EP2219168B1 - Elément de sécurité à transmission - Google Patents

Elément de sécurité à transmission Download PDF

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Publication number
EP2219168B1
EP2219168B1 EP10000465.4A EP10000465A EP2219168B1 EP 2219168 B1 EP2219168 B1 EP 2219168B1 EP 10000465 A EP10000465 A EP 10000465A EP 2219168 B1 EP2219168 B1 EP 2219168B1
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EP
European Patent Office
Prior art keywords
see
security element
layer
metal layer
color
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.)
Revoked
Application number
EP10000465.4A
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German (de)
English (en)
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EP2219168A3 (fr
EP2219168A2 (fr
Inventor
Annett Bähr
Hans Lochbihler
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP2219168A2 publication Critical patent/EP2219168A2/fr
Publication of EP2219168A3 publication Critical patent/EP2219168A3/fr
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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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D15/00—Printed matter of special format or style not otherwise provided for

Definitions

  • the invention relates to a see-through security element for security papers, documents of value and the like, a method for producing such a see-through security element and equipped with such a see-through security element data carriers.
  • 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 security elements may be in the form of, for example, a security thread embedded in a banknote, a tearing thread for product packaging, an applied security strip, a cover sheet for a banknote with a through opening or a self-supporting transfer element, such as a patch or label after its manufacture is applied to a document of value.
  • the publication WO 01/03945 A1 relates to a security article with a translucent substrate, on the outer first surface of an optical interference pattern is formed. On the opposite second surface is formed a color shifting optical coating which exhibits a visible color shift effect as the angle of incidence of the light or the viewing angle changes.
  • the publication WO / 095227 A1 relates to an optically variable element having a thin film for producing color shifts by means of interference and / or a reflective layer.
  • the optically variable element further has a transparent window and the thin film and / or the reflective layer is in each case formed as a partial element, namely as a partial thin-film element or as a partial reflective element, wherein the one or more partial elements enclose the area of the transparent window.
  • the publication EP 1 353 197 A2 refers to chromatic diffractive pigments that carry different diffractive structures.
  • the diffractive pigment flakes may have a symmetrically stacked coating structure on opposite sides of a reflective core layer, or may have an asymmetrically stacked coating structure on one side of a reflective layer, or may also be formed with one or more encapsulating coatings around the reflective core layer.
  • the object of the present invention is therefore to provide a generic see-through security element which combines an appealing visual appearance with high security against counterfeiting.
  • a see-through security element has the features mentioned in claim 1, and in particular contains exactly one metal layer and at least one dielectric layer, wherein the metal layer is formed semitransparent.
  • semitransparent is meant translucency, in particular a light transmission between 3% and 80%.
  • the see-through security element in reflected light on a metallic reflective and in transmitted light a colored visual impression.
  • the see-through security element appears metallically specular and color-neutral in reflected light and appears colored in the transmitted light.
  • the colored transmission is combined with a color shift effect, so that the see-through security element appears in transmitted light depending on the viewing angle with a different color and thus has a semi-transparent color shift effect.
  • the color of transmitted or reflected light can be quantified by specifying a color locus in a color system.
  • the see-through security element according to the invention preferably has a colouration F ⁇ 0.10, particularly preferably F ⁇ 0.05, when viewed perpendicularly.
  • the see-through security element then shows in reflected light only weak, almost completely desaturated colors, which hardly visually stand against the background of the metallic reflection of the semitransparent metal layer.
  • the color impression always remains weak when tilting the see-through security element
  • the see-through security element preferably always having a color F ⁇ 0.10 in reflected light in the angular range between 0 ° and 60 °.
  • the transmission of the see-through security element is colored, wherein the see-through security element in transmitted light when viewed perpendicularly preferably has a color F> 0.05, particularly preferably F> 0.10.
  • the strong color impression is retained for a wide range of the visible color in transmitted light or the visible in the transmitted light color shift effect.
  • the see-through security element in transmitted light in the angular range between 0 ° and 40 ° always a colouration F> 0.05, preferably F> 0.10.
  • the layer thickness of the semitransparent metal layer is preferably between 5 nm and 70 nm, wherein the thickness range between 15 nm and 50 nm for silver layers, the thickness range between 5 nm and 15 nm for aluminum layers and the thickness range between 30 nm and 70 nm is particularly preferred.
