EP2576194A1 - Élément de sécurité à structures de guidage de lumière - Google Patents

Élément de sécurité à structures de guidage de lumière

Info

Publication number
EP2576194A1
EP2576194A1 EP11721426.2A EP11721426A EP2576194A1 EP 2576194 A1 EP2576194 A1 EP 2576194A1 EP 11721426 A EP11721426 A EP 11721426A EP 2576194 A1 EP2576194 A1 EP 2576194A1
Authority
EP
European Patent Office
Prior art keywords
security element
element according
layer
light
waveguide
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.)
Withdrawn
Application number
EP11721426.2A
Other languages
German (de)
English (en)
Inventor
Matthias Müller
Gottfried Brandstetter
Jürgen Keplinger
Marco Mayrhofer
Martin Bergsmann
Klaus Schmidegg
Stephan Trassl
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.)
Hueck Folien GmbH
Original Assignee
Hueck Folien GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hueck Folien GmbH filed Critical Hueck Folien GmbH
Publication of EP2576194A1 publication Critical patent/EP2576194A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00663—Production of light guides
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Definitions

  • the invention relates to an optical security element that is visually or mechanically recognizable when excited by light, wherein the location of the coupling and decoupling of the light is not identical.
  • Security elements in particular strip or thread-like security elements, but also security elements of other formats are often provided with visually recognizable security features that have defined optical characteristics.
  • Such security features are, for example, optically active structures, such as diffraction gratings, diffraction structures, surface reliefs, kinegrams and the like, in particular holograms in which only under certain reflection conditions defined, embossed in a lacquer layer structures, images, lines, symbols, letters, numbers, logos and the like become visually recognizable in a characteristic manner.
  • optically active structures such as diffraction gratings, diffraction structures, surface reliefs, kinegrams and the like
  • holograms in which only under certain reflection conditions defined, embossed in a lacquer layer structures, images, lines, symbols, letters, numbers, logos and the like become visually recognizable in a characteristic manner.
  • EP-A 0 330 733 discloses security elements having luminescent features that become detectable upon excitation by light of defined wavelength (e.g., UV or IR radiation). The presence of such a feature can also be demonstrated in the daily handling of value documents with simple aids such as a UV lamp.
  • defined wavelength e.g., UV or IR radiation
  • EP-A 1 558 449 discloses, for example, optically variable security features which, due to a special structure of reflection layers, intermediate layers and, for example, metallic layers, produce different color impressions from different angles. The color change, which usually takes place at a defined angle, can be verified without further aids.
  • Optically active features such as holograms or optically variable elements are visible at the points where the light meets directly on the security feature, so for example in a banknote with a window thread at the points where the thread is not covered with paper, or on the surface of a security element that on a document of value is applied.
  • a security thread containing fluorescent features is excited locally with light of a suitable wavelength (eg, in the ultraviolet or infrared spectral range)
  • the fluorescent effect will be visible, for example, by the emission of visible light at precisely the point where the exciting radiation impinges.
  • WO 2004/062942 discloses a security feature consisting of a transparent layer which has a suitable refractive index and a suitable thickness in order to function as a waveguide and which has at least one photoluminescent component over its entire surface. At least one surface of the waveguide layer is provided with a pattern which inhibits waveguiding in this area and allows the light to exit at the surface. If, for example, light is coupled into the waveguide on the side of the value document, the pattern becomes visible. From WO 03/059643 a diffractive security element is known, which is divided into two sub-areas, which has an optically active structure at interfaces embedded between two layers of a laminate of plastic. In this case, at least the base layer of the layer composite to be illuminated is transparent.
  • the optically active structure has as its basic structure a zero-order diffraction grating with a period length of at most 500 nm.
  • an integrated optical waveguide with a defined layer thickness of a transparent dielectric is embedded between a base layer and an adhesive layer of the layer composite, wherein the profile depth the optically active structure is in a predetermined ratio to the layer thickness.
  • the security element produces diffracted light when illuminated with white incident light in the zeroth diffraction order.
  • EP 0 047 326 A1 discloses an identity card which contains information in holographic form.
