecting microstructure in the form of a mosaic is known.
  • the mosaic shows a predetermined motif, which is composed of a number of pixels, wherein the pixels are each constructed from a plurality of achromatically reflecting micromirrors.
  • the micromirrors are formed, for example, from metallized flanks of a sawtooth structure.
  • the flanks of the micromirrors of one pixel have the same angle of inclination, while the angles of inclination of the flanks of the different pixels differ.
  • the pixels show different optical impressions among the observer at different viewing angles.
  • the venetian blind has raised, line-shaped, opaque areas, which have a characteristic size and a distance from each other that can not be resolved with the naked eye. When viewed vertically, the shutter image is therefore substantially transparent. On the other hand, if the observer tilts the blind image perpendicular to the line-shaped, opaque areas, these areas obstruct the view and the blind image appears opaque to the observer.
  • the height-to-width ratio of the opaque regions is typically in the range of 2: 1.
  • the space between the raised areas can also be filled with a translucent, ie semi-transparent, or even completely transparent lacquer.
  • the raised areas are transparent and obliquely evaporated with an opaque coating, thereby providing an asymmetric, opaque coating of the raised areas. Accordingly, at a given viewing angle, there is also an asymmetric view, which depends on the orientation of the blind image relative to the observer.
  • photonic crystals which show a change in color under mechanical pressure.
  • Such photonic crystals often have the structure of inverse opals. They typically have cavities which are produced, for example, by dissolving SiO 2 nanoparticles with dilute hydrofluoric acid.
  • Object of the present invention is to provide an easy-to-test security element, which is preferably produced in a rapid process, so for example, can dispense with the use of the aforementioned photonic crystals.
  • the basic idea of the present invention is to provide an elastically deformable, in particular compressible region, which can assume a deformed and an undeformed state and thus different spatial positions or, preferably, also different spatial expansions. It can be achieved by external mechanical pressure macroscopic rearrangements of the elastically deformable region or other with the elastically deformable region of mechanically connected elements of the security element. This results in a variety of ways to change the visual appearance and thus the visual impression in the viewer due to mechanical pressure. The change in the visual impression can be recognized by the viewer with the naked eye.
  • the security element according to the invention comprises an elastically deformable and optionally additionally compressible region and a functional structure which creates a visual impression on the viewer.
  • the elastic In this case, the deformable region and the functional structure interact mechanically with one another in such a way that, in an undeformed state of the elastically deformable region, a visual impression of the functional structure results, which differs from the visual impression in a deformed state of the elastically deformable region.
  • the use of the elastically deformable region in conjunction with a functional structure which according to the invention produces an easily verifiable, variable visual impression ensures that such a security element can not be imitated by a simple copy, for example by a color copier.
  • Such elastically deformable regions can only be produced with significantly higher outlay.
  • the variable visual impression of the functional structure which requires a well-defined mechanical interaction between the elastically deformable region and the functional structure, is not easily imitated by a counterfeiter, but easily verifiable by a user.
  • the mechanical interaction between the elastically deformable region and the functional structure for producing a variable visual impression can be realized in various ways.
  • the functional structure itself can be realized in various ways.
  • the functional structure which creates the visual impression on the viewer, has optically variable properties and produces different visual impressions in the observer under different viewing angles.
  • the functional structure comprises, for example, an interference thin-film, a layer with interference thin-film pigments, a layer with liquid-crystal pigments or diffraction structures, such as, for example Holograms.
  • the functional structure may alternatively comprise a metallization.
  • the spatial position of a part of the functional structure or of the entire functional structure in the undeformed state of the elastically deformable region differs from the spatial position within the security element in the deformed state of the elastically deformable region.
  • the functional structure is designed such that the visual impression that the functional structure generates in the observer is changed by this change in position.
  • the position of at least part of the functional structure within the security element is macroscopically changed for this purpose.
  • the change in the spatial position may relate to the spatial position within the security element and / or the orientation of the at least part of the functional structure within the security element.
  • an angle of the functional structure and thus also the viewing angle under which a viewer sees the at least one part of the functional structure changes.
  • a security element is provided in which, due to the mechanical interaction between elastically deformable region and functional structure, the viewing angle under which the functional structure is viewed changes by the mechanical pressure on the security element, without the external perspective of the observer on the security element as a whole must change.
  • the functional structure in this case comprises an optically variable layer, then the corresponding optically variable effect can be observed, for example, in security elements which can not be tilted because of their attachment, without the viewer being forced to make the change necessary for this Observation angle must change its position relative to the security element.
  • the elastically deformable region and the functional structure form a common region.
  • the elastically deformable region thus contains the functional structure and is integrated in the elastically deformable region.
  • the functional structure contains an optically variable element, with which a security element is created in which optically variable elements are introduced into an otherwise preferably translucent, elastically deformable region.
  • the optically variable element of the functional structure therefore undergoes the same macroscopic positional change and / or change in orientation as the elastically deformable region upon deformation of the elastically deformable region.
  • the functional structure is firmly connected to the surface of the elastically deformable region and also comprises an optically variable element.
  • the functional structure is arranged directly on the elastically deformable region. This can be done by flocking the elastically deformable region with, for example, uniform layer thickness with fibers which exhibit a color shift effect, for example due to cholesteric liquid crystal pigments or interference thin-film pigments contained therein. With mechanical pressure on the substrate, the viewing angle of the fibers changes, resulting in a color shift effect.
  • a further intermediate layer is provided between the elastically deformable region and the functional structure, although of an inflexible, rigid material exists due to their structuring but still allows a spatial change in the position of the functional structure upon deformation of the elastically deformable region.
  • the intermediate layer of a rigid, inflexible material for example, as a broken layer, formed, whereby mechanically independent of each other and thus individually tiltable elements arise.
  • the elastically deformable region can then advantageously be designed as a flat, compressible layer with a uniform layer thickness, which ensures a simple and cost-effective production of the elastically deformable region.
  • the functional structure is firmly connected to the surface of the elastically deformable, preferably compressible region, this region being structured and having a structure with spatially varying layer thickness.
  • the functional structure can be arranged on the elastically deformable region at a suitable angle, below which a variable optically variable impression, such as a color shift effect, already at a small deformation of the elastically deformable region and thus already upon exerting a low mechanical pressure on the security element can be perceived.
  • the elastically deformable region may have a sawtooth or lamellar structure, wherein the functional structure is arranged on the flanks of the saw teeth or lamellae.
  • the plastic layer used may for example consist of an adhesive, a resin or an embossing lacquer.
  • the elastic parameters of the plastic layer are adjusted for example by crosslinking, so that an elastomer with suitable elasticity and optionally suitable compression behavior is formed.
  • the crosslinking can occur, for example, via (UV) irradiation or the effect of temperature. However, the crosslinking can also take place automatically after a predetermined time, for example when using a two-component plastic.
  • the crosslinking can be done in a separate process step following the embossing of the plastic layer.
  • the crosslinking can also take place in one process step together with the embossing, for example by embossing with elevated temperature.
  • the crosslinking can also be done or completed before the provision of the plastic layer, so that even before embossing an elastomer with the desired elastic and preferably compressible properties. The prerequisite is that such an elastomer can be permanently embossed to the desired extent.
  • an elastically deformable and optionally compressible layer can be created with spatially varying layer thickness, wherein there are many degrees of freedom for the specific design of the embossed structure.
  • the elastically deformable embossing structure and also the embossing stamp on a sawtooth structure which is particularly preferably regularly.