  • the semitransparent metal layer may in particular also be formed from chromium, nickel, copper, potassium, tungsten or an alloy of these metals. A particularly color-intensive transmission can be achieved with semitransparent metal layers of silver, aluminum, gold, potassium or copper.
  • the semitransparent metal layer in particular those metals are considered whose plasma frequency lies in the ultraviolet, visible or near-infrared spectral range.
  • the plasma frequency ⁇ p is the frequency of the longitudinal oscillations of the electron gas relative to the ion bodies.
  • the plasma frequency of silver corresponds to a wavelength of 311 nm (ultraviolet)
  • the plasma frequency of gold to a wavelength of 560 nm (visible)
  • the plasma frequency of aluminum to a wavelength of 830 nm (near infrared).
  • the semitransparent metal layer is homogeneous, ie in particular not formed in the form of metallic islands or clusters, and thus allows easy application, for example by vapor deposition in a vacuum coating process.
  • the semitransparent metal layer forms in particular a selectively absorbing optical element in the visible spectral range.
  • a semitransparent see-through security element can be provided whose transmission and reflection colors need not be complementary to one another.
  • the dielectric layers and the selective On the contrary, absorbing optical elements can advantageously be matched to one another in such a way that the see-through security element appears substantially neutral in color in reflection and produces a strong color impression in transmission.
  • the hue of the transmitted light is not sensitive to the layer thickness of the semitransparent metal layer, so that this parameter is not critical in the production.
  • the thin-film element of the see-through security element is a two-layered thin-film element which contains precisely one dielectric layer in addition to the semitransparent metal layer.
  • the thin-film element is a three-layered thin-film element which, in addition to the semitransparent metal layer, contains two dielectric layers arranged on opposite sides of the metal layer.
  • the two dielectric layers are advantageously high-refractive with a refractive index n ⁇ 1.8.
  • the thin-film element is a three-layered thin-film element which, in addition to the semitransparent metal layer, contains two dielectric layers arranged one above the other on the same side of the metal layer.
  • the first dielectric layer arranged directly on the semitransparent metal layer is low-refractive with a refractive index n ⁇ 1.8 and the second dielectric layer arranged on the first dielectric layer is high-refractive with a refractive index n ⁇ 1.8.
  • the layer thickness d and the refractive index n are preferably matched to one another such that the product d * n is between 300 nm and 800 nm.
  • the second dielectric layer arranged on the first dielectric layer advantageously has a layer thickness between 30 nm and 100 nm.
  • high-index dielectric layers are ZnS layers or TiO 2 layers
  • low-index dielectric layers can be formed, for example, from SiO 2 or MgF 2 .
  • the semitransparent metal layer may have recesses in the form of patterns, characters or codes, for example to represent additional information in the see-through security element.
  • the thin-film element may be combined with a diffractive diffraction structure, wherein the semitransparent metal layer forms the metallization layer of the diffraction structure.
  • the diffractive diffraction structure may in particular represent a hologram, a holographic grating image, a blazed diffraction structure, a computer-generated hologram (CGH) or another hologram-like diffraction structure.
  • the invention also includes a method for producing a see-through security element of the type described, in which a thin-film element with a color-shift effect is produced by exactly one semitransparent design Metal layer is combined with at least one dielectric layer.
  • the semitransparent metal layer and the at least one dielectric layer are expediently applied to a carrier, for example a film substrate, in particular vapor-deposited by a vacuum coating method.
  • the film substrate can be provided with a desired relief or embossed structure and coated, for example, with a primer / adhesion promoter. After transferring the see-through security element to a target substrate, the carrier can be detached from the security element.
  • the invention further includes a data carrier with a see-through security element of the type described above, wherein the see-through security element is arranged in particular in or over a transparent window area or a through opening of the data carrier.
  • 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, or an identity card, such as a credit card, bank card, cash card, authorization card, identity card or passport personalization page.
  • Fig. 1 shows a schematic representation of a banknote 10 with a through opening 14, which is covered with a see-through security element 12 in the form of a strip.
  • the Figures 2 and 3 show the bill 10 along the line II-II of Fig. 1 in cross section when viewed in reflected light ( Fig. 2 ) or transmitted light ( Fig. 3 ).
