EP3098086A1 - Élement de securite piezochrome - Google Patents

Élement de securite piezochrome Download PDF

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Publication number
EP3098086A1
EP3098086A1 EP16001192.0A EP16001192A EP3098086A1 EP 3098086 A1 EP3098086 A1 EP 3098086A1 EP 16001192 A EP16001192 A EP 16001192A EP 3098086 A1 EP3098086 A1 EP 3098086A1
Authority
EP
European Patent Office
Prior art keywords
security element
elastomer
particles
feature
feature area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16001192.0A
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German (de)
English (en)
Other versions
EP3098086B1 (fr
Inventor
Peter Schiffmann
Martin Imhof
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
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Giesecke and Devrient 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.)
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Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP3098086A1 publication Critical patent/EP3098086A1/fr
Application granted granted Critical
Publication of EP3098086B1 publication Critical patent/EP3098086B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials

Definitions

  • the invention relates to a security element for securing valuables, a method for producing such a security element and a data carrier equipped with such a security element.
  • Data carriers such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • the authentication of security elements utilizes various human senses, such as the visual perception of seeing optically variable colors, the auditory perception of hearing the distinctive sound of a banknote substrate, or the tactile perception of feeling elevated stitch patterns on a bill.
  • Interactive security features are particularly interesting as counterfeit protection, because they attract special attention through the involvement of the user and are also particularly easy to memorize through the involvement of several senses.
  • thermochromic security feature for banknotes in which the heat of a fingertip is sufficient to change the color of the banknote at a particular location.
  • thermochromic security features usually only work satisfactorily when the ambient temperature well below the body temperature of the user. If the ambient temperature is too high, the feature is often already triggered or there is no noticeable effect.
  • the object of the invention is to provide a security element of the type mentioned at the beginning, which permits an interactive authenticity check independently of the ambient conditions.
  • a generic security element is provided with at least one feature area comprising an elastomer and a plurality of particles, preferably formed of magnetite and / or superparamagnetic particles, the particles being magnetically magnetizable in position in the elastomer
  • Form of a regular grid have been arranged to form a photonic crystal.
  • the feature area exhibits a first visual appearance without external force, and upon application of tensile and / or compressive force due to a change in lattice spacing of the regular grating of the photonic crystal, exhibits a second visual appearance having a discernible hue change from the first visual appearance.
  • the external force is a mechanical force.
  • the external force is a magnetic force.
  • the feature region generates characteristic reflection colors, which are essentially given by the spacing of the lattice planes of the photonic crystal formed by the particles.
  • the security element is elastically deformed and thereby also changes the color-determining distance of the lattice planes. Because of the elasticity of the elastomer, the security element returns after removing the external forces back to the starting position with the original lattice spacing and thus the original color.
  • the tensile and / or compressive stress can be applied by the user, for example, by folding, buckling or bending of the security element or by local application of pressure, such as with a thumb or index finger. This corresponds in particular to a mechanical force.
  • the particles are magnetically positionable particles which have been magnetically placed in the elastomer in the form of the regular lattice at the time of curing (/ crosslinking) of the elastomer.
  • the relative arrangement of the particles to the elastomer is irreversible.
  • the particles can be arranged with the elastomer by a force - which can also be magnetic - in a different grid spacing. This elastic deformation is naturally reversible.
  • An aid may be, for example, an electromagnet or a permanent magnet in addition to a pin in order to achieve a deformation (by means of tensile and compressive forces) of the security element and thus a change in the original hue.
  • the elastomer allows the magnetizable particles to be moved by a magnetic force of the magnet Magnetic field of their original arrangement, ie without external force, take a different, new arrangement, whereby a color changes is caused.
  • the user can thus interactively trigger a reversible color change of the security element.
  • aids in particular magnets may have a dark color.
  • the aids can have one or more dark or black coating (s), so that a coloring of the elastomer or the security element is not required, as will be explained later.
  • the state without external force is hereinafter also referred to as unloaded state, the state with the application of tensile or compressive forces as a loaded state of the feature area or the security element.
  • the magnetically orientable particles are nanoparticles having a size below 100 nm.
  • the magnetically orientable particles may also be agglomerates of nanoparticles.
  • the nanoparticles have a size below 100 nm, while the agglomerate size is in particular between 50 and 300 nm.
  • the nanoparticles preferably have a size of less than 20 nm, for example from 6 to 12 nm.
  • the magnetically orientable particles are preferably formed from magnetite, paramagnetic particles or superparamagnetic particles.
