EP2708371B1 - Elément de sécurité optique variable avec effet visuel supplémentaire de réflexion/transmission - Google Patents

Elément de sécurité optique variable avec effet visuel supplémentaire de réflexion/transmission Download PDF

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Publication number
EP2708371B1
EP2708371B1 EP13004502.4A EP13004502A EP2708371B1 EP 2708371 B1 EP2708371 B1 EP 2708371B1 EP 13004502 A EP13004502 A EP 13004502A EP 2708371 B1 EP2708371 B1 EP 2708371B1
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EP
European Patent Office
Prior art keywords
security element
variable security
optically variable
view
image elements
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
EP13004502.4A
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German (de)
English (en)
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EP2708371A1 (fr
Inventor
Stefan Bichlmeier
Christian Fuhse
Thomas Gerhardt
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 Currency Technology GmbH
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Publication of EP2708371A1 publication Critical patent/EP2708371A1/fr
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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
    • B42D25/20—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • 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

Definitions

  • the invention relates to an optically variable security element which has a combination of thin optically active layers, which has at least one first color impression in plan view and at least one second color impression in view, wherein the optically variable security element has an additional up / translucent effect.
  • the invention further relates to a method for producing such an optically variable security element.
  • color-shift and see-through effects are usually realized by means of optically variable security elements in which a combination of thin optically active layers with successive metal and dielectric layers is deposited on top of one another on a carrier film. These effects show a relatively unambiguous color change from a defined color to a further defined color when viewing the functional layer carrier provided with color effect, for example through a hole in the carrier substrate on which the functional layer carrier is applied.
  • Such optically variable security elements are, for example, thin-film elements which consist of a reflector layer, a dielectric and an absorber layer. If the security element is viewed from the absorber side, the viewer perceives a certain color, which changes as the viewing angle changes.
  • the cause of the color shift is an interference effect between the light rays reflected from the surface of the outer partially transmitting layer (absorber layer) and the light rays passing through the outer partially transmitting and the middle dielectric layer and be reflected back from the inner metal reflector layer to the partially transmissive layer.
  • the light beams are then either transmitted to the outside or reflected again at the partially transparent layer, so that in this case the light beams are repeatedly reflected back and forth between the reflection layer and the partially transparent layer.
  • the light rays that have passed through the thin film layer have traveled a longer distance than the light rays reflected on the surface of the thin film layer, so that they are out of phase with each other when interfering with them.
  • the path of the light beams traversed in the thin-film layer is of different lengths. This difference results from the path difference of the beams reflected multiple times within the thin film layer due to the angle of incidence. Therefore, the phase angle of the interfering light beams is different depending on the angle of incidence, so that depending on the angle of incidence different colors or hues of the resulting, perceived by the observer light beam result.
  • a security element of at least one thin-film element in the form of an interference-capable, multilayer structure is known.
  • the interference-capable, multilayer structure consists of at least one reflective layer, at least one partially transmissive layer and at least one dielectric layer arranged between these layers.
  • the security element has a plurality of recesses in the reflective layer in a first region and at least one recess or a plurality of recesses in the partially transparent layer in a second region.
  • the second region is arranged at least partially within the first region and the total area of the second area located at least partially within the first area is smaller than the total area of the first area.
  • the security element has a different appearance in plan view than in phantom.
  • a security element made of at least one light-transmissive substrate on which there is a substantially opaque, screened layer of raster elements.
  • at least one thin, continuous, substantially opaque line is arranged within the substantially opaque, screened layer of raster elements, which line has the shape of at least one alphanumeric character, a graphic or a pattern.
  • Such lines have line widths of at least 0.1 mm to 5 mm, preferably from 0.2 mm to 0.7 mm, more preferably about 0.5 mm.
  • This security element thus shows, viewed at least from the side of the substantially opaque, screened layer, a different appearance in supervision than in transparency.
  • WO 01/53113 A1 is an optically variable security element with a combination of thin optically variable layers known, for example US 5,278,590 are known, wherein the optically variable security element is combined with an optical interference pattern.
  • This optical interference pattern here consists of a diffractive structure or a microstructure.
  • a security element for protecting valuables in which a thin-film element with a color-shift effect and a relief structure present in an embossing lacquer layer are arranged one above the other.
  • the embossing lacquer layer with the relief structure is metallised in partial areas.
  • the relief structure of the partially metallized embossing lacquer layer is flattened with a transparent lacquer layer whose refractive index essentially corresponds to the refractive index of the embossing lacquer layer.
  • WO 97/47478 A1 discloses the preamble of claim 1.
  • the additional open / see-through effect is produced by at least one arrangement of picture elements which is applied to at least one side of the optically variable security element.