  • the functional structure for example in the form of an optically variable layer, is then applied to the flanks of the saw teeth. With mechanical pressure, the saw teeth are reversibly folded, which changes the viewing angle and therefore creates a changed visual impression in the viewer without the entire security element, for example, has to be tilted or generally changed in its position.
  • embossing soft plastics and elastomers which may not yet be cross-linked, since such soft plastic layers show, for example, increased adhesion to the stamper, so that it can not be deducted arbitrarily from the embossed structure.
  • the adhesion of the embossed structure to the embossing punch can be reduced by a suitable surface coating of the embossing punch, for example in the form of a suitable release layer.
  • the adhesion of the coating to the stamping die is preferably lower than the adhesion of the coating to the surface to be provided with the stamping structure.
  • the coating can optionally be removed again from the embossed structure.
  • the coating remains on the embossed structure and forms at least part of the functional structure, which is arranged, for example, exclusively on the flanks of the sawtooth embossing structure and not on the vertical edges of the sawtooth structure.
  • the coating transferred from the die to the embossed surface is preferably a metallization.
  • other layers of a functional structure may be transferred, such as the dielectric layer of an interference thin film or a layer of interference thin film pigments or liquid crystal pigments.
  • the saw teeth of the sawtooth structure of the elastically deformable region in their foot region generally show a smaller tilt than at the tips of the saw teeth. Since the largest possible proportion of the optically variable layer of the functional structure is to be influenced by mechanical pressure and the area in which the optically variable effect can not be influenced by mechanical pressure should be as small as possible, it is advantageous if the foot region of the saw teeth is not optically shows variable effect.
  • the functional structure in the foot region of the saw teeth for example, recesses. In the case of an interference thin film, it is sufficient if only one of the layers forming the interference layer has recesses in the foot region, so that the remaining coatings in this region do not have an interference thin layer form more with interference effect.
  • the functional structure may be covered in the foot region of the saw teeth.
  • the aforementioned recesses are produced in a first production variant by oblique vapor deposition of the embossed structure.
  • the vapor deposition takes place in the direction of the flanks of the sawtooth structure of the embossed structure, so that the tips of the saw teeth shade the foot region of the flank of the respective adjacent sawtooth.
  • the vertical edges of the sawtooth structure are not coated in such oblique steaming.
  • a metallization or an optically variable layer can be vapor-deposited.
  • a low-viscosity wash ink is first applied to the embossed structure before the application of a coating to the embossed structure.
  • the wash color flows into the deepest places and thus covers only the foot areas of the edges of the saw teeth.
  • the low-viscosity wash ink wicks the tips of the sawtooth structure, which can be achieved by a suitable surface tension of the wash ink in relation to the embossed structure.
  • the desired coating is applied over the entire surface of the embossed structure and the wash color.
  • the wash ink preferably has a highly porous surface, which is not completely covered by the applied coating, as a result of which the wash ink can be washed out despite the applied coating in a further process step, so that the desired recesses are formed in the root area of the sawtooth structure.
  • the desired coating is applied over the entire surface of the sawtooth structure of the embossed structure.
  • a low-viscosity topcoat is applied to the coated embossed structure, so that the foot portions of the flanks of the sawtooth structure of the embossed structure are covered and thus no longer produce an optically variable effect.
  • the generation of the recesses in the foot region of the embossed structure is combined with the previously mentioned transfer of a coating during embossing of the embossed structure.
  • the desired coating to be transferred is applied over the entire surface of the embossing punch. Subsequently, the coating in the region of the tips of the sawtooth structure of the stamping die is removed again. Thereafter, an adhesive layer is applied over the entire surface of the die or on the applied on the die coating and then the plastic layer, which forms the elastically deformable region in the finished process product, embossed with the thus prepared die, so that the desired embossing structure is formed and the Adhesive layer is transferred with the partially existing coating.
  • the coating Since the coating has been removed at the tips of the sawtooth structure of the stamping die prior to the stamping step, there is no coating as desired after transfer of the coating in the root area of the sawtooth structure of the stamping structure. Removal of the coating from the dies of the die can be accomplished by mechanical scrubbing on the tips. It is advantageous if the applied coating is a slightly cleavable coating.
  • the desired coating is first applied to the embossing stamp over the full area.
  • a low-viscosity adhesive is applied to the sawtooth structure of the embossing die, so that it collects in the foot areas of the sawtooth structure of the embossing die before the embossed structure is embossed.
  • the coating then remains on the embossed structure only at the locations where an adhesive layer has previously been applied. In other words, an embossed structure is thus produced which only shows a coating at the tips and has the desired recesses in the foot regions.
  • the adhesion of the coating to the embossing punch is greater than the adhesion of the coating to the embossed structure, so that when the embossing stamp is removed from the embossed structure, the coating in the foot region of the sawtooth structure of the embossed structure is removed again.
  • the die is made of a hard embossing lacquer, since in this case the desired adhesive strengths of the various coatings and adhesive layers can be easily matched.
  • the plastic layer to be embossed is constructed in two layers and comprises an upper and a lower layer, wherein the lower layer can be removed in a targeted manner after embossing. If a sawtooth structure is embossed in a central region of such a two-layered substrate, then the upper layer will lie on the surface of the flanks of the saw teeth, while the lower layer will lie beneath these flanks and in the simplest case will be exposed at the vertical edges of the sawtooth structure. In a further method step, the lower layer is then removed, so that only the upper layer, which had previously formed the edges of the saw teeth, remains as a lamellar structure.
  • This lamellar structure forms the elastically deformable region of the security element, which can be designed incompressible.
  • such lamellae have the advantage that the lamellae can be elastically deformed, in particular fully folded, even at a lower mechanical pressure, so that they lie, for example, parallel to the surface of the security element.
  • the security element in particular its elastically deformable region, a sawtooth or lamellar structure, as described for example in the second variant of the second embodiment of the first embodiment of the invention, it may be advantageous if the tips of the saw teeth or lamellae are mechanically connected to each other to distribute a force exerted on the security element evenly on the individual sawteeth or lamellae mechanical pressure.
  • the saw teeth or lamellae then show a uniform elastic deformation and optionally compression, resulting in a uniform change in the visual impression upon deformation of the elastically deformable region.
  • This mechanical bonding is preferably done by laminating a, for example, inflexible translucent film on the tips of the saw teeth or lamellae, wherein the translucent film, for example, has a thin laminating adhesive layer.
  • the functional structure lies in the viewing direction in front of the elastically deformable region, so that the optical properties of the elastically deformable region have no significance are.
  • the elastically deformable region may therefore be opaque, for example.
  • the light path or the beam path within the security element in the undeformed state of the elastically deformable region differs from the light path in the deformed state of the elastically deformable region.
  • the spatial position of a part of the functional structure in the undeformed state of the elastically deformable region differs from the spatial position in the deformed state of the elastically deformable region.
  • the functional structure for this purpose comprises a first and a second element.
  • the second element is arranged in the viewing direction in front of the first element and translucent.
  • the elastically deformable region forms a spacer for the first and second elements of the functional structure, and in the undeformed state of the elastically deformable region, the first and the second element of the functional structure are spaced from each other so that, for example, a gap results, while in the deformed state of the elastic deformable region, the first and the second element of the functional structure are spatially in contact with each other.
  • the spacer is made compressible. However, due to its elastic properties alone, it can provide the necessary spatial relative movement of the first and second elements of the functional structure.
  • the second element is on the back, ie on the first element totally reflecting surface, especially retro-reflective.
  • the undeformed state of the elastically deformable region ie, when the first and the second element are spaced from each other, it is not possible to see through the first element of the functional structure lying behind the second element in the viewing direction.