  • the see-through security element 12 shows when viewed a visually attractive reflected light / transmitted light effect, which visually enhances the security element compared to conventional metallized embossed holograms and also makes much more difficult to adjust. If the see-through security element 12 is viewed in incident light, for example in front of a dark background 20 (FIG. Fig. 2 ), the see-through security element 12 shows a specular, color-neutral metallic hologram 16 both in vertical viewing 22 and in oblique viewing 24. The semitransparency of the see-through security element 12 does not appear in the top view.
  • Such a reflected light / transmitted light effect is in contrast to the visual appearance of known optical interference coatings with a color shift effect, like the one in the publication WO 03/070482 A1 described semitransparent interference elements.
  • the interference elements of WO 03/070482 A1 always show a color shift effect both on the front and on the back.
  • the diffraction effects when viewed in incident light, so when the documents rests for example on a substrate, visually particularly stand out.
  • the diffraction effects occur significantly, but the color shift effect is pronounced in reflected light and in transmitted light.
  • the see-through security element according to the invention may, but does not necessarily have, to have a hologram. It is important in the context of the present invention, only that the see-through security element in the reflected light substantially neutral in color and without Farbkippable metallic reflective and appears in transmitted light with a semi-transparent color shift effect.
  • FIG. 4 shows the layer structure of a see-through security element 40 according to the invention in cross section.
  • the see-through security element 40 includes a thin-film element 42 with a color-shift effect, which contains exactly one metal layer 44 and exactly one dielectric layer 46.
  • the metal layer 44 is formed semitransparent with a light transmission between 3% and 70% and may be formed in particular from silver, aluminum, gold, chromium, nickel, copper, potassium, tungsten or an alloy of these metals.
  • the metal layer 44 is a 30 nm thick silver layer.
  • the dielectric layer 46 may be a low refractive index dielectric layer having a refractive index n ⁇ 1.8, such as SiO 2 or MgF 2 , or a high refractive index dielectric layer with a refractive index n ⁇ 1.8, such as TiO 2 or ZnS.
  • the dielectric layer 46 is a 525 nm-thick SiO 2 layer.
  • the see-through security element 40 of Fig. 4 viewed in incident light, so only the metallic reflective appearance of the metal layer 44, but no color shift effect can be seen.
  • the see-through security element When viewed in transmitted light, the see-through security element exhibits a semi-transparent color shift effect, for example from magenta to green.
  • the see-through security element 40 has, on the one hand, a simple structure with the two-layer thin-film element 42, and, on the other hand, shows a supervision / see-through effect which contrasts with conventional thin-film elements with a color-shift effect and increases the recognition value and the forgery-proof security of the see-through security element.
  • a film substrate 48 for example a PET film, is provided with a primer / adhesion promoter 45.
  • the semitransparent metal layer 44 is evaporated in the form of a generally 25 nm to 35 nm thick silver layer and then the dielectric layer 46 in the form of a generally 500 nm to 550 nm thick SiO 2 layer.
  • the order of the coating can also be reversed so that a 500 nm to 550 nm thick SiO 2 layer and then a 25 nm to 30 nm thick silver layer is vapor-deposited on the primer layer 45 first. The visual impression does not change due to the reversal of the layer order.
  • Fig. 5 shows an embodiment of the invention in which a two-layer thin-film element 52 next to a semi-transparent metal layer 54 includes a high-refractive dielectric layer 56.
  • the film substrate 58 of the see-through security element 50 in this exemplary embodiment contains an embossing lacquer layer 55 with a hologram embossing structure.
  • a primer layer After the application of a primer layer, first the dielectric layer 56 in the form of a 325 nm to 350 nm thick ZnS layer was vapor-deposited onto the film substrate, and then the semitransparent metal layer 54 was vapor-deposited in the form of a silver layer of about 30 nm thickness.
  • the see-through security element 50 When viewed in incident light, the see-through security element 50 shows an opaque metal hologram without color-shift effect. In transmitted light, a semi-transparent color shift effect is visible, which is visible only in the hologram embossing.
  • the see-through security element 50 thus combines a simple two-layer structure of the thin-film element 52 with a novel supervision / see-through effect.
  • the see-through security element 60 shown has a thin-film element 62 with a three-layer structure which generates a color-shift effect with very strong colors in transmitted light.
  • the see-through security element 60 comprises a film substrate 68 with or without embossed structure, a primer layer 65 and a thin-film element 62 having a three-layer structure with the layer sequence: semitransparent metal layer 74, low-refractive dielectric layer 76, high-index dielectric layer 78.
  • the semitransparent metal layer 74 was in the form of an approximately 30 nm thick layer of silver evaporated, the low-refractive dielectric layer 76 in the form of a 500 nm to 550 nm thick SiO 2 layer and the high-index dielectric layer 78 in the form of an approximately 50 nm thick ZnS layer.
  • the visual impression of the see-through security element 60 largely corresponds to that of the see-through security element 40 of FIG Fig. 4