  • picture elements are particularly preferably designed as raster elements, wherein the individual raster element may be designed point or line-shaped or may take any other shape, such as square, rectangular, triangular or star-shaped.
  • the arrangement of raster elements preferably forms in its entirety at least one alphanumeric character, a graphic or a pattern.
  • a grid according to this invention is a uniform or non-uniform arrangement of grid elements, wherein the grid elements are spaced apart.
  • the picture elements are preferably designed as at least one continuous or interrupted area or line in the form of at least one alphanumeric character, a graphic or a pattern.
  • an area of substantially opaque and transparent image portions may be a paper-like representation of a person or the value of a banknote that is positive, i. dark against a light background, or negative, i. e. bright against a dark background, is shown. Shadow-like effects can also be displayed here, wherein, for example, the edge of a graphic on one side is made wider than the edge of the opposite side.
  • picture elements can also be designed from a mixture of raster elements and continuous or discontinuous surfaces, wherein a part of the alphanumeric character to be imaged, the graphic or pattern consists of raster elements and another part consists of one or more continuous or discontinuous areas.
  • the security element thus consists of functional layers appearing to appear in different colors in a plan view and transparency, in combination with fine demetallizations or colors or the like.
  • the invention in this case comprises both a substrate with a security element and a data carrier with a substrate with a security element.
  • the data carrier is in particular a value document, such as a banknote, a security, a credit or identity card, a passport, a document and the like, a label, a packaging or another element for product assurance.
  • a particular advantage of the invention is that in review not only a motif, but also a different color of the supervisory color is visible.
  • semitransparent layer systems are used with a structure absorber dielectric absorber.
  • an absorber layer can be replaced at least in regions by a reflector layer.
  • the grid elements consist of an ink or of a metallic or metal-like coating.
  • a raster print or a corresponding separate Rasterdemetallmaschine is thus generated, which is deposited the color / metal support.
  • the printing or vapor deposition material can be paint, or metal and dielectric.
  • Other embodiments may include fluorescent colors, colors of different transparency or within a spectral range more or less active colors or different metals. Combinations of versions are possible by substrate design with two windows within a banknote.
  • the grid is produced by means of a so-called washing process, in particular from the WO 99/13157 A1 is known.
  • a washing ink is applied to the at least one side of the optically variable security element, wherein the washing color forms a pattern which is inverted to the pattern.
  • a covering layer is applied to the washing paint and the covering layer is removed again by means of a washing process at the points below which the washing ink is located, so that the at least one arrangement of grid elements is produced.
  • the structuring can take place by means of a metal transfer process.
  • both the donor and the acceptor can be used (in very specific versions both).
  • a single metal layer eg opaque metallization
  • several layers can be transferred (eg absorber and dielectric).
  • metal transfer should not be understood in the literal sense as transfer only metallic layers, but also include an extension of the so-called method on layer systems with non-metallic layers (eg SiO 2 , MgF, TiO 2 ).
  • a particular advantage of the metal transfer method is that very high-resolution images are possible, for example, even high-resolution half-tone representations, such as portraits, or microtext with tiny font sizes.
  • a fine structuring or screening of a metal layer by means of the metal transfer process that very high-resolution grid with a line density of more than 150 lpi (lines per inch), preferably more than 200 lpi and more preferably more than 300 lpi and very fine line thicknesses with a line width of less than 100 microns for still visible text are possible.
  • So-called transparency / supervisory layers are characterized by the fact that a certain color impression is produced in the review. In the supervision, however, a different color impression, as can be achieved, for example, by overprinting with a more or less transparent lacquer / color layer, can be produced. For example, if you look at a film that is painted very thinly with transparent red paint, it will appear red, while when looking through this film, you may have a rather green color impression. The respective color complementary to the supervisory color is thus visible in the see-through (the spectrum of the transmitted light is the viewing-light spectrum minus the supervisory-light spectrum minus absorption). Something similar can also be produced by vapor deposition with a sequence of very thin alternating metallic and dielectric layers. It is also possible to create a defined supervisory / see-through effect with completely new color combinations, even a fluorescent or luminescent supervisory / see-through effect is possible.
  • a rasterization is advantageous because it allows the execution of fine motifs and at the same time a high area coverage.
  • the color impression which the raster elements have in plan view, corresponds to a color impression of the combination of thin optically active layers in a view and / or in plan view.
  • the thin-layer element in the form of an interference-capable, multilayer structure which consists for example of an aluminum, a silicon dioxide and an aluminum layer can also be replaced by other effect materials, such as a printing ink with iriodin or pearlescent pigments from BASF.
  • the halftone printing can also be performed with ultraviolet or infrared active colors that are visible only in the ultraviolet or infrared wavelength range of electromagnetic radiation.
  • the embodiments and embodiments mentioned above and below are primarily aimed at covering an opening or a window in a banknote made of cotton paper.