  • the first element is therefore not visible in this state of the security element.
  • spatial contact of the first and second element takes place at the rear of the second element instead of a transition to air, which is located in the gap between the first and second element, now a transition to the material of the first element of the functional structure.
  • this material has a refractive index different from one, the refractive conditions on the back side of the second element of the functional structure change such that the condition of total reflection or retro reflection is canceled.
  • the light path or the beam path changes within the functional structure of the security element, and the first element of the functional structure becomes visible and can be viewed.
  • the second element on the back and the first element on the front carry a reflective or partially reflective coating.
  • interference effects as they are known, for example, in the form of Newtonian rings, are purposefully amplified and used as a visual effect.
  • the shape of such Newtonian rings generally depends on the spacing or spatial variation of the spacing of the first and second elements of the functional structure. The distance that occurs at a given mechanical pressure, for example, can be adjusted by suitable spacers.
  • a dielectric layer having a constant layer thickness is located on the rear side of the second element of the functional structure in addition to a partially reflecting layer, while a completely reflecting layer is located on the opposite front side of the first element of the functional structure.
  • the elastically deformable region and the functional structure are each formed in a layered manner. Furthermore, the elastically deformable region is translucent and arranged in the viewing direction in front of the functional structure. In the simplest case, the translucent elastically deformable region replaces the translucent first element of the functional structure of the previously described first embodiment of the second embodiment of the invention and thus forms part of the functional structure.
  • the translucent, elastically deformable region on the reverse side of the functional structure is designed to be totally reflective, in particular retro-reflective.
  • the functional structure is composed in the simplest case of a printed image or of metallized and demetallêten areas.
  • the functional structure is particularly preferably an optically variable layer showing, for example, a color shift effect.
  • the functional structure in the form of a raster image can be structured in a location-dependent manner; for example, the absorber layer and the dielectric layer can be removed in regions. In addition, the reflective layer can be removed in areas.
  • the functional structure may also include a diffraction grating, preferably in combination with a metallization and / or a high refractive index layer.
  • the security element comprises a moiré magnification arrangement.
  • the functional structure forms the microimage arrangement of such a moiré magnification arrangement
  • the elastically deformable region is arranged as a translucent intermediate layer between the microlens arrangement of the moiré magnification arrangement and the functional structure.
  • the elastically deformable region is formed here as a flat, compressible layer with a substantially constant layer thickness.
  • the elastically deformable region has a spatially varying layer thickness
  • the functional structure comprises an optically variable layer.
  • the elastically deformable region has oblique flanks, for example, with respect to the surface of the security element, whereby the optical path is refracted when viewed perpendicularly and the optically variable layer lying behind the elastically deformable region is viewed at an observation angle which is already evident in the undeformed state of the elastically deformable region deviates from the actual angle at which the security element is viewed.
  • the viewing angle to the optically variable layer can deviate significantly from the surface normal of the preferably planar, optically variable layer.
  • the elastically deformable region can again be in the form of a sawtooth structure and, as already discussed above, can be produced by embossing.
  • the elastically deformable region in this embodiment of the second embodiment is translucent, and instead of a change in the spatial position of the functional structure of the perspective on the lying in the viewing direction behind the elastically deformable region functional structure on the one hand spatially varying layer thickness and on the other by mechanical pressure on the elastically deformable region, such as a sawtooth structure changed.
  • the tips of the saw teeth are mechanically connected.
  • the flanks of the sawtooth structure of the elastically deformable region can be connected to another Coating, preferably a metallization, be provided to produce, for example, a blind effect.
  • a combination of the from WO 2007/079851 A1 known tiltable achromatic micromirrors and from the WO 2008/049533 be known because the arranged behind the elastically deformable region function structure showing, for example, a color shift effect, visible only by oblique viewing through the uncoated vertical edges of the sawtooth structure of the elastically deformable region because of the metallized, mirrored edge of the sawtooth structure of the elastically deformable region is.
  • the metallization on the flanks of the sawtooth structure in the foot of the saw teeth on recesses which can be achieved for example by oblique vapor deposition or metallization.
  • an opacity thus also results in the region of the vapor deposition angle, thus, in conjunction with the sawtooth structures, a louver effect.
  • the angle range from which the element appears opaque can thus be set via the evaporation angle.
  • the elastically deformable region is formed as a planar layer with a substantially spatially uniform layer thickness.
  • a further translucent layer of a translucent material is arranged, which is mechanically connected to the elastically deformable region and comprises a plurality of elements, which are preferably individually tiltable.
  • microlenses are provided with a uniform coating Layer thickness, in particular generated with an interference thin film.
  • Layer thickness in particular generated with an interference thin film.
  • uniform layer thicknesses can not be produced since the layer thickness depends on the orientation of the surface relative to the vapor deposition direction. Therefore, for example, on microlens arrays, no interference thin films having a uniform color shift effect can be provided yet, because in such interference thin films, the color shift effect depends on the film thickness of the dielectric film.
  • vertical cylinders are arranged on a translucent, planar layer at the locations where a microlens is to be formed.
  • a reflective layer, a dielectric layer and a partially reflecting layer are vapor-deposited by vertical vapor deposition, so that an interference thin layer having a uniform layer thickness of the various layers, in particular the dielectric layer, is formed on the flat surface and on the end faces of the cylinder.
  • the planar layer and the cylinders are for example heated or otherwise suitably treated, so that it comes to a running of, for example, thermoplastic material from which the flat layer and the cylinders are made.
  • the cylinders and the planar structure connect and form microlenses at the locations of the cylinders below the interference thin-film.
  • a security element is provided with an elastically deformable region with microlenses, which carry an optically variable coating, preferably in the form of an interference thin film as a functional structure.
  • the lenses included can either be reversibly deformed directly by pressure or transferred into an elastomer including the interference thin film. During the course of the Cylinder to the microlenses and even when deforming the microlenses, the applied interference thin film may possibly break, but this is irrelevant to the color impression.
  • the elastically deformable region preferably exhibits temporal hysteresis such that, after a mechanical pressure has been exerted, it initially remains in the deformed state for a predetermined period of time.
  • the visual impression of the functional structure in the deformed state of the elastically deformable region can be considered without the security element being covered by elements which exert the mechanical pressure, for example the finger of the observer.
  • the security element has areas which on the one hand are spaced apart from one another in the deformed and undeformed state of the elastically deformable region and on the other hand are in mechanical contact with one another, as described, for example, in the first embodiment of the second embodiment of the invention, at least one of these contact surfaces can also be used be provided with a suitable (translucent) adhesive layer, which ensures a temporally limited adherence of the two areas and a subsequent trouble-free detachment of both areas from each other.
  • a suitable (translucent) adhesive layer can be created, for example, by radiation-crosslinkable silicones.
  • Fig. 1 is shown as a volume banknote 1. It comprises a security element 2 in which the line-shaped tips of a sawtooth structure are shown schematically.
  • Fig. 2a is a side view of a security element 2 shown with a sawtooth structure.
  • a carrier substrate 1a On a carrier substrate 1a is a compressible, elastically deformable region 4 in the form of a layer with saw teeth 5 and thus arranged with a spatially varying layer thickness.
  • a coating 3 On the flanks of the saw teeth, a coating 3 is arranged, which forms a functional structure.
  • the coating 3 is in the simplest case a metallization or also an optically variable layer. With mechanical pressure on the saw teeth 5, these are compressed, whereby their flank angle changes.
  • the consideration takes place in Fig. 2a from above.