  • the badge is layered and includes a substrate having a planar optical waveguide and a photosensitive layer deposited thereon.
  • the photosensitive layer serves to record a plurality of holograms and comprises at least one light coupler. By combining the light guided in the waveguide and an incident light beam, the hologram is exposed, which can only be read out again when the coupler is illuminated with the associated pattern.
  • WO 2006/056089 discloses a security document in which a light source is provided, and a light processing device in the form of a hologram, which processes the light of the light source by deflecting, reflecting, polarizing and / or partially absorbing it.
  • a value or security document comprising a document body with a top, wherein formed in the document body a Lichtleit Cook for guiding light in a plane which is substantially parallel to the top, via total reflection at boundary layers of the Lichtleit Cook is, wherein the boundary layers have local modifications, so that at points of local modifications, a coupling out of guided in the light guide structure light from the light guide structure is promoted, resulting in a light emission through the top of the document body.
  • the object of the invention was to provide a security element in which the location of the excitation and the occurrence of an optical effect are different from each other and which has an increased security against counterfeiting the prior art.
  • the invention therefore provides a security element comprising a carrier substrate, at least one cladding layer and a waveguide layer, characterized in that the waveguide layer has at least one region in which light is guided both laterally and vertically.
  • Three layers form the basic structure of a waveguide.
  • the refractive index of the cladding layers be less than that of the core layer.
  • Fiber optic cables which are used today for data transmission, work on the same principle.
  • FIGS 1 and 2 show the basic structure of the security element.
  • the waveguide layer extends over the entire surface of the substrate, this is referred to as a layer waveguide (FIG. 1 a) in which the light can equally propagate in the plane of the waveguide layer in all directions.
  • a layer waveguide (FIG. 1 a) in which the light can equally propagate in the plane of the waveguide layer in all directions.
  • the cladding layers 2, 4 can also be achieved that the light is guided laterally in the plane of the waveguide layer, so the light propagation is also limited laterally.
  • the lateral guidance of the light takes place in the same way via total reflection on the side walls of the web, which results from the refractive index contrast to the surrounding medium on all sides (FIG. 1 b).
  • the two above cases can be combined as shown in FIG. 1 c), so that the ridge waveguide acts more or less on the waveguide layer rests.
  • the light can, in principle, propagate throughout the entire plane, more specifically However, coupling into the area of the attached ridge waveguide, the light is guided primarily in the region of the ridge waveguide both laterally and vertically. The losses then depend to a great extent on the ratio of the web thickness to the thickness of the remaining waveguide layer. The thinner the waveguide layer outside the web, the better the lateral guidance of the light in the area of the web.
  • a ridge waveguide is illustrated in Fig. 2 in cross section.
  • a cladding layer 2 is applied in a first step and provided with an embossment 6, for example in the form of depressions.
  • the waveguide is completed by the cladding layer 4, which reduces the losses of light upwards.
  • the cladding layer can also, as shown in Fig. 1 c), the waveguide layer be embossed.
  • At least one of the cladding layers or even both cladding layers can be formed by a carrier substrate.
  • the embossing 6 is used in the example of Fig. 2 for the production of the actual ridge waveguide.
  • the cross section of the ridge waveguide can e.g. circular, rectangular, trapezoidal or be designed differently depending on the requirements.
  • embossing is suitably designed, various other, e.g. diffractive, diffuse scattering or steering functions can be realized.
  • a particularly favorable form of embossing is a so-called grating coupler.
  • a grating coupler initially has the task of deflecting incoming light through the upper cladding layer or through the substrate and the lower cladding layer in such a way that it can propagate in the waveguide.
  • a grating coupler works the same way in the opposite direction, ie guided in the waveguide light can be deflected out of the plane of the waveguide by means of a grating coupler and made accessible to the viewer.
  • the grating has fine structures whose structure size is in the range of the wavelength of the light to be transmitted, ie in the range of 200-2000 nm.
  • the grid may, for example, have a periodic structure. It can also consist of several subregions with different periodic structures or with locally changed periodic structures.
  • the active area of the grating may be e.g. be designed in the form of lines, arches, symbols, signs, geometric figures, etc. If the grating is used for decoupling, then this macroscopic structure is visible to the viewer when the security element is verified.