  • the particles with superparamagnetic properties or with a very low remanence preferably consist of non-magnetically oriented aggregated nano-magnetite particles and / or superparamagnetic particles (eg carbonyl iron).
  • the term magnetically oriented particles in their position covers both individual nanoparticles and agglomerates of nanoparticles.
  • Paramagnets exhibit non-zero magnetization only as long as they are in an external magnetic field.
  • the magnetically alignable particles are thus magnetically magnetizable temporarily.
  • the magnetically-alignable particles forming the photonic crystal are all substantially the same size and are in the range of ⁇ 20%, preferably in the range of ⁇ 10%, around a central size value.
  • the feature area is machine-readable or machine-readable.
  • the color change is detected by means of a sensor in a tester and the reversible deformation of the elastomer via a magnet (electromagnet, permanent magnet), a pressurization via a mechanical plunger, a roller and a Switzerlandbeetzschlagung over a wrap angle or a differential speed in one Transport system takes place.
  • the feature area remains substantially color constant when tilting the security element.
  • the color change caused by the external forces is then easy to recognize and particularly impressive, since it is not superimposed by an optical variability of the security element.
  • the security element may have a homogeneous feature area with a uniform photonic crystal.
  • the feature area will have several subregions with different arrangements of the magnetically alignable particles, the subregions advantageously showing different first visual appearances and / or different second visual appearances.
  • the first and second appearances may each have a hue in the visible spectral range, for example, the reversible hue change between green and blue or between red and green may take place.
  • the reflection color of the photonic crystal is either outside the visible spectral range in the loaded or unloaded state.
  • the feature region then appears colorless, transparent or in a color produced by other colorants in this state, depending on the color of the elastomer.
  • the at least one feature region may preferably have a plurality of partial regions with different deformation properties.
  • a plurality of independent / separate / spaced feature areas may have mutually different deformation characteristics.
  • different deformation properties can be achieved by influencing the Shore hardness or elongation properties of the elastomer by controlling the degree of crosslinking or vulcanization.
  • two partial regions with different Shore hardness or elongation properties can be produced by using two elastomers with different Shore hardnesses or elasticities.
  • a first elastomer having a higher elasticity than the second Elastomer has to be applied in both partial areas.
  • the second elastomer is then applied only in the second portion. Consequently, then the first portion has a higher elasticity than the second portion.
  • this can be achieved by using 0-5% vulcanization accelerator 0-5%, vulcanization retarder and 0-2% plasticizer in Katuschuk.
  • the degree of crosslinking can be influenced by a modulated exposure mask.
  • a modulated exposure mask For this one would apply a (not yet cross-linked) elastomer to a carrier substrate.
  • a first partial area can be networked with a first radiation source and a diaphragm, and then the second partial area can be networked with a second radiation source.
  • two different photoinitiators in an elastomer starting material having different spectral absorption properties e.g., other wavelengths
  • two portions having different hue changes in the case of an external force can be generated by using an elastomer.
  • the elastomer is applied in both partial areas in a first step.
  • the elastomer is applied again, but only in the second subregion. Consequently, the first subregion then has a smaller layer thickness than the second subregion, as a result of which the elongation occurs when external force is applied the sub-areas and thus different color changes are achieved.
  • a carrier substrate may have a varying layer thickness, so that a higher extensibility is present in one area with a layer thickness that is smaller than in another area (with a higher layer thickness).
  • the color change sets earlier, so that according to the layer thickness variation, a pattern / motif is recognizable.
  • a stabilizing foil can be provided. In the area where the stabilizing film is provided, then higher tensile and / or compressive forces must be applied to achieve a color change.
  • the photonic crystal of the feature region reflects light in the infrared spectral range in at least one subregion without external force and reflects light in the visible spectral range, in particular in the case of tensile or compressive forces due to a change in the lattice spacings of the regular lattice of the photonic crystal Redden.
  • the photonic crystal of the feature region reflects light in the visible spectral range, in particular in the blue, in at least one subarea and reflects light in the ultraviolet upon application of tensile or compressive forces due to a change in the lattice spacings of the regular lattice of the photonic crystal spectral range.
  • the hue change perceptible by a human user is in the foreground
  • the hue change also be detected by machine, for example by means of a sensor. This is especially true when the reflection color of the photonic crystal in a state of the feature region is outside the visible spectral range.
  • a sensor can directly detect the IR or UV radiation reflected from the photonic crystal, while a human observer can only indirectly perceive the change in reflection color toward the infrared or ultraviolet, such as by changing the feature area from a colored state to a transparent state.