  • the angle at which the coating 3 is viewed, and thus the visual impression of the security element changes as the whole of the security element 2 as a whole remains the same.
  • the flank angle of the saw teeth 5 is chosen so that the perceptibility of the changing visual impression of the coating 3 is supported in deformation. If the coating 3 is, for example, an optically variable layer which exhibits a color-shift effect, then it is arranged within the security element 2 in such a way that, when the security element 2 is viewed vertically, the color-shift effect already occurs with slight deformation of the elastically deformable region 4.
  • the coating 3 breaks because of the deformation of the saw teeth 5 of the elastically deformable region 4, this plays only a minor role for the visual impression, since the typical size of such a crack is below the resolution of the eye and the mechanical deformation elastic Thus, it is reversible, so that after completion of the mechanical pressure of the elastically deformable region 4 assumes its original position and the cracks that may occur are thus closed.
  • Fig. 2b is a variant of in Fig. 1 shown security element 2 shown.
  • the saw teeth 2 are made of a rigid, inflexible material and are arranged on an elastically deformable, compressible region 4 in the form of a flat layer with a uniform layer thickness.
  • the saw teeth 5 are not mechanically connected to each other, which is indicated by the broken lines 6.
  • the rigid saw teeth 5 can be tilted individually on the elastically deformable layer 4 and partially submerged in it.
  • the flanks of the saw teeth 5 in turn carry the desired coating 3.
  • the elastically deformable region 4 is in this embodiment as a flat, compressible layer with uniform Layer thickness formed, which can be easily and inexpensively created.
  • Such mechanically unconnected rigid saw teeth 5 can form a cracked layer, which can be obtained by deliberately tearing a hard lacquer, such as by pulling the carrier substrate over an edge or by stretching, pressure or thermal stress on the carrier foil.
  • the foot areas of the saw teeth 5 represent preferred areas for such a crack because of the layer thickness which is only slight or zero there.
  • the cracks or fractures can be induced before or after the hard layer is brought into contact with the flexible layer.
  • such a sawtooth structure is produced from a hard lacquer on a carrier foil, for example.
  • the sawtooth structure is laminated with a laminating adhesive whose elasticity can be suitably adjusted, for example by crosslinking, so that the laminating adhesive forms the desired, elastically deformable region 4.
  • the carrier film is peeled off in a separating winding process and at the same time or at a later time, the sawtooth structure of the inflexible, rigid lacquer is broken, whereby individual saw teeth 5 are formed on the elastically deformable region 4.
  • Fig. 2c is another variant of in Fig. 2a shown embodiment shown.
  • the compressible, elastically deformable region 4 again lies in the form of a layer with saw teeth 5.
  • the functional structure is here as a flat layer 7 in the direction behind the elastically deformable region 4.
  • the saw teeth 5 of the elastically deformable Region 4 are therefore translucent.
  • the functional structure is viewed through the oblique edges of the saw teeth 5, whereby the light path is refracted and the angle at which the functional structure 7 is viewed differs significantly from the viewpoint of the observer on the security element 2.
  • flank angle of the saw teeth. 5 is set so that a variable visual impression, such as a color shift effect, even at a low deformation of the saw teeth 5 occurs.
  • Fig. 2d is a variant of in Fig. 2b shown embodiment shown. It is like in the Fig. 2c 1, the functional structure is provided as a planar layer 7 instead of a coating 3, which lies behind the sawteeth 5 of rigid, inflexible material and the elastically deformable region 4 in the viewing direction.
  • the saw teeth 5 and the elastically deformable region 4 are translucent in order to permit a consideration of the functional structure, primarily by the oblique flanks of the saw teeth 5. With mechanical pressure on the saw teeth 5, these tilt and dive partially into the elastically deformable region 4, whereby the angle at which the functional structure is seen changes.
  • Fig. 3 is another variant of in Fig. 2a shown embodiment shown.
  • the elastically deformable region is in the form of lamellae 9.
  • the lamellae 9 can themselves form the functional structure or have a functional structure in the form of the coating 3.
  • Such lamellae 9 can be produced, for example, by embossing a sawtooth structure into a two-layer embossed structure.
  • a layer 1b and thereon an intermediate layer is applied to the carrier substrate 1a, wherein the material of the layer 1b has a lower or no solubility with respect to a proposed solvent than the intermediate layer.
  • the saw tooth structure is embossed into the two layers, the layer 1b and the intermediate layer, wherein the intermediate layer is completely and the layer 1b is still partially structured.
  • the elastically deformable region 4 and, if the elastically deformable region 4 does not already form the functional layer, the coating 3 is applied, each of which is almost insoluble with respect to the intermediate layer with the proposed solvent.
  • the soluble intermediate layer is removed with the intended solvent, so that the lamellae 9 remain and are anchored in the layer 1b.
  • the material of the intermediate layer can also be chosen such that the intermediate layer can be removed in another way, for example by thermal melting, evaporation or blowing off.
  • the lamellae 9 form the elastically deformable region 4, which has a suitable mechanical elasticity and can be incompressible.
  • the lamellae 9 can be provided with a further thin, flexible layer for protection against mechanical breakage.
  • a security element 2 is shown with a sawtooth structure.
  • the tips of the saw teeth 5 are mechanically connected by an at least partially rigid layer 8.
  • the layer 8 is designed so rigid that they at least in the corresponding area a uniform distribution of the mechanical pressure the saw teeth 5 guaranteed.
  • the layer 8 ensures a uniform deformation and compression of the saw teeth 5.
  • the layer 8 ensures their regionally uniform tilting.
  • the layer 8 ensures a uniform deformation of the lamellae 9.
  • the layer 8 thus ensures an at least regionally uniform change of the visual impression of the functional structure when mechanical pressure is exerted on the security element 2.
  • the layer 8 is translucent. It is created for example by laminating an inflexible translucent film on the tips of the saw teeth 5 or lamellae 9, wherein the translucent film, for example, has a thin laminating adhesive layer.
  • the layer 8 is thus to be described as rigid if it distributes a local mechanical pressure on its surface over a large area to a specific region of the saw teeth 5. For example, even the stiffness of a conventional PET film may be sufficient to meet this condition.
  • the rigid layer 8 additionally provides protection for the individual lamellae 9 against mechanical breakage.
  • the illustrated embodiment shows a functional structure that is encompassed by the elastically deformable region 4.
  • the functional structure is thus part of the elastically deformable region 4.
  • the functional structure comprises optically variable elements in the form of liquid-crystal or interference thin-film pigments.
  • the elastically deformable region is in the form of fibers 10, which then show a color shift effect.
  • Such fibers 10 are also referred to as Colorshift fibers.
  • Such color shift fibers 10 are preferably non-compressible.
  • a plurality of such Colorshift fibers 10 are then arranged side by side in the security element, for example in the manner of a velvet fabric. This results in an area of the security element that produces a uniform visual impression under mechanical pressure. If the optically variable elements have only a low color strength, as is the case, for example, with liquid crystal or interference thin-film pigments, then a dark background can be provided for the Colorshift fibers 10 by creating the substrate 1a in dark or black color or is covered.
  • the elastically deformable region 4 comprising the functional structure is not provided in the form of fibers 10 but in the form of lamellae 9, as shown in FIG Fig. 3 is shown, or in the form of saw teeth 5, as shown in FIG Fig. 2a is shown. It can then each in the FIGS. 2a and 3 represented coating 3 omitted.
  • an interference thin film 11 is arranged on a carrier substrate 1a.