  • an additional layer having a refractive index higher than that of the waveguide layer may be situated between the embossing of the cladding layer and the waveguide layer. This may be necessary, for example, to increase the efficiency of a grating coupler and to increase the amount of light that is coupled into and out of the optical waveguide in the optical waveguide.
  • This layer with a higher refractive index can consist of a lacquer or polymer, a lacquer or polymer with inorganic, high refractive index pigments (for example Ti0 2 or Zr0 2 ), or an inorganic high refractive index (HRI) layer.
  • the layer with a higher refractive index preferably consists of an inorganic layer of metal oxides or sulfides, for example of TiOx, SiO, ZrO 2 , ZnS.
  • Carrier foils for example preferably come as flexible carrier films, for example from PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM as carrier substrate for the security element according to the invention , ABS, PVC, PTFE, ETFE (ethylene tetrafluoroethylene), PFA (tetrafluoroethylene-perfluoropropyl vinyl ether-fluorocopolymer), MFA (tetrafluoromethylene-perfluoropropylvinylether- Fluorocopolymer), PTFE (polytetrafluoroethylene), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and EFEP (ethylene-tetrafluoroethylene-hexafluoropropylene fluoropolymer).
  • the carrier films preferably have a thickness of 5 to 700 ⁇ m, preferably 5 to 200 ⁇ m, particularly preferably 5 to 50 ⁇ m.
  • a first cladding layer is first applied to the carrier foil. Above all, this layer must have a very smooth surface in order to avoid losses in the finished waveguide due to scattering at a roughness or waviness of the interfaces as far as possible.
  • the refractive index of the cladding layer must be matched to the refractive index of the core layer.
  • the cladding layer is made of a material that has a lower refractive index compared to the waveguide layer.
  • the absolute refractive index of the cladding layer is of subordinate importance, but is preferably in the range of 1.3 to 2.0, more preferably in the range of 1.4 to 1.7.
  • radiation-curable coating systems based on a polyester, an epoxy or polyurethane system which have one or more layers are used for the embossed cladding layer 2 and possibly the second cladding layer 4
  • Photoinitiators may contain, which may optionally initiate a curing of the paint system to varying degrees, even at different wavelengths, in question.
  • the thickness of the cladding layers is preferably in the range 1 to 100 ⁇ , particularly preferably in the range 1 to 10 ⁇ .
  • the embedded waveguide layer or waveguide structure makes it possible to direct the light in the security element in such a way that it exits again at a location of the security element that is different from the entry location.
  • FIG. 3 shows the cross section of an exemplary embodiment of the security element according to the invention, which has the above-described waveguide structure consisting of substrate 1, lower cladding layer 2 with embossings 6, waveguide layer 3 and upper cladding layer 4.
  • the embossments form at mutually different locations a coupling grating coupler 7 and a decoupling grating coupler 8.
  • the lamp 9 emits, for example, light of a certain wavelength, which lies in the visible spectral range.
  • Fig. 4 is shown in plan view.
  • the macroscopic structure in the case of the example in FIG. 4 shows the number "100" and can represent, for example, the denomination of a banknote in which the security element is embedded or on which the security element 11 is applied.
  • Fig. 5 shows an embodiment in which the security element 1 1 is applied to the surface of a banknote 12 and in which the grating coupler 7 is overprinted with a printing ink 13, which has the properties of a color filter. If one illuminates the banknote 12 with polychromatic (eg white) light at the location of the grating coupler 7, the light passes First, the color filter 13, so that only a certain spectral range of the incident light (eg, red light) reaches the grating coupler.
  • polychromatic eg white
  • the color filter is designed so that the resulting color is exactly the base color of the Banknote (eg red) and thus a clear assignment of the feature to the value of the respective banknote is possible. This effect can also be quickly verified by non-professionals using a simple tool (lamp) .
  • the color filter effect can also be achieved by the grating coupler itself, when it filters out a limited wavelength range by special design of incident polychromatic light.
  • locally fluorescent elements are integrated in the waveguide layer. If the fluorescent element 14 is now excited by light having a wavelength ⁇ , the fluorescent element emits light having the wavelength ⁇ 2 . In this case, ⁇ 2 depending on the material used be greater or smaller than ⁇ . The emitted light is now guided within the waveguide structure and strikes the fluorescent element 15, which is in turn excited by ⁇ 2 to fluoresce and emits light having a wavelength ⁇ 3 , which is visible to the viewer 10. Since the upper cladding layer is generally made of a transparent material, the fluorescence of the fluorescent element 14 ( ⁇ 2 ) is also visible at the same time. With appropriate design, it is even conceivable that a local excitation of the fluorescent element 15 with ⁇ leads to no fluorescence, whereby the security can be further increased.