  • the additionally provided high refractive dielectric layer 78 leads to a color shift effect with particularly strong colors.
  • the interface of the dielectric layers 76, 78 each reflects a portion of light back to the metal layer 74, thus causing multiple absorption within a light path.
  • a large refractive index difference such as for example between ZnS as a high-index dielectric layer and MgF 2 as a low-index dielectric layer, is advantageous.
  • Fig. 7 shows the use of a variant of the see-through security element of Fig. 6 to cover a continuous opening of a banknote 10.
  • the illustrated see-through security element 80 has a foil substrate 88 with an embossing lacquer layer 85 with a hologram embossing structure.
  • On the film substrate 88 is a thin film element 82 having a three-layer structure as in FIG Fig. 6 , ie with the layer sequence: semitransparent metal layer 94, low-refractive-index dielectric layer 96 and high-refractive-index dielectric layer 98.
  • the semitransparent metal layer 94 may be present only in regions.
  • the thin-film element 62 is further provided with a protective lacquer layer 84 and applied to the banknote 10 via an adhesive layer 86 in the region of the opening 14.
  • the see-through security element 80 When viewed in incident light, the see-through security element 80 shows an opaque metal hologram with no color shift effect, as in Fig. 2 described. In transmitted light, a semitransparent color shift effect with very strong colors, as always with Fig. 3 described.
  • the color transmission is as follows: Dielectric layers can block regions of the visible spectrum in the transmission, so that the reflection appears colored. Since no light is absorbed, the transmission includes the complementary color of the reflection. If a dielectric layer is combined with a selectively absorbing optical element which absorbs part of the visible spectral range, then the reflection no longer has to be color-complementary to the transmission. On the contrary, such a combination may appear colorless in reflection, but may have a color in transmission.
  • the selectively absorbing optical element is formed by a very thin metal layer having a thickness of less than 100 nm.
  • the selective optical absorption in the visible spectral range is based not on the interference of multiply reflected light beams but on an intrinsic property of metals, namely the fact that metals are for light with a higher frequency than the plasma frequency of the metal become transparent.
  • the influence on the transmission in the visible spectral range is greater, the closer the plasma frequency is to the visible range.
  • Light whose frequency corresponds to the plasma resonance is absorbed more intensely and increase the transmission for the same wavelength range.
  • the color effect of the metal layer alone is approximately independent of the angle of incidence of the light or of the viewing angle of the observer.
  • the transmitted color hardly changes when the layer thickness of the metal layer is changed. A change in the layer thickness has primarily only on the color intensity.
  • Table 1 metal colour color difference Tmax pabs Ag blue 0.11 330nm 240-280 nm al blue 0.07 950 nm 830 nm Au yellow 0.09 540-600 nm - Cr slightly blue 0.03 - 600 nm Ni slightly blue 0.04 370 nm - Cu reddish 0.05 590 nm 250 nm K blue 0:07 in the blue in the blue W reddish 0.01 red blue
  • the metals silver, gold, aluminum, potassium and copper are particularly color intensive (large color difference to the white point).
  • the emission spectrum of a D65 lamp was used, which roughly corresponds to the color spectrum of daylight.
  • FIGS. 8 (a) and (d) in each case the CIE xy color chart, in which the spectral color band 100, on which spectral colors lie, includes all color gradients perceptible to the human eye, given in each case by hue and saturation, for a specific brightness.
  • the colors red at 630 nm, yellow at 570 nm, green at 520 nm and blue at 480 nm are marked on the spectral color train 100 by specifying the wavelength.
  • the spectral color train 100 is closed by the purple line 102.
  • FIGS. 8 (b) and (e) show as a function of the layer thickness d of the silver layer, the proportion of the reflected light R and transmitted light T in percent.
  • the reflection or the transmission has already been weighted with the sensitivity of the human eye and therefore corresponds to the L value of the Lab color space.
  • Curves 104 and 106 show the proportion of the reflected light and the transmitted light, respectively.
  • the color location of the transmitted light is indicated by the curve 114 in FIG Fig. 8 (d) shown.
  • the color location of the transmission moves from the white point W into the blue, approximately in the direction of the 480 nm mark on the spectral color band 100, so that the transmitted light appears clearly blue at a layer thickness above 25 nm.
  • the effect of color generation through a very thin metal layer as a selectively absorbing optical element is inventively combined with dielectric layers, on the one hand to enhance the color and on the other hand additionally to realize a color shift effect.
  • Particularly strong effects are achieved when two different dielectric layers with a dielectric interface are provided, which redirects some of the light back to the metal layer as efficiently as possible to effect multiple absorption in a light path, such as those discussed above the FIGS. 6 and 7 described designs.