  • the elastomer is advantageously selected from the group consisting of elastic silicones, acrylates, polyester acrylates, rubbers, polyisobutene, polyurethanes and polyvinyl butoxylates.
  • the offset with the magnetically orientable particles elastomer forms a film whose thickness is below 1000 microns, preferably below 600 microns and more preferably below 300 microns.
  • the minimum thickness of the film is advantageously at least 10 microns.
  • the film has a thickness in the range of 20 ⁇ m to 100 ⁇ m, more preferably in the range of 20 ⁇ m to 50 ⁇ m.
  • the thickness of the film or the elastomer corresponds to the thickness of the document of value, so that the film / the elastomer has neither a significantly higher nor a significantly smaller thickness than the value document.
  • the elastomer is advantageously substantially transparent and colorless, such that the perceived color of the feature region is determined by the reflection color of the photonic crystal.
  • the elastomer comprises one or more layers or one or more coatings.
  • such layers or coatings are arranged on / on the elastomer.
  • the elastomer may have a dark layer / coating, preferably a black layer / coating.
  • Such a dark or black layer / coating preferably serves to provide a good contrast between the color of the photonic crystal and the dark or black layer / coating, so that a viewer can perceive the color or color change of the photonic crystal well.
  • the elastomer may be provided with a dark coating.
  • the elastomer has a first major surface and a second major surface facing each other.
  • a dark layer / coating is disposed on / on the first major surface while a viewer views the elastomer from the side of the second major surface.
  • an adjuvant has one or more dark color (s) or black coating (s)
  • an absorbent / black tool eg, a pen
  • such a dark layer / coating is an elastic layer.
  • the elastic layer has similar or equal deformation properties as the elastomer.
  • the elastic layer may consist of the same (basic) material as the elastomer, with the difference that the elastic layer has no photonic crystals but color pigments or dyes for coloring the layer. For the coloration, for example, carbon black or a mixture of fringe pigments, such as yellow, red and blue, are available to produce a black color impression.
  • the elastomer comprises a translucent interference coating.
  • a translucent interference coating is disposed on the second major surface of the elastomer.
  • a translucent interference coating is a liquid crystal coating.
  • a translucent interference coating is a coating based on interference pigments. In the case of interference pigments, these are incorporated in a binder, wherein the interference pigments do not completely cover the second major surface of the elastomer.
  • the translucent interference coating can be based on so-called STEP pigments.
  • two or more feature areas may be arranged side by side.
  • the elastomers may have one or more mutually different layers / coatings.
  • the layer (s) / coating (s) are arranged on different main surfaces of the elastomers.
  • a layer / coating may be disposed on the first major surface of the elastomer of a first feature region while a layer / coating is disposed on the second major surface of the elastomer of the second feature region adjacent to the first feature region.
  • one or more layers may also comprise elastomers that form photonic crystals, wherein this further elastomer in its visual appearance differs from the (first) elastomer that distinguishes the photonic crystal having the first and second visual appearance.
  • a layer / coating may be provided which reduces the extensibility of the feature area or a portion of the feature area.
  • a stabilizing film may be provided as the layer / coating. In the area where the stabilizing film is provided, then higher tensile and / or compressive forces must be applied to achieve a color change.
  • a layer / coating may be a dark / colored elastomer or elastic film applied to / on a major surface of the elastomer.
  • layers / coatings can be laminated to the elastomer.
  • layers / coatings can be applied to the elastomer by means of a cast coating.
  • layers / coatings can be printed on the elastomer or applied by printing technology.
  • the elastomer may have one or more transparent layers / coatings. Further preferably, the elastomer may have one or more translucent layers / coatings. Further preferably, the elastomer may have one or more colored layers / coatings.
  • the security element may be designed such that a color change due to the described piezochromic effect is visible when viewing the security element from one side or main surface, while a translucent and / or colored coating is visible when viewing the security element from another side or main surface ,
  • the elastomer has, in addition to the magnetically alignable particles, further feature substances, in particular luminescent substances or IR-absorbing substances.
  • the further feature substances preferably do not or hardly influence the hue without visible excitation or the scattering of the elastomer.
  • suitable feature substances the elastomer can in particular be made machine readable.
  • the elastomer may be formed both as a self-supporting film and as a coating on a carrier substrate.
  • a carrier substrate can optionally deducted after a transfer of the security element to a target volume.