  • possible further embodiments are the design as transfer strips and the subsequent introduction within multi-layer substrates, such as, for example WO 2004/028825 A2 or off WO 2006/066431 A1 as well as the design as transfer strips and the application on polymer substrates with transparent window.
  • the substrate thus preferably comprises paper and / or a film, in particular a translucent film.
  • the substrate is completely made of either paper or plastic.
  • the substrate can also be made of different materials in some areas, and in particular in a range of paper and at the same time in another area made of plastic, preferably from a translucent film exist.
  • a substrate more than one opening or window of a banknote can also be covered by a foil, which contains the embodiments and exemplary embodiments mentioned above and below. As a result, combinations of different effects within a banknote are possible.
  • Supervision in the context of this invention is illumination of the security element from one side and viewing of the security element from the same side.
  • Supervision in supervision is thus present, for example, when the front of the security element is illuminated and also viewed.
  • a viewing in the sense of this invention is a lighting of a security element from one side and a view of the security element from another side, in particular the opposite side.
  • a viewing in review is thus, for example, when the back of the security element illuminated and the front of the security element is considered. The light thus shines through the security element.
  • Fig. 1 shows in Fig. 1a a carrier film 1, which is for example a PET film, on which an aluminum-colored grid of raster elements 2 is applied.
  • the aluminum-colored grid can in this case vapor-deposited over the entire surface of the carrier film 1 and then, for example, by a washing process, as for example WO 99/13157 A1 is known to be partly demetallized again, so that the raster elements 2 remain on the carrier film.
  • the raster elements 2 can also be printed directly onto the carrier foil 1 by means of conventional printing methods known from the prior art.
  • a thin-film element 3 is arranged in the form of an interference-capable, multi-layered structure.
  • the thin-film element 3 has a three-layer structure and consists of an aluminum layer, a silicon dioxide layer and an aluminum layer. This thin-film element 3 appears in a top view in a golden and in a blue shade.
  • the raster image appears aluminum-colored against the golden background of the thin-film element 3.
  • Fig. 1b shows a variant in which a grid of gold-colored raster elements 4 on one side of the carrier film 1 and the thin-film element 3 in the form of an interference-capable, multi-layered structure on the opposite side of the carrier film 1 is arranged.
  • the color of the raster elements 4 is in this case selected so that it corresponds to the color of the thin-film element 3 in plan view.
  • a shaping of the supervisory / transparent layer can take place, which can be integrated by design with the grid layer.
  • design elements of the image-forming screening and the transparent area gold / blue are arranged in register or offset.
  • logically complementary structures are possible, such as screened gold color printing outside the coating area, which continues under the coating. For example, an image that appears in a plan view with a golden, screened frame and a golden inner surface changes to a black-rastered frame and a blue-shaded interior motif.
  • the application of the grid can be done by laminating a separate film.
  • a generation of the screening by a metal transfer method for example, a first film (“donor") have the screening in the form of surveys (for example, embossed in an embossing lacquer). This donor sheet is then coated with a poorly adherent metallization (for example vapor deposition) and subsequently brought into contact with another sheet (“acceptor sheet”) which is provided with a sticky surface (for example by coating with a sticky lacquer). If you then separate the two films, the metal is transferred to the surveys of the embossing on the acceptor.
  • the metallizations on the acceptor and donor films have a positive or negative image of the same fine screening in principle both can provide a fine screening for the subject invention.
  • the achievable feature sizes can be far below those that can be achieved with conventional printing methods (printing a color or wash), and be, for example, only a few microns.
  • Fig. 2 shows in Fig. 2a a carrier film 1, on which a grid of raster elements 5 is printed with a blue translucent color and thereon the thin-film element 3 is arranged in the form of an interference-capable, multi-layered structure.
  • the color of the grid elements 4 is in this case selected so that it corresponds to the color of the thin-film element 3 in a transparent view.
  • Fig. 2b is arranged on a support film 1, the thin-film element 3 in the form of an interference-capable, multi-layered structure and thereon the grid of raster elements 5 in the blue translucent color of Fig. 2a printed.
  • a blue raster image in front of the gold-colored background of the thin-film element 3 and in plan view from below on the security element, the gold-colored surface of the thin-film element 3.
  • the raster image vanishes in a transparent manner and results a homogeneous blue area.
  • the thin-film element 3 is arranged in the form of an interference-capable, multi-layered structure and applied thereon a first grid of raster elements 5 in a blue translucent color.
  • a second grid of raster elements 5 is applied in a blue translucent color, which, however, represents a different pattern than the first grid.
  • a grid of opaque raster elements 7 is applied and on it the thin-layer element 3 is arranged in the form of an interference-capable, multi-layered structure.
  • a further thin-film element 3 is arranged in the form of an interference-capable, multilayer structure.
  • the grid can be printed in this case, for example in the form of a black color.
  • Fig. 4 shows a picture element as a broken surface in the form of a graphic representation of the head of a female person. This represents the area from essentially opaque and transparent image parts, the person is a silhouette.
  • Fig. 4a shows here a positive representation, ie dark parts of the picture in front of a bright background, and Fig. 4b a negative representation, ie bright parts of the picture against a dark background.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Claims (9)