  • the simulation underlying structure largely corresponds to the see-through security element 60 of Fig. 6 , but with the reverse layer sequence of the thin-film element 62, so that the top view is made on the thin silver layer.
  • FIGS. 9 (a) to (f) represent the brightness and color of this layer sequence as a function of the light incidence direction, expressed by the Polar angle ⁇ for reflection in reflection (left half of the figure, Fig. 9 (a), (b), (c) ) or in transmission (right half of the figure, Fig. 9 (d), (e), (f) ).
  • FIGS. 9 (a) and (d) each color locus in the CIE xy color chart As in Fig. 8 showed the FIGS. 9 (a) and (d) each color locus in the CIE xy color chart, the FIGS. 9 (b) and (e) the proportion of the reflected light R and transmitted light T and the FIGS. 9 (c) and (f) the color F of the reflected or transmitted light, expressed by the distance of the respective color locus from the white point W in the CIE-xy color chart.
  • Curves 124 and 126 indicate the proportion of the reflected light and the transmitted light, respectively.
  • the fraction of the reflected light is always between 70% and 80% for angles of incidence between 0 ° (vertical incidence) and 60 ° (curve 124), the proportion of transmitted light is between 15% and slightly more than 25% (curve 126).
  • the color of the transmitted light and the color shift effect is from the FIGS. 9 (d) and (f) to recognize.
  • the color difference of the transmitted light from the white point W is always greater than 0.10 up to a tilt angle of about 45 °, in some areas even greater than 0.15.
  • the specified layer sequence therefore shows in transmission strong colors and a pronounced color shift effect.
  • the color and the color change of the reflected light are much lower, as in the FIGS. 9 (a) and (c) shown.
  • the in Fig. 9 (a) the color locus indicated by the curve 132 changes from a desaturated orange color locus in a perpendicular direction of incidence with an increasing tilt angle over weak green tones to a pale blue near the white point W in an oblique viewing direction.
  • the color difference of the reflected light from the white point W is always less than 0.08, for the most part even less than 0.05.
  • the specified layer sequence therefore shows in reflection only very weak, almost completely desaturated colors, which visually hardly stand out against the background of the metallic reflection. Due to the small deviation of the color locations from the white point, the color change of the desaturated colors during tilting practically does not occur.
  • Fig. 10 shows a polymer banknote 140 with a printing area 142 and a transparent area 144 in which a see-through security element 150 according to the invention with the incident light / transmitted-light effect described above is applied.
  • the see-through security element 150 has a releasable film substrate 158, which is provided with an embossing lacquer layer 155 with a hologram embossing structure and a thin-film element 152.
  • the thin-film element 152 has a three-layer structure with the layer sequence: semitransparent Metal layer 164, such as aluminum or silver, low refractive dielectric layer 166, such as MgF 2 or SiO 2 , and high refractive dielectric layer 168, such as ZnS.
  • the semitransparent metal layer 164 may also include recesses 162 in the form of patterns, characters, or a coding, such as those shown in FIG Fig. 10 shown letter sequence "PL", have.
  • the thin-film element 152 is provided with a protective lacquer layer 154 and applied to the polymer banknote 140 via an adhesive layer 156 in the transparent region 144. After the transfer, the film substrate 158 is peeled off, as indicated by the reference numeral 160.
  • FIGS. 12 and 13 show two variants in which inventive see-through security elements are combined with hybrid substrates, such as composite film banknotes.
  • Fig. 12 1 shows a composite film banknote 170 having a first PET film 172, a paper layer 174 and a second PET film 176.
  • a see-through security element 180 of the type described above is embedded in the paper layer 174 in a window region 178 of the film composite banknote 170.
  • the see-through security element 180 is applied in the region of the window 178 to the second PET film 176 of the film composite banknote 170.
  • the see-through security element 180 includes a releasable film substrate 182 which is peeled off after transfer, as indicated by reference numeral 184.
  • Transparent safety elements according to the invention can also be used with cards, provided that they are at least partially transparent.
  • Fig. 14 shows a card 190, in which a see-through security element 180 of described above in a transparent area on the surface of the card 190 is applied.
  • the releasable film substrate 182 of the see-through security element 180 is peeled off after the transfer (reference numeral 184).
  • a see-through security element 192 according to the invention may also be embedded in an inner layer 194 of the card 190, as in FIG Fig. 15 shown.
  • the see-through security element according to the invention has mostly been combined, for example, with a hologram structure.
  • this variant is illustrative only and that combinations with other diffractive microstructures, such as holographic grating images or hologram-like diffraction structures, may be used, or with micro-optic relief structures such as blazed grids, Fresnel structures, lens or micromirror structures ,
  • microstructures with smaller structural elements are also suitable for such a combination, such as sub-wavelength gratings or moth-eye structures, whose structural elements may also be smaller than 100 nm.