  • Both up-conversion ( ⁇ 2 > ⁇ ) and down-conversion ( ⁇ 2 ) materials can be used as the fluorescent material in the range of 14 and 15. It is also possible to use fluorescent material which can be used in the case of Excitation with different wavelengths shows different fluorescences, for example, one of these fluorescences excites in the decoupling range no further fluorescence of the element 15, the other fluorescence, however, shows a fluorescent effect.
  • the fluorescent elements can either be generated directly when the waveguide layer is applied, for example by printing a corresponding color, or subsequently by applying or impressing at defined positions.
  • scattering elements pigments, powders, glass beads, etc.
  • the efficiency of these scattering centers is lower than that of specially prepared grating couplers and the scattering is diffuse.
  • Security features are usually in the form of threads or strips, ie one side (parallel to the direction of travel) is significantly longer than the second.
  • the waveguide regions are therefore present in the longitudinal direction of the security feature, but other orientations are also possible at any angle to the longitudinal direction.
  • the more the waveguide region is oriented in the longitudinal direction of the security feature the greater the possible maximum distance between the point of entry and exit of the light.
  • the design may be chosen so that the light spans exactly one length or width of the value document.
  • the incident light can also be coupled in or out over the side edge of the thread when the thread is exposed on at least one side edge of the paper.
  • the decoupling can take place on both sides of the value document. This will be achieved either by a single grating coupler deflecting the light on both sides, or by two grating couplers attached to respective opposite interfaces of the waveguide layer, or by scattering or fluorescent elements passing through the transparent support film (FIG. n) are visible (Fig.10).
  • the window area is suitable as the exit area for the two-sided extraction of the light.
  • the decoupling can be done, for example, by any of the methods already mentioned, which can be arranged in the form of letters, characters, symbols, images, lines, logos and the like.
  • the coupling elements are preferably completely or almost completely transparent in the unlit state.
  • the waveguide layer is made of a material that has a higher refractive index compared to the cladding layers.
  • the refractive index contrast may be in the range of 0.001 to 2.0, preferably in the range of 0.01 to 0.5.
  • the Waveguide layer can on the one hand consist of highly transparent lacquer layers, but in special cases also of inorganic layers, which are produced for example by vapor deposition.
  • These inorganic layers may be, for example, oxides or fluorides of metals such as such compounds of Ta, Zr, Ti, Al, Mg, Ba, Ca or Si, and the like.
  • the waveguide varnish may be a high-index varnish.
  • any systems in which the binders are completely dissolved and therefore highly transparent and purely representable suitable are known to the person skilled in the art, among others also soluble paint systems based on polyester or nitrocellulose and the like.
  • the ridge waveguide can be formed by a local modification of the refractive index.
  • Such local modifications can be made for example by laser treatment, electron beam or UV exposure.
  • the photochemical reaction of thiocyanates to isothiocyanates is used for surface modification of polymers.
  • This reaction is due to the isomerization of SCN groups to NCS groups.
  • the gas phase reaction with amines eg with propylamine
  • This reaction transforms the reactive NCS groups into stable thiourea groups.
  • the absolute refractive index of the waveguide layer is of subordinate importance, but is preferably in the range of 1.5 to 2.5, more preferably in the range of 1.5 to 1.8.
  • the layer thickness of the waveguide layer is 0.1 to 100 ⁇ m, preferably 0.1 to 50 ⁇ m, particularly preferably 0.1 to 10 ⁇ m.
  • the waveguide layer can also be embossed.
  • the structure can optionally be laminated by means of a laminating adhesive against a further carrier substrate 1a.
  • a laminating adhesive against a further carrier substrate 1a.
  • the functionality of the security element essentially corresponds to the structure shown in FIG.
  • the laminating adhesive in this embodiment can perform the function of either the waveguide layer 3 or a cladding layer (2 or 4), if its optical properties meet the above requirements. Otherwise, the laminating adhesive may be an additional layer in the film structure, which lies for example between the carrier substrate 1 and the embossed cladding layer 2 or between the carrier substrate 1a and the second cladding layer 4.