  1. Elément de sécurité visuellement variable, qui présente une combinaison de minces couches optiquement actives (3), qui présente en réflexion au moins une première impression colorée et en transmission au moins une deuxième impression colorée, dans lequel l'élément de sécurité visuellement variable présente un effet supplémentaire de réflexion/transmission, dans lequel l'élément de sécurité visuellement variable comprend au moins un arrangement d'éléments d'image, dans lequel l'effet supplémentaire de réflexion/transmission est produit par ledit au moins un arrangement d'éléments d'image (2, 4, 5, 6), qui est appliqué sur au moins un côté de l'élément de sécurité visuellement variable, dans lequel les éléments d'image (2, 4, 5, 6) ne sont pas des microstructures de diffraction de la lumière ou de production d'interférences, dans lequel à partir d'un côté donné de l'élément de sécurité visuellement variable et sous un angle d'observation donné les éléments d'image (2, 4, 5, 6) ne sont pas visibles en réflexion mais sont visibles en transmission ou à partir du côté donné de l'élément de sécurité visuellement variable et sous l'angle d'observation donné la combinaison de minces couches optiquement actives (3) n'est pas visible en réflexion mais est visible en transmission, caractérisé en ce que la combinaison de minces couches optiquement actives (3) est un élément en couche mince sous la forme d'une structure multicouche interférentielle.
  2. Elément de sécurité visuellement variable selon la revendication 1, caractérisé en ce que les éléments d'image (2, 4, 5, 6) sont réalisés sous forme d'éléments de grille.
  3. Elément de sécurité visuellement variable selon la revendication 1 ou 2, caractérisé en ce que les éléments d'image (2, 4, 5, 6) sont réalisés sous forme d'au moins une surface ou une ligne continue ou interrompue sous la forme d'au moins un caractère alphanumérique, d'un graphique ou d'un motif.
  4. Elément de sécurité visuellement variable selon au moins une des revendications précédentes, caractérisé en ce que les éléments d'image (2, 4, 5, 6) se composent d'une encre d'impression.
  5. Elément de sécurité visuellement variable selon au moins une des revendications 1 à 3, caractérisé en ce que les éléments d'image (2, 4, 5, 6) se composent d'un revêtement métallique ou de type métallique.
  6. Elément de sécurité visuellement variable selon au moins une des revendications précédentes, caractérisé en ce que l'impression colorée, que les éléments d'image (2, 4, 5, 6) présentent en réflexion, correspond à une impression colorée de la combinaison de minces couches optiquement actives (3) en transmission.
  7. Elément de sécurité visuellement variable selon au moins une des revendications précédentes, caractérisé en ce que l'impression colorée, que les éléments d'image (2, 4, 5, 6) présentent en réflexion, correspond à une impression colorée de la combinaison de minces couches optiquement actives (3) en réflexion.
  8. Procédé de fabrication d'un élément de sécurité visuellement variable selon au moins une des revendications précédentes, caractérisé en ce que l'on imprime les éléments d'image (2, 4, 5, 6) sur ledit au moins un côté de l'élément de sécurité visuellement variable.
  9. Procédé de fabrication d'un élément de sécurité visuellement variable selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on dépose une encre lavable sur ledit au moins un côté de l'élément de sécurité visuellement variable, dans lequel l'encre lavable forme un motif, qui est l'inverse du motif de l'élément de sécurité, on dépose une couche de masquage sur l'encre lavable et on produit au moyen d'une opération de lavage ledit au moins un arrangement d'éléments d'image (2, 4, 5, 6).
EP13004502.4A 2012-09-18 2013-09-13 Elément de sécurité optique variable avec effet visuel supplémentaire de réflexion/transmission Revoked EP2708371B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012018434.4A DE102012018434A1 (de) 2012-09-18 2012-09-18 Optisch variables Sicherheitselement mit zusätzlichem Auf-/Durchsichtseffekt