  • a carrier substrate may have a varying layer thickness. That that with the same force input, the elongation in one area with a smaller layer thickness is higher than in another area with a higher layer thickness. In the area with the lower layer thickness, the color change sets earlier, so that according to the layer thickness variation, a pattern / motif is recognizable.
  • the magnetically orientable particles are provided with a feature coating which lends the particles luminescence or IR-absorbing properties.
  • the magnetically orientable particles may be provided with a hydrophobic coating, which may be an inorganic coating, an organic coating or a hybrid coating.
  • a hydrophobic coating may in particular be a silane coating
  • the organic hydrophobic coating in particular a layer of halogenated polymers, such as PTFE, PVC, or halogenated acrylates.
  • the magnetically orientable particles can advantageously be equipped with transparent, mechanically acting spacers.
  • the spacers can be based on both an inorganic and an organic coating.
  • the feature area as a whole and / or the above-mentioned subregions with different arrangements of the magnetically alignable particles are preferably in the form of characters, patterns or coding.
  • a functional layer is arranged from the viewing direction below the feature area, which can be influenced by the change in hue of the feature area.
  • a functional layer can be formed, for example, by a UV- or IR-absorbing layer which absorbs UV or IR radiation as long as the photonic crystal does not reflect this radiation but transmits it. In this way, a change in the lattice spacings of the photonic crystal of the feature region can also be detected with the aid of the underlying functional layer.
  • a dark or black coating may be provided below the feature area to increase the visibility of the hue change.
  • the dark or black coating may be over the entire surface or in the form of patterns, characters or a code.
  • the security element in the feature area comprises a further magnetic partial area.
  • the additional magnetic subregion can be provided for an improved magnetic force on the security element, in particular so as to achieve a sufficient force with a smaller external magnetic field.
  • the other magnetic portion has a higher magnetization or magnetizability than the elastomer with the photonic crystal, for example, another material is used and / or a higher concentration of (the) magnetic particles.
  • the further magnetic portion should have a lower elasticity than the elastomer, preferably inelastic. Is the other magnetic part fixed / inelastic, a local additional effect can be observed.
  • the elastomer is deformed more directly next to the fixed, magnetic portion, so locally show a different color effect.
  • the further magnetic portion may be arranged in the same layer as the elastomer or in another layer.
  • the magnetic portion may be provided in the form of a separate motif.
  • the elastomer and the magnetic portion are arranged on a common layer, in particular on a carrier layer or on a laminated layer. More preferably, the magnetic portion is disposed within a region of the elastomer (surrounded by elastomer). Alternatively, the magnetic portion may be disposed laterally on at least one side of the elastomer, preferably on two sides and more preferably around the elastomer.
  • the further magnetic subregion is arranged in a further (own) layer, it can be arranged under a continuous layer with the photonic crystal. If the further magnetic subarea arranged under the elastomer is made opaque, a color effect - viewed from below - can only be seen next to the magnetic subarea. Viewed from above, on the other hand, the entire feature area and its color effect would be visible. If the additional magnetic subregion is configured as an alternative or in addition, a color effect (for both viewing directions) can only be observed laterally of the magnetic subregion.
  • the security element is in particular a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
  • the invention also includes a data carrier with a security element of the type described above.
  • the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a document, a Voucher, a check, a high-quality ticket, but also to act as an identification card, such as a credit card, a bank card, a cash card, an authorization card, an identity card or pass personalization page.
  • the feature area of the piezochromic security element is arranged in a recess of the data carrier, in which the feature area of the security element can be pressurized.
  • the security element is preferably arranged in the recess such that the feature area can be pressurized from one data carrier side and the resulting color change is visually perceptible on the opposite data carrier side.
  • the color change is triggered by pressurization by the user, for example by the user presses with thumb or forefinger in the recess and thereby extends the feature area arranged there at least locally.
  • the security element can be provided as a window film or in a window of a value document.
  • the elastomer preferably has a thickness which corresponds to the thickness of the document of value.
  • the feature area of the piezochromic security element is arranged in a stretchable or bendable area of the data carrier.
  • the color change is in in this case, simply by stretching or bending the volume by the user.
  • the data carrier has tactile relief structures in a partial area and the feature area of the piezochromic security element can be brought into pressure contact with the tactile relief structures by bending, folding, folding or folding the data carrier.
  • the feature area is locally stretched by the tactile relief structures, thereby triggering a local hue change.
  • the feature area is advantageously arranged in the region of a recess or a transparent window, so that the color change can be easily visually perceived.
  • the data carrier additionally has at least one reference color element / solid color element whose color tone corresponds to the color tone of the first or second visual appearance of the feature area.