  • This consists of a partially reflecting layer 11.1 (absorber) of Cr, of a dielectric layer 11.2 of SiO 2 and of a reflective layer 11.3 (reflector) of Al.
  • this interference thin-film 11 produces a different color impression in the viewer and in particular a color-shift effect.
  • an elastically deformable, compressible region 4 in the form of a structure with saw teeth 5 is arranged on this interference thin film 11.
  • a metallic coating 3 is vapor-deposited on the flanks of the saw teeth 5.
  • the metallic coating 3 can be applied by oblique vapor deposition, so that 5 recesses 12 are created in the metal coating in the foot of the saw teeth.
  • the metallic coating 3 is made of Al.
  • the metallic coating 3 prevents the interference thin film 11 from being observed through the flanks of the saw teeth 5.
  • the vertical edges 13 are not coated and allow viewing of the interference thin film 11 in a limited angular range.
  • the area of the vertical edges 13 and thus the angle range under which the interference thin-film 11 can be viewed changes or decreases.
  • a louver effect is generated which allows the interference thin film 11 to be viewed in the undeformed state of the saw teeth 5 of the elastically deformable portion 4 in a different form from that in the deformed state.
  • the security element appears as a substantially continuous metallized surface. Since the flank angle of the saw teeth changes only slightly in the foot region under mechanical pressure because of the low layer height of the elastically deformable region 4, recesses 12 are provided in this region.
  • the elastically deformable layer 4 is translucent in this embodiment.
  • a non-illustrated variant of this embodiment represents a further development of the WO 2006/049533
  • the disclosed there, raised, opaque or coated areas and optionally also the intervening transparent areas of an elastically deformable material are generated.
  • This visually different impressions can be generated not only by tilting the security element, but also by mechanical pressure, preferably in the form of a shear force.
  • an interference thin film 11 is disposed on a support substrate 1a. Above this there is a translucent, rigid embossing lacquer layer 15. Above this there is a translucent, compressible, elastically deformable region 4. Embossing lacquer layer 15 and elastically deformable layer 4 each have spatially varying layer thicknesses. In the undeformed state of the elastically deformable region 4, the embossing lacquer layer 15 and the elastically deformable layer 4 are spaced apart from each other and have an intermediate cavity 16 in the form of a gap. Embossing lacquer layer 15 and elastically deformable region 4 have a corresponding sawtooth structure on the surfaces lying opposite one another.
  • the elastically deformable layer 4 is formed so that the edges of the sawtooth structure total reflection results in the figure from above coming light beams. This can be achieved by a sufficiently high refractive index, by a suitable backside interface coating, and / or by a suitable choice of the ramp angle of the saw teeth.
  • the elastically deformable region 4 extends laterally beyond the embossing lacquer layer 15 and forms spacers at these locations in order to create the cavity 16 in the undeformed state. In the deformed state of the elastically deformable region 4, they engage opposing surfaces of embossing lacquer layer 15 and elastically deformable portion 4 into each other, so that the cavity 16 disappears. As a result, the optical conditions at the back surface of the elastically deformable region 4 change, thereby canceling the condition of total reflection. Thus, upon deformation of the elastically deformable region, viewing of the underlying interference thin film 11 is possible.
  • the contact surface between the elastically deformable region 4 and the embossing lacquer layer 15, that is to say the rear side of the elastically deformable region 4 and the front side of the embossing lacquer layer 15, thus have mutually corresponding surfaces which ensure good mechanical contact.
  • the mechanical, spatial contact between the elastically deformable region 4 and embossing lacquer layer 15 can be promoted by a further, not shown, thin, soft, translucent layer on the back of the elastically deformable region 4 and / or on the front side of the embossing lacquer layer 15. In the simplest case, both surfaces can be even.
  • the contact surface comprises the entire opposing surfaces of elastically deformable region 4 and embossing lacquer layer 15.
  • the elastically deformable region 4 and the embossing lacquer layer 15 can thus each be constructed as a film whose distance can be reversibly changed.
  • Fig. 8 an embodiment is shown in which in turn is an interference thin film 11 on a support substrate 1a.
  • a compressible, elastically deformable region 4 is formed, which is composed of two superimposed, directly adjacent, translucent, compressible, elastically deformable layers 4a and 4b.
  • the two translucent, elastically deformable layers 4a and 4b have a serrated interface 14 at right angles.
  • the two elastically deformable, translucent layers 4a and 4b differ in their refractive indices and / or have a suitable coating at the interface 9, so that in the undeformed state of the elastically deformable layer 4 at the interface 14 the condition for retro-reflection for in the figure from above coming light rays is fulfilled.
  • the layer 4b may be formed of air trapped between the layers 4a and 11 so as to give a large difference in optical refractive index to the layer 4a.
  • the shape of the interface 14 changes, so that in the deformed state, the condition of the retro-reflection is no longer satisfied.
  • an elastically deformable region 4 in the form of a planar layer with spacers 4c is provided on a carrier substrate 1a.
  • the planar layer of the elastically deformable region 4 is coated with a reflective layer 11.3.
  • the partially reflective layer 11.1, the dielectric layer 11.2 and the reflective layer 11.3 lie directly opposite one another, they form an interference thin layer 11, and the visual impression changes markedly.
  • this interference thin film 11 exhibits a color shift effect, so that the visual impression changes at different viewing angles.
  • the spacing of the partially reflective layer 11.1 and the dielectric layer 11.2 of the reflective layer 11.3 is set by means of spacers 4c, which are likewise elastically deformable.
  • spacers 4c On the upper side of the spacers 4c, in turn, a reflective layer 11.3 and additionally an adhesive layer 18 are provided.
  • the adhesive layer 18 likewise acts as a dielectric layer, which is why an interference thin layer results on the upper side even in the undeformed state of the spacers 4c.
  • the spacers 4c are arranged in the form of graphic motifs, symbols or characters, so that a corresponding information results for a viewer in plan view.
  • this information appears as an optically variable layer against a metallic background created by the reflective layer 11.3 on the planar layer of the elastically deformable region 4 outside of the spacers 4c.
  • the spacers 4c With mechanical pressure on the rigid, translucent layer 12, the spacers 4c are compressed so that the entire surface of the security element 2 is an optically variable layer.
  • the adhesive layer 18 applied to the upper side of the spacers 4c a different layer thickness of the dielectric layer results in the regions of the spacers 4c than in the remaining regions.
  • the spacer 4c is the information formed by them, in the form of an optically variable Layer against the background of a different optically variable layer 11, recognizable.
  • the adhesive layer 18 may also be configured opaque and / or colored, which results in a corresponding visual impression of the spacers 4c.
  • the spacers 4c may be arranged outside the region which forms the interference thin layer 11 under mechanical pressure.
  • Fig. 10a shows a schematic side view of a variant of a moiré magnification arrangement and / or a Modulo Mapper, as it PCT / EP 2008/005171 or PCT / EP 2008/005172 is known, the disclosure of which is included in this regard in this patent.
  • the magnification arrangement has a microlens array 19 which focuses on a microimage array 20 with microimages 20a.
  • the enlargement unit also has a translucent, compressible, elastically deformable region 4 in the form of an intermediate layer 21.
  • the microlenses 19a of the microlens array 19 focus on the plane of the microimages 20a of the microimage assembly 20.
  • FIG Fig. 10b In the shown deformed, compressed state of the elastically deformable intermediate layer 21, the distance between the microlens array 19 and the microimage assembly 20 is reduced, so that the microlenses 19a no longer focus on the plane of the microimages 20a.