  • the layer thickness of the laminating adhesive is 1 to 100 ⁇ m, preferably 1 to 10 ⁇ m.
  • connection of the two carrier substrates can take place by means of a register-precise laminating process.
  • a suitable method is described in EP-A 1 318 016.
  • FIG. 8 shows the top view of a value document in which a security element 16 is partially embedded.
  • the security element is visible in two windows 17, 18 of the value document on its surface.
  • a grating coupler in the form of a rectangle over which light can be coupled into the security element.
  • a second grating coupler 8 in the form of a lettering "100" can be seen, via which the light is decoupled again.
  • the cross-sectional view of the value document in the region of the window 17 is shown in FIG. 9.
  • the security element is unilaterally exposed in this window, ie the security element is not covered on the exposed side with paper fibers. On this page 9 light can be coupled with a light source.
  • the security element In the region of the window 18, the security element is exposed on both sides, as shown in Fig. 10. That is, a viewer can see in this area from both sides directly to the security element.
  • the light exiting can be seen on both sides of the value document by an observer (10 or 10a).
  • the window appears almost completely transparent due to the high transparency of the core or antelope layers and the suitable matching of the refractive indices.
  • the security feature is inserted into the substrate in register with the windows, so that the coupling and decoupling areas always lie in the region of the window.
  • Such a method is described for example in WO 2004/050991.
  • a plurality of waveguides may be arranged in parallel, or lie in different planes of the security element and reappear at different locations (eg in different windows) of the security feature.
  • Fig. 1 1 shows such an expression of the security element according to the invention, in which case instead of a single ridge waveguide 5, two separate ridge waveguides 5a and 5b are introduced in the security element. Both ridge waveguides guide the light from the coupling-in region 7 to different outcoupling regions 8a and 8b, which lie in different windows (18 and 19 respectively) of the value document. If you now illuminate the coupling region 7, then for a viewer is the Light is visible in both area 8a and area 8b, creating an easily verifiable, stunning visual effect.
  • individual waveguides can be subsequently deactivated, for example by means of a laser, mechanically or chemically by local obstruction of the waveguide and the light can appear as a code in the form of images, symbols, characters, letters, lines, codes.
  • this coding can be carried out individually for each individual value document.
  • FIG. 12 Such an embodiment is shown in FIG. 12 using the example of a security element with three ridge waveguides (5a, 5b, 5c), which conduct the light coupled in in region 7 to the outcoupling areas 8a, 8b and 8c.
  • the ridge waveguide 5c was interrupted in FIG. 12 by irradiation with a laser beam, which melts the polymeric material and thus leads to a local interruption of the light pipe. If light is now coupled in region 7, the light becomes visible to a viewer only in regions 8a and 8b, but region 8c remains dark.
  • the security element according to the invention can have further functional layers.
  • the functional layers may have, for example, defined magnetic, chemical, physical and also optical or optically active properties.
  • paramagnetic, diamagnetic and also ferromagnetic substances such as iron, nickel and cobalt or their compounds or salts (for example oxides or sulfides) can be used.
  • Particularly suitable are agnet pigment pigments with pigments based on iron oxides, iron, nickel cobalt and their alloys, barium or cobalt ferrites, hard and soft magnetic iron and steel grades in aqueous or solvent-containing dispersions.
  • suitable solvents are i-propanol, ethyl acetate, methyl ethyl ketone, methoxypropanol and mixtures thereof.
  • the pigments are preferably incorporated in acrylate polymer dispersions having a molecular weight of from 150,000 to 300,000, in nitrocellulose, acrylate-urethane dispersions, acrylate-styrene or PVC-containing dispersions or in solvent-containing dispersions of this type.
  • the optical properties of the layer can be visualized by visible dyes or pigments, luminescent dyes or pigments which fluoresce or phosphoresce in the visible, in the UV region or in the IR region, effect pigments, such as liquid crystals, pearlescent, bronzes and / or multilayers - Color change pigments and heat-sensitive colors or pigments influence. These can be used in all possible combinations.
  • phosphorescent pigments can also be used alone or in combination with other dyes and / or pigments.
  • a brown magnetic ink can be adjusted to metallic, for example silvery, by adding metals in their color shade.
  • electrical properties such as conductivity, for example, graphite, carbon black, conductive organic or inorganic polymers.
  • Metal pigments for example copper, aluminum, silver, gold, Iron, chromium and the like