  • the hue of a reference color element represents a fixed reference point, which makes the hue change of the feature area more easily recognizable, since the human eye is more sensitive to the color differences that occur than to the color change per se.
  • the reference color elements may be formed, for example, by colored print layers or other colored structures.
  • the color of the elastomer or the security element is visible by placing it on a dark background or a black coating on the back of the elastomer.
  • the feature region preferably has partial regions in which the elastomer has different layer thicknesses from one another.
  • different forces are required for a deformation in these subregions, so that there are subregions with different discoloration in the case of (equal) tensile loading / force exertion.
  • the elastomer can be coated on an elastic carrier.
  • the carrier substrate may be an elastic carrier.
  • the elastic support is provided with a dark coating.
  • the elastic carrier is dyed dark.
  • the elastomer is coated in partial areas with mutually different elastic films.
  • a layer / coating may be an elastic film.
  • the elastomer is preferably applied to a carrier substrate or value document substrate by means of casting methods and doctoring and / or application by means of nozzles, and / or by printing technology.
  • the magnetically orientable particles in the elastomer are fixed in their orientation.
  • the magnetic disk and / or the plurality of individual magnets may consist of permanent magnets or of electromagnets.
  • the elastomer is processed in a roll-to-roll process.
  • a method for machine testing of a security element can in the present case be configured advantageously.
  • a piezochromic security element with an elastic feature region for example as described above, can be tested.
  • the detection unit measures the property, such as e.g. a thickness or a length of the feature area in the security element or the security element or the data carrier with security element or a color of the feature area in reflection. In particular, a change of the property (thickness, length, color ...) is detected.
  • the test unit also contains an evaluation unit for the measurement signals / values of the detection unit, the evaluation unit evaluates in particular whether a predetermined property (or a predetermined change of a property) is present.
  • the test can be prepared or accompanied by heating the security element.
  • the security element is characterized by a magnetic Alternating field, which acts on the magnetically oriented particles, heated. Warming changes the rheological properties of the elastomer. This leads, for example, that the desired effects can already be achieved with lower mechanical or magnetic forces, such as thickness change, change in length, color change. Likewise, with the same mechanical or magnetic forces, the lattice spacing change is stronger.
  • the force can also be frequency-dependent, so that the speed of the restoring forces of the elastomer (relaxation time) is taken into account during the test.
  • the material-specific properties of the elastomer or the test element can be tested depending on the temperature with.
  • the step of detecting the security element may be at least twice.
  • the detection can take place for a given, first force action and a predetermined, second force action.
  • FIG. 1 1 shows a schematic representation of a banknote 10 having a piezochromic security element 12 according to the invention in the form of a windowed security thread which protrudes at certain window areas 14 on the surface of the banknote 10 while it is embedded in the interior of the banknote 10 in the areas located therebetween.
  • FIG. 2 shows a cross section through the banknote along the window security thread 12 in the neckline, wherein Fig. 2 (a) the banknote in unfolded condition and Fig. 2 (b) the banknote shows in folded state.
  • the security element 12 in the window areas 14 of the banknote has a first visual appearance, for example appears evenly with the hue green. If the banknote 10 and thus the security element 12 are folded back around a longitudinal axis 16, then the color tone of the security element 12 in the area of the fold 20 changes markedly, the security element appears there blue, for example.
  • the folded state ( Fig. 2 (b) ) contains the security element 12 thus two areas with different appearance, namely first areas 22 away from the fold 20, in which a green appearance is unchanged in the window areas 14, and second areas 24 in the fold 20, in which in the window areas 14 a blue Appearance is visible.
  • FIGS. 3 and 4 schematically shown in cross-section piezochrome film element 30 is formed in a feature area 32 substantially by a colorless elastomer 34, which in the finished security element is physically and / or chemically dried and forms a stable, self-supporting film of a thickness of about 250 microns.
  • a colorless elastomer 34 for example, an elastic silicone can be used.
  • a multiplicity of magnetically alignable particles 36 specifically magnetite, paramagnetic and / or superparamagnetic particles, were incorporated into the not yet cured elastomer 34 during the production of the film element 30.
  • nanoscale magnetites with a diameter of about 50 nm in a concentration of about 5% were incorporated into the silicone for this purpose.
  • the particles 36 arrange themselves in the weak magnetic field of an external magnet 40 (dashed in FIG Fig. 3 ) in the form of a regular grating and form a photonic crystal in the surrounding elastomer 34.