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Claims (24)

  1. Elément de sécurité à transmission (40) pour papiers de sécurité, documents de valeur et similaires, avec un élément à couches minces (42) avec un effet de changement de couleur, lequel comprend précisément une couche métallique (44) et au moins une couche diélectrique (46), dans lequel la couche métallique (44) est réalisée de manière semi-transparente, caractérisé en ce que la couche métallique semi-transparente (44) forme un élément optique absorbant sélectivement dans la plage du spectre visible et que l'élément de sécurité à transmission (40) apparaît de manière réfléchissante métalliquement à la lumière incidente et neutre de couleur, et de manière colorée à la lumière transmise.
  2. Elément de sécurité à transmission (40) selon la revendication 1, caractérisé en ce que l'élément de sécurité à transmission (40) apparaît de manière colorée à la lumière transmise avec un effet de changement de couleur semi-transparent.
  3. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 2, caractérisé en ce que l'élément de sécurité à transmission (40) présente, à la lumière incidente, en cas d'observation à la verticale, une coloration F < 0,10, de préférence F < 0,05, dans lequel la coloration F est donnée par l'écart entre les coordonnées de chromaticité x, y de la couleur et le point blanc dans le système de référence colorimétrique CIE.
  4. Elément de sécurité à transmission (40) selon la revendication 3, caractérisé en ce que l'élément de sécurité à transmission (40) présente toujours, à la lumière incidente, dans la plage angulaire entre 0° et 60°, une coloration F < 0,10.
  5. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 4, caractérisé en ce que l'élément de sécurité à transmission (40) présente, à la lumière transmise, en cas d'observation à la verticale, une coloration F > 0,05, de préférence F > 0,10, dans lequel la coloration F est donnée par l'écart entre les coordonnées de chromaticité x, y de la couleur et le point blanc dans le système de référence colorimétrique CIE.
  6. Elément de sécurité à transmission (40) selon la revendication 5, caractérisé en ce que l'élément de sécurité à transmission (40) présente toujours, à la lumière transmise, dans la plage angulaire entre 0° et 40°, une coloration F > 0,05, de préférence F > 0,10.
  7. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 6, caractérisé en ce que l'épaisseur de couche de la couche métallique semi-transparente (44) se situe entre 5 et 70 nm.
  8. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 7, caractérisé en ce que la couche métallique semi-transparente (44) est formée par un métal dont la fréquence plasma se situe dans la plage spectrale ultraviolette, visible, ou de l'infrarouge proche.
  9. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 8, caractérisé en ce que la couche métallique semi-transparente (44) est homogène.
  10. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 9, caractérisé en ce que la couche métallique semi-transparente (44) est formée par de l'argent, de l'aluminium, de l'or, du cuivre, du potassium ou un alliage de ces métaux.
  11. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 10, caractérisé en ce que l'élément à couches minces (42) est un élément à couches minces à deux couches qui comprend, mise à part la couche métallique, précisément une couche diélectrique.
  12. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 10, caractérisé en ce que l'élément à couches minces (42) est un élément à couches minces à trois couches qui comprend, mise à part la couche métallique, deux couches diélectriques disposées sur des côtés situés en vis-à-vis de la couche métallique.