  • metal alloys such as copper-zinc or copper-aluminum or amorphous or crystalline ceramic pigments such as ITO and the like may be added.
  • doped or non-doped semiconductors such as, for example, silicon, germanium or ionic conductors, such as amorphous or crystalline metal oxides or metal sulfides, as an additive.
  • polar or partially polar compounds such as surfactants or nonpolar compounds such as silicone additives or hygroscopic or non-hygroscopic salts can be used or added to adjust the electrical properties of the layer.
  • the security element according to the invention can also have features with optically active properties, such as diffraction structures, diffraction gratings, holograms, surface reliefs and the like.
  • optically active properties such as diffraction structures, diffraction gratings, holograms, surface reliefs and the like.
  • This adhesive coating can be carried out either in the form of a heat-seal, cold-seal or self-adhesive coating.
  • the adhesive may also be pigmented, using as pigments all known pigments or dyes, for example TiO 2 , ZnS, kaolin, ATO, FTO, aluminum, chromium and silicon oxides or, for example, organic pigments such as pthalocyanine blue, i-indolide yellow, dioxazine violet and the like can.
  • organic pigments such as pthalocyanine blue, i-indolide yellow, dioxazine violet and the like can.
  • luminescent dyes or pigments which fluoresce or phosphoresce in the visible, in the UV range or in the IR range, effect pigments such as liquid crystals, pearlescent, bronzes and / or multilayer color change pigments and heat-sensitive inks or pigments can be added. These can be used in all possible combinations.
  • luminescent pigments can also be used alone or in combination with other dyes and / or pigments.
  • the adhesive layer may be applied over the whole area or partially, preferably the adhesive layer is recessed in the region of the input and output structures.
  • the security element can also be protected by a protective lacquer layer, which may be pigmented or unpigmented, and may be applied over the entire surface or partially and is also preferably omitted in the region of the input and output structures.
  • the security elements or the film material are therefore optionally suitable for assembly as security features in data carriers, in particular documents of value such as identity cards, cards, banknotes or labels, seals and the like, but also as packaging material, for example in the pharmaceutical, electronics and / or food industry, For example, as blister films, cartons, covers, film packaging and the like.
  • the substrates are preferably cut into strips, threads or patches, wherein the width of the strips or threads may preferably be 0.5-20 mm and the patches preferably have average widths or lengths of 1-50 mm.
  • the security element may be formed as a transfer element, wherein after the application to the object to be secured, the carrier substrate is withdrawn. If appropriate, the release capability can be adjusted by a known release layer applied to the carrier substrate.
  • Suitable release layers are known poorly adhering compositions, for example those based on cycloolefin copolymers, nitrocellulose, acrylates, polyvinyl chloride, ethylene acrylate copolymers or styrene acrylates in a suitable solvent.
  • chlorinated polyolefins are added.
  • even very thinly applied polyamide, polyethylene, fluoropolymer wax layers or silicone coatings can be used as a release layer.
  • FIG. 13 Such an embodiment is shown in FIG. 13, wherein the carrier substrate 1 is removed again after application of the security element to the value document 12 and the remaining layer structure with the cladding layers 2 and 4 and the waveguide layer 3 and the adhesive layer 21 remains on the value document 12.
  • the cladding layer 2 is produced in such a way that its adhesion to the carrier substrate 1 is sufficient for the processing of the security element, but a detachment upon application to the value document 12 without an additional release layer is possible if the adhesive force of the adhesive layer 21 on the security layer Value document 12 and the liabilities of the other layers are large enough with each other.
  • the layers are so thin that, in the case of a manipulation, the attempt to detach the layers from the value document again leads with high certainty to the destruction of the waveguide function.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Optical Integrated Circuits (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un élément de sécurité comprenant un substrat support (1), au moins une couche d'enveloppe (2) et une couche formant guide d'ondes (3). L'invention est caractérisée en ce que la couche formant guide d'ondes (3) comporte au moins une zone dans laquelle la lumière est guidée aussi bien latéralement que verticalement.
EP11721426.2A 2010-05-26 2011-04-28 Élément de sécurité à structures de guidage de lumière Withdrawn EP2576194A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0085910A AT509928A2 (de) 2010-05-26 2010-05-26 Sicherheitselement mit lichtleiterstrukturen
PCT/EP2011/002119 WO2011147520A1 (fr) 2010-05-26 2011-04-28 Élément de sécurité à structures de guidage de lumière