  • the elastomer 34 is dried with the magnetic field applied and the spatial arrangement of the particles 36 and the photonic crystal fixed so that the photonic crystal is retained even after removal of the external magnet 40.
  • the feature region 32 When viewed, the feature region 32 generates reflection colors characteristic of the photonic crystal, which are substantially given by the distance d of the lattice planes 38 of the particle assembly. In the embodiment, the feature area appears in supervision about green. By appropriate selection of the magnetic field applied when the elastomer 34 is dried, the visual impression of the feature region 32 can be adjusted as desired within wide limits.
  • the feature region 32 can also have several subregions with different arrangements of the magnetically alignable particles. For example, local different strong magnetic fields lead to locally different spacings of the lattice planes 38 and thus to different reflection colors of the feature region 32 during drying. These different partial regions, like the entire feature region 32, can be in the form of patterns, characters or a coding.
  • the piezochromic film element 30 is now subjected to tensile or compressive forces, as in Fig. 4 As shown by the example of tensile forces 42, the elastic properties of the elastomer 34 allow for a strong elastic deformation of the security element 30. Since the volume of the elastomer 34 is substantially retained during deformation, an extension in one spatial direction is made by corresponding shortenings in the other spatial directions balanced. If the film element 30, for example, as in Fig. 4 stretched in a direction 42 in the plane of the security element, so the height of the elastomer and thus the distance d of the lattice planes 38 decreases accordingly.
  • the film element 30 Since the reflection color is determined essentially by the spacing of the lattice planes 38, the film element 30 which is subjected to tensioning acts Fig. 4 a reflection color of shorter wavelength and appears blue, for example. After completion of the Glaskraftbeetzstoffung the film member 30 returns due to the elastic properties of the elastomer 34 in the starting position of Fig. 3 back and then shows the original green appearance again.
  • deformation of the piezoelectric film element 30 can be generated not only by a tensile load 42 in the plane of the security element, but also by a compressive load 44 perpendicular to the plane of the security element. In this way, pressure forces can lead to color shifts to shorter wavelengths, as explained below with reference to a further embodiment.
  • the lattice spacings of the particles 36 in the elastomer 34 may in particular be selected such that the reflection condition is satisfied either only in the unloaded state or loaded state only for light outside the visible spectral range.
  • the photonic crystal of the film element 30 shown above without external force ( Fig. 3 ) Reflect light in the infrared spectral range and in the tensile load state ( Fig. 4 ) reflect light in the visible spectral range due to the smaller spacing of the lattice planes 38. Since the elastomer 34 itself is colorless and the photonic crystal formed by the particles 36 in the unloaded state reflects infrared light, the feature region 32 initially appears colorless.
  • the film element 30 may be formed so that the photonic crystal without external force ( Fig. 3 ) Reflected light in the visible spectral range and in the tensile load state ( Fig. 4 ) reflects 38 light in the ultraviolet spectral range due to the smaller spacing of the lattice planes.
  • the feature area in the unloaded state initially appears in color, for example blue.
  • the reflection shifts to the ultraviolet and the loaded areas of the feature area 32 appear colorless to the viewer.
  • the subject initially visible appears to disappear under tensile stress and to reappear when the tensile load ceases.
  • the disappearance and reappearance of the motif can be triggered interactively.
  • reference color elements When using the piezochromic security element on a document of value or other data carrier reference color elements may additionally be provided, which reproduce the unloaded starting color tone or hue when subjected to tensile or pressure.
  • reference hue of the reference color elements By the reference hue of the reference color elements, the hue change of the piezochromic security element can be made even more noticeable.
  • the viewer's attention is directed even more to the security element and a lack of color change made conspicuous.
  • FIG. 5 shows an embodiment in the form of a passport book 50, in the fold 52 a piezochromes film element 30 of the type described above is arranged.
  • a piezochromes film element 30 of the type described above is arranged.
  • this green color is picked up by a first reference color element 54 arranged in the immediate vicinity of the fold 52 on the inside 56 of the passport book 50.
  • the reference color element 54 may be, for example, an imprinted green pattern element.
  • the security element 30 is stretched and the feature area 32 therefore appears with its second visual appearance, in the exemplary embodiment approximately blue.
  • This blue color is picked up by a second reference color element 58 arranged in the immediate vicinity of the fold 52 on the outside 55 of the passport book.
  • the reference color element 58 may be, for example, an imprinted blue pattern element.
  • the user need not know that the sheet member 30 shows a hue change from green to blue, it is sufficient to detect the color match or mismatch of the feature portion 32 with the reference color members 54, 58.