Publications (2)

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EP2708371A1 EP2708371A1 (fr) 2014-03-19
EP2708371B1 true EP2708371B1 (fr) 2018-08-01

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EP (1) EP2708371B1 (fr)
CN (1) CN103660686B (fr)
DE (1) DE102012018434A1 (fr)

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DE102014011692A1 (de) 2014-08-07 2016-02-11 Giesecke & Devrient Gmbh Sicherheitselement mit photochromem Farbstoff
US10859851B2 (en) 2014-10-24 2020-12-08 Wavefront Technology, Inc. Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products
DE102015003665A1 (de) 2015-03-20 2016-09-22 Giesecke & Devrient Gmbh Sicherheitselement
DE102015005446A1 (de) * 2015-04-28 2016-11-03 Giesecke & Devrient Gmbh Sicherheitselement mit Mehrschichtstruktur
WO2017011476A1 (fr) 2015-07-13 2017-01-19 Wavefront Technology, Inc. Produits optiques, gabarits pour la fabrication de produits optiques, et procédés de fabrication de gabarits et de produits optiques
US11113919B2 (en) 2017-10-20 2021-09-07 Wavefront Technology, Inc. Optical switch devices
CA3015684A1 (fr) 2016-04-22 2017-10-26 Wavefront Technology, Inc. Dispositifs de commutation optique
DE102016013242A1 (de) * 2016-11-07 2018-05-09 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit optisch variablem Durchsichtselement
CN107364252B (zh) * 2017-08-26 2019-06-04 上海速元信息技术有限公司 一种金融防伪票据
CN107487104B (zh) * 2017-09-09 2020-11-06 泗县飞虹体育文化发展有限公司 金融防伪票据
AU2020257828A1 (en) 2019-04-19 2021-10-14 Wavefront Technology, Inc. Optical switch devices
DE102020007088A1 (de) * 2020-11-19 2022-05-19 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement eines Sicherheitsdokuments mit Motivelement auf Markierungsschicht und Verfahren zum Erzeugen eines Sicherheitselements

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DE102012018434A1 (de) 2014-03-20
CN103660686A (zh) 2014-03-26
EP2708371A1 (fr) 2014-03-19

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