Publications (1)

Publication Number Publication Date
EP2576194A1 true EP2576194A1 (fr) 2013-04-10

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EP11721426.2A Withdrawn EP2576194A1 (fr) 2010-05-26 2011-04-28 Élément de sécurité à structures de guidage de lumière

Country Status (6)

Country Link
US (1) US20130056972A1 (fr)
EP (1) EP2576194A1 (fr)
AT (1) AT509928A2 (fr)
BR (1) BR112012030065A2 (fr)
CA (1) CA2797562A1 (fr)
WO (1) WO2011147520A1 (fr)

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US9410893B2 (en) * 2013-11-22 2016-08-09 Taiwan Semiconductor Manufacturing Company, Ltd. Bio-chip package with waveguide integrated spectrometer
JP6392876B2 (ja) * 2013-12-23 2018-09-19 セエスウエム サントル スイス デレクトロニクエ ドゥ ミクロテクニク ソシエテ アノニム−ルシェルシェ エ デブロップマン 導波モード共鳴デバイス
DE102015012616A1 (de) 2014-10-16 2016-04-21 Giesecke & Devrient Gmbh Kartenkörper für einen Datenträger und Inlay für einen Teil-Kartenkörper
JP6776585B2 (ja) * 2016-04-07 2020-10-28 大日本印刷株式会社 偽造防止用樹脂フィルム及び偽造防止物品
US10198890B2 (en) * 2016-04-19 2019-02-05 X-Celeprint Limited Hybrid banknote with electronic indicia using near-field-communications
EP3470896B1 (fr) 2016-06-13 2021-02-17 Dai Nippon Printing Co., Ltd. Film de guidage de lumière, structure de prévention de falsification et article de prévention de falsification
EP3531174A4 (fr) * 2016-10-21 2020-06-17 Dai Nippon Printing Co., Ltd. Stratifié et livret
JP7003931B2 (ja) * 2016-10-31 2022-01-21 大日本印刷株式会社 光学要素、積層体、冊子体
JP6977255B2 (ja) * 2016-12-09 2021-12-08 大日本印刷株式会社 導光フィルム、偽造防止用構造体および偽造防止物品
US11263856B2 (en) * 2017-03-01 2022-03-01 Spectra Systems Corporation Coded polymer substrates for banknote authentication
EP3590073B1 (fr) 2017-03-01 2024-10-16 Spectra Systems Corporation Substrats polymères codés destinés à une authentification de billets de banque
US20220009267A1 (en) * 2018-11-16 2022-01-13 Orell Füssli AG Waveguide-based anti-forgery security device
JP7587588B2 (ja) * 2020-01-27 2024-11-20 オレル フュースリ アクチェンゲゼルシャフト 光学式ライトガイドを有する身分証明ドキュメント
WO2021151459A1 (fr) * 2020-01-27 2021-08-05 Orell Füssli AG Document de sécurité avec guide de lumière présentant une structure de coupleur de sortie peu dense
EP4506182A1 (fr) * 2023-08-10 2025-02-12 Thales Dis France Sas Élément de sécurité doté d'un élément de diffusion de lumière
WO2025056167A1 (fr) * 2023-09-14 2025-03-20 Orell Füssli AG Élément optique de protection à base de guide de lumière pour documents de sécurité et document de sécurité

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Also Published As

Publication number Publication date
WO2011147520A1 (fr) 2011-12-01
CA2797562A1 (fr) 2011-12-01
US20130056972A1 (en) 2013-03-07
AT509928A2 (de) 2011-12-15
BR112012030065A2 (pt) 2016-08-09

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