  • Fig. 6 is a passbook 60 with a responsive to pressurization piezochromic film element.
  • the upper cover 62 of the passport passport provided with a recess 64 which is closed on the inside 66 of the book cover with a piezochromic film element 30 of the type described above.
  • the opposite inner side 68 of the passport is provided with tactile structures 70 by embossing or printing, which are thus arranged on the inner side 68 are that the recess 64 comes to lie with the film element 30 when folding the passbook 60 on the tactile structures 70.
  • the tactile structures 70 may appear red and are in the form of a motif, such as a graphic pattern or lettering.
  • the film element 30 appears green as described above in the unloaded state and blue in the loaded state.
  • the piezochromic film element 30 is pressed onto the tactile structures 70 and thereby pressurized and locally stretched in the region of the relief-like elevations of the tactile structures. In these stretched areas 72, the color tone of the film element therefore changes from green to blue, while the green color is retained outside the elevations of the tactile structures.
  • the motif formed by the tactile structures 70 which appears red in the unfolded passbook, is visible even after the passbook 60 has been folded open by the recess 64, but then appears blue against a green background.
  • FIG. 7 (a) shows an identification card 80, such as an identification card, bank card, credit card or driver's license in cross-section
  • Fig. 7 (b) shows the same map 80 in supervision.
  • the two outer layers 82 are recessed in a partial region, for example in the form of a circular recess 86 with a diameter of approximately 15 mm.
  • a piezochromic film element 30 of the type described above is arranged in the middle layer 84 and clamped with its edge between the two outer layers 82.
  • the film element 30 appears green. If a user presses, for example, with the index finger or thumb from below against the film element 30 (pressure load 88), then the film element 30 is pressurized and locally stretched because of the clamping of the edges. When viewing the recess 86 from above, so the pressure load 88 opposite card page, the viewer 90 then a color change from green to blue visible.
  • FIG. 7 (a) shows the appearance of the card 80 in the unloaded state, the supervision of Fig. 7 (b) in the pressurized state with triggered safety element.
  • a uniform blue color impression will generally not be established in the recess since the amount of compressive stress increases from the edge of the recess 86 toward the center.
  • the film element 30 therefore appears green at the edge of the recess 64 and blue in the center of the recess.
  • FIG. 8 11 shows a schematic sectional view of a security element 800 having a feature area 810 with elastomer 802 and photonic crystals embedded therein (not shown) according to an embodiment.
  • the elastomer 802 is formed as a coating on a carrier substrate 806 in this embodiment.
  • a carrier substrate 806 may optionally be withdrawn after a transfer of the security element to a target medium.
  • the carrier substrate 806 has first and second major surfaces HF1T, HF2T.
  • the illustration of adhesive layers and / or release layers has been omitted and are not shown.
  • the security element 800 may include further layers disposed on / on the elastomer 802 and the carrier substrate 806, respectively are.
  • the elastomer 802 may have further color layers on the first major surface HF1T, for example, the dark layer 804 may be disposed between the elastomer 802 and such other color layers.
  • the elastomer 802 has a first major surface HF1E and a second major surface HF2E facing each other.
  • a dark layer / coating 804 is disposed on / on the first major surface HF1E of the elastomer. An observer may look at the elastomer 802 from the side of the second major surface HF2E, i. from the direction BR, to perceive a change in color with external forces.
  • the dark layer / coating 804 is an elastic layer.
  • the elastic layer 804 has similar or equal deformation properties as the elastomer 802.
  • the elastic layer 804 may be made of the same (basic) material as the elastomer 802, with the difference that the elastic layer 804 has no photonic crystals but color pigments or dyes for coloring the layer.
  • color pigments or dyes for coloring the layer.
  • carbon black or a mixture of fringe pigments such as yellow, red and blue, are available to produce a black color impression.
  • a translucent interference coating 808 may be applied to the second major surface HF2E of the elastomer 802.
  • a viewer may perceive a blend color of the color of the photonic crystal of the elastomer 802 and the color of the translucent interference coating 808.
  • a layer / coating (not shown) may be provided which reduces the extensibility of the feature area or a portion of the feature area.
  • a stabilizing film can be used as the layer / coating. In the area where the stabilizing film is used, then higher tensile and / or compressive forces must be applied to achieve a color change.
  • a stabilization foil could be applied to one of the main surfaces HF1T, HF2T of the carrier substrate 806.
  • such a stabilizing foil could be applied on the main surface HF1E of the elastomer 802 or on the layer 804.