  • the enlarging effect resulting in the undeformed state in the deformed state of the elastically deformable intermediate layer 21 is canceled by the resulting blurred image.
  • Fig. 10c For example, an alternative construction of a moire magnification arrangement and / or a modulo mapper in an undeformed state of the elastically deformable interlayer 21 is shown.
  • the microlenses 19a do not focus on the associated planes of the microimages 20a.
  • such focusing takes place in a deformed state of the elastically deformable intermediate layer 21, whereby the magnification effect in this exemplary embodiment becomes recognizable only in the deformed state, and thus at and possibly briefly after a mechanical pressure has been exerted.
  • a further embodiment of a moire magnification arrangement and / or a modulo mapper is shown. This comprises two consecutive microimage arrangements 20 and 20 '.
  • the microlenses 19a of the microlens array 19 focus on the planes of the microimages 20a of the front and in the Figure overhead microimage assembly 20.
  • the microlenses 19a of the microlens array focus 19 on the planes of the micro images 20a 'of the viewing direction behind micro-image array 20'.
  • Fig. 11 is a first embodiment of a manufacturing process for producing a coating 3 on an example embossed sawtooth structure with recesses 12 in the foot of the saw teeth 5 outlined.
  • the coating 3 is applied by oblique vapor deposition in the direction of the flanks of the saw teeth 5, as indicated by the arrows in the figure.
  • the tips of the saw teeth each shade the foot region of the sawtooth 5 behind it in the vapor deposition direction, whereby Recesses 12 arise.
  • the coating 3 may be a layer of metal or other material.
  • FIGS. 12a to 12c is a second embodiment of a manufacturing process for producing a coating 3 on an example embossed sawtooth structure with recesses 12 in the foot of the saw teeth 5 outlined.
  • a wash color 22 is applied to the sawtooth structure.
  • the wash color 22 is low-viscosity and therefore deposits only in the foot region of the saw teeth within the sawtooth structure.
  • the wash paint 22 has a suitable surface tension against the material of the saw teeth, which assists the attachment of the wash paint 22 in only the foot areas.
  • the desired coating 3 is applied over the entire surface by vertical evaporation. However, the application of the coating can also be done otherwise.
  • the wash paint 22 has a highly porous surface, which allows a subsequent washing out of the wash paint 22 together with the overlying coating 3.
  • the in Fig. 12c shown coating 3 with recess 12 in the foot region of the saw teeth 5 generated.
  • the use of the wash ink 22 allows in this embodiment, an initially full-surface application of the desired coating 3, which is easy to implement.
  • FIGS. 13a to 13b is a third embodiment of a manufacturing process for producing a coating 3 on an example embossed sawtooth structure with recesses 12 in the foot of the saw teeth 5 outlined.
  • the desired coating 3 is applied over the entire surface.
  • a low-viscosity top coat 23 applied, which accumulates only in the foot areas of the saw teeth 5, which can be additionally supported by a suitable surface tension of the top coat 23 against the coating 3.
  • the cover color 23 is opaque and covers the coating 3 in the foot areas, whereby its optical effect of the coating 3 is suppressed there, which has as a result the same or at least similar effect as the recesses 12 in the embodiments described above.
  • FIGS. 14a to 14c and 15 Two embodiments of a manufacturing method for producing a coating 3 on an embossed sawtooth structure with recesses 12 in the foot of the saw teeth 5 are sketched, the coating 3 is transferred when embossing the sawtooth structure from the die 24 to the edges of the saw teeth.
  • the embossing punch 24 is treated suitably before embossing the sawtooth structure.
  • This may be a metallization transfer in which the coating 3 is a metallization layer.
  • an embossing foil may also be used with particular preference.
  • first embodiment is in a first step ( Fig. 14a ) applied the desired coating 3 over the entire surface of the embossing surface of the die 24.
  • a second, in Fig. 14b illustrated process step the coating 3 of the tips of the saw teeth of the embossing surface of the die 24 again removed. These tips are easily accessible, so the removal can be done by mechanical brushing, as by the brush 25 in the Fig. 14b is indicated. The removal of the coating 3 from the tips is facilitated if it is a slightly cleavable coating.
  • a material for the die 24 is often used a hard paint layer.
  • an additional adhesive layer 26 is applied to the die 24.
  • the adhesive layer 26 remains together with the coating 3 on the embossed structure, that is, the embossed sawtooth structure back. Since the tips of the embossing die come to lie in the foot areas of the saw teeth 5 of the embossing pattern during embossing, the desired recesses 12 are formed there, as shown in FIG Fig. 12c already shown.
  • the desired coating 3 is again first applied over the entire surface of the die 24.
  • a low-viscosity adhesive 27 is applied, which is deposited in the foot areas of the sawtooth structure of the die 24.
  • the die 24 consists of a hard lacquer to which the coating 3, which is a metallization layer, adheres better than on the material of the structure to be embossed.
  • the coating 3 is removed again in the simplest case when removing the embossing die 24 from the embossed structure. In the region of the adhesive 27, however, the coating 3 remains adhered to the embossed structure.
  • the coating 3 remains on the tips of the embossed sawtooth structure, while the coating 3 in the foot areas of the embossed sawtooth structure is removed again, whereby the desired recesses 12 are formed, like this in Fig. 12c is shown.
  • FIGS. 16a and 16b is an embodiment of a manufacturing method for producing microlenses 4e in an elastically deformable Area 4 shown with a coating 11 with uniform layer thickness.
  • a first process step ( Fig. 16a ) are arranged on a translucent, planar layer of an elastically deformable region 4 vertical cylinder 4d at the locations where a microlens to be generated.
  • an interference thin film 11 is applied by perpendicular evaporation on the flat surface of the elastically deformable region 4 and on the end faces of the cylinder 4d. Since the flat surface and the end faces of the cylinders 4d have parallel surfaces and no area is shaded during vapor deposition, vapor deposition creates layers each having uniform layer thicknesses and thus an interference thin film 11 having a uniform optically variable effect.
  • the planar layer of the elastically deformable region 4 and the cylinders 4d which are also part of the elastically deformable region, form a continuous region of the same material.
  • a second process step ( Fig. 16b ) the planar layer and the cylinders 4d are heated so that the elastically deformable region 4 runs.
  • the elastically deformable region 4 consists of a thermoplastic material.
  • the cylinders 4d and the plane structure join and form microlenses 4e below the interference thin film 11 at the positions where the cylinders 4d are disposed.
  • a security element is provided with an elastically deformable region with microlenses 4 e, which carry an optically variable coating in the form of a uniform interference thin film 11.
  • the applied interference thin film may possibly break, which is irrelevant to the color impression.
  • Such bleeding of already coated cylinders 4d to coated microlenses 4e can also be realized in materials that are not elastically deformable.
  • the elastically deformable regions 4 in the various embodiments may contain additional particles, not shown, which are filled with a gas or a liquid and thus resist deformation and possibly compression of the respective elastically deformable region 4 with less mechanical resistance than the remaining material of the elastic deformable region 4.
  • the elastically deformable regions 4 may each also be foamed, whereby the volume of such an elastically deformable region 4 can be additionally increased and this then elastically deformed to a greater extent, in particular can be compressed.
  • the cylinders 4d are made of a material which is elastically deformable differently than the elastically deformable region 4.
  • the cylinders 4d or the region 4 can also consist of a non-deformable material.
  • the material of the cylinder 4d in this case has a lower melting temperature than the region 4, so that only the cylinders 4d melt during heating. Due to the surface tension, the cylinders 4d, similar to a drop of water on a plate, transform into lenticular structures.