  13. Elément de sécurité à transmission (40) selon la revendication 12, caractérisé en ce que les deux couches diélectriques disposées sur des côtés situés en vis-à-vis de la couche métallique sont fortement réfringentes et avec un indice de réfraction n ≥ 1,8.
  14. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 10, caractérisé en ce que l'élément à couches minces (42) est un élément à couches minces à trois couches qui comprend, mise à part la couche métallique, deux couches diélectriques disposées l'une au-dessus de l'autre sur le même côté de la couche métallique.
  15. Elément de sécurité à transmission (40) selon la revendication 14, caractérisé en ce que la première couche diélectrique disposée directement sur la couche métallique est faiblement réfringente avec un indice de réfraction n < 1,8 et la deuxième couche diélectrique disposée sur la première couche diélectrique est fortement réfringente avec un indice de réfraction n ≥ 1,8.
  16. Elément de sécurité à transmission (40) selon l'une au moins des revendications 11 à 15, caractérisé en ce que, pour la ou les couche (s) diélectrique (s) disposée(s) directement sur la couche métallique, l'épaisseur de couche d et l'indice de réfraction n sont harmonisés entre eux de manière à ce que le produit d*n se situe entre 300 nm et 800 nm.
  17. Elément de sécurité à transmission (40) selon la revendication 15 ou 16, caractérisé en ce que la deuxième couche diélectrique disposée sur la première couche diélectrique présente une épaisseur de couche entre 30 nm et 100 nm.
  18. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 17, caractérisé en ce que la couche métallique semi-transparente (44) présente des évidements sous la forme de motifs, symboles ou codages.
  19. Elément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 18, caractérisé en ce que l'élément à couches minces (42) est combiné avec une structure de relief micro-optique.
  20. Procédé pour la fabrication d'un élément de sécurité à transmission (40) selon l'une au moins des revendications 1 à 19, dans lequel un élément à couches minces (42) avec un effet de changement de couleur est produit en ce que précisément une couche métallique (44) réalisée de manière semi-transparente est combinée avec au moins une couche diélectrique (46), dans lequel la couche métallique semi-transparente (44) forme un élément optique absorbant sélectivement dans la plage du spectre visible et l'élément de sécurité à transmission (40) apparaît de manière réfléchissante métalliquement à la lumière incidente et neutre de couleur, et de manière colorée à la lumière incidente.
  21. Procédé selon la revendication 20, caractérisé en ce que la couche métallique semi-transparente (44) et l'au moins une couche diélectrique (46) sont métallisées sous vide sur un support.
  22. Support de données avec un élément de sécurité à transmission (40) selon l'une des revendications 1 à 19.
  23. Support de données selon la revendication 22, caractérisé en ce que l'élément de sécurité à transmission (40) est disposé dans ou par-dessus une zone de fenêtre transparente ou une ouverture traversante du support de données.
  24. Support de données selon la revendication 22 ou 23, caractérisé en ce que le support de données est un document de valeur tel un billet de banque, en particulier un billet de banque en papier, un billet de banque polymère, un billet de banque composite lamellaire ou une carte d'identité.
EP10000465.4A 2009-02-13 2010-01-19 Elément de sécurité à transmission Revoked EP2219168B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009008853A DE102009008853A1 (de) 2009-02-13 2009-02-13 Durchsichtssicherheitselement