  • a layer may be provided with a further elastomer which forms a photonic crystal.
  • This layer may be disposed on / on the opaque layer 804 so that the opaque layer 804 is between the elastomer 802 and the layer with the further elastomer (not shown).
  • the visual appearance differs from the elastomer 802 and the other elastomer.
  • FIG. 9 shows a schematic sectional view of a security element 900 with two feature areas 910a, 910b.
  • Feature regions 910a, 910b include elastomers 902a, 902b and photonic crystals (not shown) embedded therein, according to one embodiment.
  • the elastomers 902a, 902b is formed as a coating on a carrier substrate 906 in this embodiment.
  • a carrier substrate 906 may optionally after a transfer of the security element on to deduct a target volume.
  • the carrier substrate 906 has a first and a second main surface HF1T, HF2T.
  • the elastomers 902a, 902b have a first major surface HF1Ea and HF1Eb and a second major surface HF2Ea and HF2Eb, respectively, which face each other.
  • a dark layer / coating 904a is disposed on / on the second major surface HF2Ea of the elastomer 902a.
  • An observer can not look at the elastomer 902a from the side of the second major surface HF2Ea, i. from the perspective BR1.
  • a viewer may look at the elastomer 902a from the side of the first major surface HF1Ea, i. from the viewing direction BR2, in order to perceive a color change with external forces.
  • the second feature area 910b is analogous to FIG. 8 explained.
  • the feature areas 910a, 910b may directly adjoin one another, as in FIG FIG. 9 shown or at a distance from each other.
  • the carrier substrate 906 may have a varying layer thickness, as in FIG Fig. 9 shown by way of example.

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EP16001192.0A 2015-05-27 2016-05-25 Element de securite piezochrome Not-in-force EP3098086B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015006531.9A DE102015006531A1 (de) 2015-05-27 2015-05-27 Piezochromes Sicherheitselement

Publications (2)

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EP3098086A1 true EP3098086A1 (fr) 2016-11-30
EP3098086B1 EP3098086B1 (fr) 2018-03-14

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EP16001192.0A Not-in-force EP3098086B1 (fr) 2015-05-27 2016-05-25 Element de securite piezochrome

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EP (1) EP3098086B1 (fr)
DE (1) DE102015006531A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3332982A1 (fr) * 2016-12-09 2018-06-13 Giesecke+Devrient Currency Technology GmbH Élément de sécurité pourvu de marques luminescentes
CN112946788A (zh) * 2021-02-02 2021-06-11 大连理工大学 一种基于一维光子晶体的应力应变比色传感膜及制备方法
CN114236811A (zh) * 2021-12-20 2022-03-25 北京京东方技术开发有限公司 一种反射型电致变色材料、显示装置、制作及驱动方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016008584A1 (de) * 2016-07-13 2018-01-18 Giesecke+Devrient Mobile Security Gmbh Karte, insbesondere Datenträgerkarte

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710508A1 (fr) * 1994-11-04 1996-05-08 Basf Aktiengesellschaft Procédé pour fabriquer des revêtments ayant des effets optiques tri-dimensionnels
EP1972463A2 (fr) * 2007-03-13 2008-09-24 Giesecke & Devrient GmbH Elément de sécurité
WO2010115928A2 (fr) * 2009-04-07 2010-10-14 Sicpa Holding Sa Element piézochrome de sécurité

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710508A1 (fr) * 1994-11-04 1996-05-08 Basf Aktiengesellschaft Procédé pour fabriquer des revêtments ayant des effets optiques tri-dimensionnels
EP1972463A2 (fr) * 2007-03-13 2008-09-24 Giesecke & Devrient GmbH Elément de sécurité
WO2010115928A2 (fr) * 2009-04-07 2010-10-14 Sicpa Holding Sa Element piézochrome de sécurité

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3332982A1 (fr) * 2016-12-09 2018-06-13 Giesecke+Devrient Currency Technology GmbH Élément de sécurité pourvu de marques luminescentes
CN112946788A (zh) * 2021-02-02 2021-06-11 大连理工大学 一种基于一维光子晶体的应力应变比色传感膜及制备方法
CN112946788B (zh) * 2021-02-02 2023-03-14 大连理工大学 一种基于一维光子晶体的应力应变比色传感膜及制备方法
CN114236811A (zh) * 2021-12-20 2022-03-25 北京京东方技术开发有限公司 一种反射型电致变色材料、显示装置、制作及驱动方法

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DE102015006531A1 (de) 2016-12-01

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