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Claims (21)

  1. Elément de sécurité pour un support de données, comprenant
    - une zone élastiquement déformable, et
    - une structure fonctionnelle, qui produit une empreinte visuelle chez un observateur,
    dans lequel la zone élastiquement déformable et la structure fonctionnelle interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une empreinte visuelle de la structure fonctionnelle, qui se différencie de l'empreinte visuelle dans un état déformé de la zone élastiquement déformable, caractérisé en ce que la position spatiale et/ ou l'orientation d'au moins une partie de la structure fonctionnelle dans l'état non déformé de la zone élastiquement déformable se différencie de la position spatiale et/ ou de l'orientation dans l'état déformé de la zone élastiquement déformable et la structure fonctionnelle contient un élément optiquement variable, de préférence une couche mince d'interférence, des pigments en couche mince d'interférence ou des pigments à cristaux liquides, qui est solidement assemblé à la surface de la zone élastiquement déformable.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que la zone élastiquement déformable comprend la structure fonctionnelle.
  3. Elément de sécurité selon la revendication 2, caractérisé en ce que la zone élastiquement déformable présente une structure en forme de couche, une couche en un matériau rigide, qui est mécaniquement assemblée à la zone élastiquement déformable, est disposée sur la zone élastiquement déformable, et la structure fonctionnelle est disposée sur une surface de la couche en matériau rigide, dans lequel cette couche comprend de préférence une multiplicité d'éléments, qui sont inclinables individuellement.
  4. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que la zone élastiquement déformable présente une structure en forme de couche avec une épaisseur de couche variant spatialement, de préférence une structure en dents de scie ou une structure en lamelles, sur les flancs de laquelle la structure fonctionnelle, de préférence stratifiée, est disposée, dans lequel de préférence encore la structure fonctionnelle présente des découpes ou est masquée dans la région du pied de la structure en dents de scie et/ ou les pointes de la structure en dents de scie ou de la structure en lamelles sont solidement reliées les unes aux autres par une couche translucide.
  5. Elément de sécurité pour un support de données, comprenant
    - une zone élastiquement déformable, et
    - une structure fonctionnelle, qui produit une empreinte visuelle chez un observateur,
    dans lequel la zone élastiquement déformable et la structure fonctionnelle interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une empreinte visuelle de la structure fonctionnelle, qui se différencie de l'empreinte visuelle dans un état déformé de la zone élastiquement déformable, caractérisé en ce que lors de l'observation de la structure fonctionnelle dans l'état non déformé de la zone élastiquement déformable il se produit un chemin de lumière, qui se différencie du chemin de lumière dans l'état déformé de la zone élastiquement déformable, dans lequel la structure fonctionnelle comprend un premier élément et un deuxième élément translucide, disposé avant le premier élément dans la direction d'observation, dans lequel le premier élément et le deuxième élément sont espacés l'un de l'autre dans l'état non déformé de la zone élastiquement déformable et sont en contact l'un avec l'autre dans l'état déformé de la zone élastiquement déformable.
  6. Elément de sécurité selon la revendication 5, caractérisé en ce que le deuxième élément, lors de l'écartement du premier élément, est totalement réfléchissant, en particulier rétro-réfléchissant, sur la surface faisant face au premier élément et lors du contact avec le premier élément permet une vue sur le premier élément.
  7. Elément de sécurité selon la revendication 5, caractérisé en ce que le deuxième élément comprend une couche partiellement réfléchissante et une couche diélectrique et le premier élément comprend une couche réfléchissante ou en ce que le deuxième élément comprend une couche partiellement réfléchissante et le premier élément comprend une couche diélectrique et une couche réfléchissante, qui sont disposées l'une par rapport à l'autre, de telle manière que lors du contact entre le premier et le deuxième éléments il se forme une couche mince d'interférence.
  8. Elément de sécurité pour un support de données, comprenant
    - une zone élastiquement déformable, et
    - une structure fonctionnelle, qui produit une empreinte visuelle chez un observateur,
    dans lequel la zone élastiquement déformable et la structure fonctionnelle interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une empreinte visuelle de la structure fonctionnelle, qui se différencie de l'empreinte visuelle dans un état déformé de la zone élastiquement déformable, caractérisé en ce que la zone élastiquement déformable et la structure fonctionnelle sont formées respectivement comme une couche et la zone élastiquement déformable est translucide et est disposée avant la structure fonctionnelle dans la direction d'observation.
  9. Elément de sécurité selon la revendication 8, caractérisé en ce que la zone élastiquement déformable dans l'état non déformé remplit la condition pour une rétro-réflexion et dans l'état déformé ne remplit pas la condition pour la rétro-réflexion.
  10. Elément de sécurité selon la revendication 8, caractérisé en ce que l'élément de sécurité comprend un dispositif de grossissement par effet de moiré ou un mappeur modulo avec une matrice de microlentilles et une matrice de micro-images, dans lequel la structure fonctionnelle comprend la matrice de micro-images et la zone élastiquement déformable forme une couche disposée entre la matrice de microlentilles et la matrice de micro-images, de telle manière que la distance entre la matrice de microlentilles et la matrice de micro-images dans l'état non déformé de la zone élastiquement déformable se différencie de la distance dans l'état déformé de la zone élastiquement déformable.
  11. Elément de sécurité selon la revendication 8, caractérisé en ce que la zone élastiquement déformable présente une structure en forme de couche avec une épaisseur de couche variant spatialement et la structure fonctionnelle forme une couche optiquement variable, dans lequel de préférence la zone élastiquement variable possède une structure en dents de scie et/ ou les pointes de la structure en dents de scie sont solidement reliées par une autre couche translucide.
  12. Elément de sécurité selon la revendication 11, caractérisé en ce que la zone élastiquement déformable porte sur les flancs de la structure en dents de scie au moins localement un revêtement, qui de préférence présente des découpes ou est masqué dans la région du pied de la structure en dents de scie.
  13. Elément de sécurité selon la revendication 8, caractérisé en ce qu'une autre couche translucide en un matériau rigide est disposée avant la zone élastiquement déformable dans la direction d'observation, laquelle est mécaniquement assemblée à la zone élastiquement déformable et présente de préférence une multiplicité d'éléments, qui sont inclinables individuellement.
  14. Elément de sécurité pour un support de données, comprenant
    - une zone élastiquement déformable, et
    - une structure fonctionnelle, qui produit une empreinte visuelle chez un observateur,
    dans lequel la zone élastiquement déformable et la structure fonctionnelle interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une empreinte visuelle de la structure fonctionnelle, qui se différencie de l'empreinte visuelle dans un état déformé de la zone élastiquement déformable, caractérisé en ce que la zone élastiquement déformable et la structure fonctionnelle sont respectivement formées comme une couche, la zone élastiquement déformable est translucide et comprend des microlentilles, et la structure fonctionnelle comprend un revêtement optiquement variable des microlentilles.
  15. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone élastiquement déformable présente lors de la déformation une hystérésis temporelle.
  16. Procédé de fabrication d'un élément de sécurité pour un support de données, comprenant les étapes suivantes:
    - préparer une zone élastiquement déformable,
    - préparer une structure fonctionnelle, et
    - établir la zone élastiquement déformable et la zone fonctionnelle de telle manière qu'elles interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une autre empreinte visuelle de la structure fonctionnelle que dans un état déformé de la zone élastiquement déformable,
    dans lequel la préparation de la zone élastiquement déformable comprend les étapes suivantes:
    - préparer une couche de matière plastique, en particulier une couche de colle, de résine ou de laque d'estampage,
    - estamper la couche de matière plastique à l'aide d'un tampon d'estampage pour la production d'une structure d'estampage dans la couche de matière plastique, et
    - régler l'élasticité et de préférence le comportement à la compression de la couche de matière plastique, de préférence par réticulation, de telle manière que la structure d'estampage soit élastiquement déformable et soit de préférence compressible.