Publications (3)

Publication Number Publication Date
EP2219168A2 EP2219168A2 (fr) 2010-08-18
EP2219168A3 EP2219168A3 (fr) 2015-09-23
EP2219168B1 true EP2219168B1 (fr) 2018-07-11

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EP10000465.4A Revoked EP2219168B1 (fr) 2009-02-13 2010-01-19 Elément de sécurité à transmission

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EP (1) EP2219168B1 (fr)
DE (1) DE102009008853A1 (fr)

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AT507647B1 (de) * 2008-12-11 2011-06-15 Hueck Folien Gmbh Transparentes sicherheitselement
WO2014141636A1 (fr) 2013-03-12 2014-09-18 凸版印刷株式会社 Corps d'écran
FR3004470B1 (fr) * 2013-04-11 2015-05-22 Arjowiggins Security Element de securite comportant un pigment interferentiel et une charge nanometrique.
FR3004471B1 (fr) 2013-04-11 2015-10-23 Arjowiggins Security Element de securite comportant une structure de masquage contenant un melange de charges nanometriques.
DE102014010751A1 (de) * 2014-07-21 2016-01-21 Giesecke & Devrient Gmbh Sicherheitselement mit Subwellenlängengitter
DE102015015731A1 (de) * 2015-12-01 2017-06-01 Giesecke & Devrient Gmbh Sicherheitselement und mit demselben ausgestatteter Datenträger
DE102017009226A1 (de) 2017-10-04 2019-04-04 Giesecke+Devrient Currency Technology Gmbh Optisch variables Durchsichtssicherheitselement und Datenträger
WO2021052630A1 (fr) * 2019-09-20 2021-03-25 Giesecke+Devrient Currency Technology Gmbh Procédé de fabrication d'un élément de sécurité et élément de sécurité
CN115230277A (zh) * 2021-04-25 2022-10-25 中钞特种防伪科技有限公司 薄膜元件、透明防伪元件、及数据载体

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WO2003095227A1 (fr) 2002-05-14 2003-11-20 Leonhard Kurz Gmbh & Co. Kg Element optiquement variable comportant un element partiel transparent
WO2003095228A1 (fr) 2002-05-14 2003-11-20 Leonhard Kurz Gmbh & Co. Kg Element optiquement variable comportant une serie de couches constituees d'un film mince
WO2006069663A2 (fr) 2004-12-23 2006-07-06 Eckart Gmbh & Co. Kg Pigment a effet multicouche a couche d'absorbeur centrale, son procede de production, son utilisation, agent de revetement et objet revetu

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WO2001003945A1 (fr) 1999-07-08 2001-01-18 Flex Products, Inc. Surfaces de diffraction avec arriere-plans a changement de couleur
WO2003095227A1 (fr) 2002-05-14 2003-11-20 Leonhard Kurz Gmbh & Co. Kg Element optiquement variable comportant un element partiel transparent
WO2003095228A1 (fr) 2002-05-14 2003-11-20 Leonhard Kurz Gmbh & Co. Kg Element optiquement variable comportant une serie de couches constituees d'un film mince
WO2006069663A2 (fr) 2004-12-23 2006-07-06 Eckart Gmbh & Co. Kg Pigment a effet multicouche a couche d'absorbeur centrale, son procede de production, son utilisation, agent de revetement et objet revetu

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DE102009008853A1 (de) 2010-08-19
EP2219168A3 (fr) 2015-09-23
EP2219168A2 (fr) 2010-08-18

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