  17. Procédé selon la revendication 16, dans lequel la structure d'estampage et le tampon d'estampage présentent une structure en dents de scie régulière.
  18. Procédé selon la revendication 17, comprenant les autres étapes:
    - déposer sur la structure d'estampage un revêtement produisant une empreinte visuelle, qui présente des découpes ou qui n'est pas actif optiquement dans la région du pied des dents de scie de la structure en dents de scie et qui fait de préférence partie de la structure fonctionnelle et qui comprend de préférence une couche de métallisation, une couche de pigments à cristaux liquides ou une couche de pigments d'interférence en couche mince,
    - soit par:
    - dépôt du revêtement par métallisation oblique de la structure d'estampage en direction des flancs de la structure en dents de scie, de telle manière que les pointes des dents de scie de la structure en dents de scie fassent de l'ombre sur la région du pied de la dent de scie respectivement voisine,
    - soit par:
    - dépôt d'une couleur lavable faiblement visqueuse sur la structure d'estampage,
    - dépôt du revêtement sur toute la surface, et
    - lavage de la couleur lavable,
    - soit par:
    - dépôt du revêtement sur toute la surface sur la structure d'estampage et
    - dépôt d'une couleur couvrante faiblement visqueuse,
    - soit par:
    - dépôt du revêtement sur toute la surface sur le tampon d'estampage,
    - enlèvement du revêtement sur les pointes du tampon d'estampage,
    - dépôt d'une couche de colle sur le tampon d'estampage et
    - transfert du revêtement sur la structure d'estampage lors de l'estampage de la couche de matière plastique,
    - soit par:
    - dépôt du revêtement sur toute la surface sur le tampon d'estampage,
    - dépôt d'un adhésif faiblement visqueux sur le revêtement du tampon d'estampage et
    - transfert du revêtement sur la structure d'estampage lors de l'estampage de la couche de matière plastique.
  19. Procédé de fabrication d'un élément de sécurité pour un support de données, comprenant les étapes suivantes:
    - préparer une zone élastiquement déformable,
    - préparer une structure fonctionnelle, et
    - établir la zone élastiquement déformable et la zone fonctionnelle de telle manière qu'elles interagissent l'une avec l'autre, de telle manière qu'il en résulte dans un état non déformé de la zone élastiquement déformable une autre empreinte visuelle de la structure fonctionnelle que dans un état déformé de la zone élastiquement déformable,
    - préparer une couche plane avec des cylindres disposés perpendiculairement sur celle-ci pour la création de la zone élastiquement déformable, dans lequel la couche et les cylindres se composent d'un matériau plastique thermoplastique translucide identique ou différent, en particulier d'une colle ou d'une laque,
    - déposer une couche mince d'interférence sur la couche plane et les faces frontales des cylindres par métallisation perpendiculaire pour la création de la structure fonctionnelle, et
    - établir la zone élastiquement déformable et la zone fonctionnelle par chauffage de la couche plane et des cylindres, de telle manière que ceux-ci deviennent des microlentilles.
  20. Support de données, en particulier document de valeur, article de marque et analogues, comprenant un élément de sécurité selon l'une quelconque des revendications 1 à 15.
  21. Elément de transfert comprenant un élément de sécurité selon l'une quelconque des revendications 1 à 15, qui est déposé de préférence de façon séparable sur une couche de support.
EP09748243.4A 2008-10-24 2009-10-23 Elément de sécurité avec élément visuel sensible à la pression Active EP2349736B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008053099A DE102008053099A1 (de) 2008-10-24 2008-10-24 Sicherheitselement mit drucksensitivem Erscheinungsbild
PCT/EP2009/007607 WO2010046125A2 (fr) 2008-10-24 2009-10-23 Elément de sécurité avec élément visuel sensible à la pression

Publications (3)

Publication Number Publication Date
EP2349736A2 EP2349736A2 (fr) 2011-08-03
EP2349736B1 true EP2349736B1 (fr) 2018-07-11
EP2349736B2 EP2349736B2 (fr) 2022-01-05

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DE (1) DE102008053099A1 (fr)
WO (1) WO2010046125A2 (fr)

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DE102010031713A1 (de) * 2010-07-21 2012-01-26 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit Kippbild
DE102011121895A1 (de) * 2011-12-21 2013-06-27 Giesecke & Devrient Gmbh Verifikation von Wertdokumenten mit einem Fenster mit optisch wirksamen Mikrostrukturen
WO2013143008A1 (fr) * 2012-03-29 2013-10-03 Orell Füssli Sicherheitsdruck Ag Document de sécurité multicouche avec une cavité
DE102013010941A1 (de) * 2013-06-28 2014-12-31 Giesecke & Devrient Gmbh Sicherheitselement mit adaptiven fokussierenden optischen Elementen
MA42904A (fr) 2015-07-10 2018-05-16 De La Rue Int Ltd Procédés de fabrication de documents de sécurité et de dispositifs de sécurité
DE102016104300A1 (de) * 2016-03-09 2017-09-14 Leonhard Kurz Stiftung & Co. Kg Sicherheitselement sowie ein Verfahren zur Herstellung eines Sicherheitselements
DE102018118473A1 (de) * 2018-07-31 2020-02-06 Bundesdruckerei Gmbh Lichtsteuerfolie, Dokument mit einer Lichtsteuerfolie und Verfahren zur Herstellung eines Dokumentes mit einer Lichtsteuerfolie

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WO2006008531A1 (fr) 2004-07-19 2006-01-26 Cambridge Enterprise Limited Interrogation d'un capteur
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EP1827864B1 (fr) 2004-10-07 2008-08-20 Giesecke & Devrient GmbH Element de securite comportant une couche a variation optique et son procede de production

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FR2698390A1 (fr) 1992-11-20 1994-05-27 Arjo Wiggins Sa Document de sécurité authentifiable par effet piezooptique.
JP2002006280A (ja) 2000-06-27 2002-01-09 Dainippon Ink & Chem Inc 感熱性形状記憶材料を用いた熱可逆性多彩色画像記録媒体およびその画像形成方法
US20050228072A1 (en) 2002-06-17 2005-10-13 Holger Winkler Composite material containing a core-covering particle
WO2005120855A1 (fr) 2004-06-10 2005-12-22 De La Rue International Limited Ameliorations apportees a des dispositifs de securite
WO2006008531A1 (fr) 2004-07-19 2006-01-26 Cambridge Enterprise Limited Interrogation d'un capteur
EP1827864B1 (fr) 2004-10-07 2008-08-20 Giesecke & Devrient GmbH Element de securite comportant une couche a variation optique et son procede de production
WO2008017864A1 (fr) 2006-08-10 2008-02-14 De La Rue International Limited dispositif de sécurité à cristal photonique
US20080182084A1 (en) 2007-01-30 2008-07-31 Ovd Kinegram Ag Security element for safeguarding value-bearing documents

Also Published As

Publication number Publication date
EP2349736A2 (fr) 2011-08-03
WO2010046125A3 (fr) 2010-08-05
EP2349736B2 (fr) 2022-01-05
WO2010046125A2 (fr) 2010-04-29
DE102008053099A1 (de) 2010-04-29

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