EP3427967A1 - Élément de sécurité à structure d'estampage à 2 dimensions optiquement variable - Google Patents

Élément de sécurité à structure d'estampage à 2 dimensions optiquement variable Download PDF

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Publication number
EP3427967A1
EP3427967A1 EP18000582.9A EP18000582A EP3427967A1 EP 3427967 A1 EP3427967 A1 EP 3427967A1 EP 18000582 A EP18000582 A EP 18000582A EP 3427967 A1 EP3427967 A1 EP 3427967A1
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EP
European Patent Office
Prior art keywords
cells
security element
color
information
cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18000582.9A
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German (de)
English (en)
Other versions
EP3427967B1 (fr
Inventor
Martin Imhof
Astrid Heine
Peter Franz
Thanh-Hao Huynh
Karlheinz Mayer
Raphael DEHMEL
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
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of EP3427967A1 publication Critical patent/EP3427967A1/fr
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Publication of EP3427967B1 publication Critical patent/EP3427967B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs

Definitions

  • the invention relates to a security element, which is provided in particular for producing a security paper, value document or secured product, wherein the security element has an optically variable embossed structure having a plurality of cells, which are arranged in a 2D pattern, the cells one to surface having a non-parallel surface which is characterized by a surface height difference and a surface orientation direction, the embossing structure having at least two types of cells differing in the direction of surface orientation and / or surface height difference, the embossing structure having Color is provided.
  • security elements are known to protect against imitation to value documents, such as banknotes, securities, credit or identity cards, passports, certificates, etc. Labels, packaging, etc. protect against counterfeiting.
  • the protection against counterfeiting in the case of open security elements is based on the fact that there is a visually simple and clearly recognizable optical effect which would not or only insufficiently be reproduced with customary reproduction devices, such as color copiers.
  • the colored appearance of a security element is determined by a sub-wavelength structure, which optionally can additionally be coated with paint.
  • Reflective microcavities provided with a uniform, color-tilting coating generate DE 10 2010 052 665 A1 different colors depending on the design of the microcavities.
  • DE 10 2009 056 934 A1 discloses a method of arranging the facets of a reflective structure to give the viewer a sculptural impression.
  • a security element of the aforementioned type is known in which grid-like honeycomb-shaped cells are arranged, which have by embossing facets with differently inclined surfaces.
  • the facets are mirror-coated and the different surface slopes in the 2D pattern of the honeycomb structure are distributed so that two different images or motifs are recognizable, depending on the viewing angle, which of the two subjects or images you can see.
  • Each motif or image is assigned a separate viewing angle area. If you tilt the security element in the assigned viewing angle range, the visibility of the subject changes.
  • the reflective layer can be applied as an ink.
  • the WO 2016/020066 A2 proposes a security element that also has a plurality of cells arranged in a 2D pattern.
  • the cells are each hemispherical, so each cell acts as a vault mirror.
  • Arranged over this 2D pattern of arching mirrors are line-shaped pressure elements which extend over a large number of arching mirrors. The position of the lines on the dome mirrors varies along the 2D pattern, creating an overall image or motif that has a motion effect when the security element is tilted or rotated.
  • the invention has the object of developing a security element of the type mentioned so that the visual optical effect fails more succinctly and thus the protection against counterfeiting is further increased.
  • the security element displays information to the viewer, and for this purpose has cells whose surface inclination is designed to reflect illumination in a specific angular range in a specific manner. Each cell acts as a pixel that is light or dark at a particular viewing angle, depending on the surface tilt of the cell. This will display the information. In a certain viewing angle range, the information is recognizable, wherein it optionally changes with variation of the viewing angle within the specific viewing angle range, ie with a corresponding tilting of the security element. In preferred embodiments, the cells are designed so that the viewer sees the information plastically or creates a plastic impression.
  • the information may be a subject such as an image, a logo or a number, etc.
  • the security element provides at least two different pieces of information that are recognizable in different viewing angle ranges. For two pieces of information, a first piece of information in a first viewing angle range and a second piece of information in a second viewing angle range can be seen.
  • Each information is assigned to a cell type. This is understood to mean a group of cells which together form the pixels representing the respective information.
  • the cells of the cell type usually have the same value, for example the same, for one of several surface orientation parameters Direction of the fall line.
  • the cell types then differ in this parameter; the distinguishing parameter, in that the cell types differ (and in turn have a constant value) causes the separation of the viewing angle range for the two pieces of information.
  • the viewing angle ranges in the azimuth angle with which one looks at the security element.
  • a variation of another parameter causes the surface orientation, e.g. As an inclination angle, within a cell type the plastic impression of the information represented by this cell type.
  • the cells are individually and differently colored.
  • the individual coloring of the cells is achieved by providing individual colored areas on or below the cells.
  • the color areas are arranged in a two-dimensional pattern that corresponds to the centers of the 2D pattern in which the cells are arranged.
  • the 2D pattern of the embossed structure of the cells determines the arrangement of the individual color areas.
  • the color areas are smaller in particular than the cells.
  • Each cell has exactly one color area.
  • certain deviations are also possible that absorb register fluctuations. If the area of the color job is designed to be slightly smaller than the cell, an offset between the pattern in which the color areas are arranged and the 2D pattern of the cells is permitted, without a color area lying outside the cell assigned to it.
  • Each color area is preferably arranged on exactly one cell.
  • the color area corresponds to at least 40% of the cell area, preferably more than 50% of the cell area, particularly preferably more than 65% of the cell area. In particular, this surface filling degree is less than 100%, in particular less than 95%, ie for each of the abovementioned minimum values.
  • the color areas can be one with the 2D pattern of the cell identical outer contour (as honeycomb in honeycomb) or its own outer contour (such as circle, rectangle or triangle in honeycomb) have.
  • the paint is applied to or under the embossed structure, especially by printing.
  • the applied color is preferably semitransparent or opaque. Opaque colors are particularly suitable if the color surface is arranged below the reflective cell surface of the cell.
  • a plastic impression can be generated and / or the plastic impression can be strengthened.
  • the plastic effect arises in the viewing angle range not (only) by the different surface orientation of the individual cells, but (also) by the individual application of color to the cells.
  • At least two pieces of information can be represented in the security element by providing a corresponding number of cell types.
  • the cell types differ by a parameter of surface orientation, e.g. As inclination angle (local course or constant for the entire surface), surface height difference or direction of the fall line.
  • This one parameter is constant within each cell type (but unlike in the other cell types).
  • All cells of at least a first (and a second) cell type are identical in the direction of surface orientation and / or the surface height difference.
  • another parameter may be varied within each cell type to convey the plastic impression of the information. For example, it is possible to distinguish the types of cells by the direction of the fall line.
  • the viewing angle ranges then differ by the rotational position of the security element in a plane that is stretched by the security element.
  • the information can be seen at different azimuth angles.
  • each cell type can z.
  • the surface tilt may be varied so that as the elevation angle of the view changes, the corresponding information encoded by the cell type at the appropriate azimuth angle will change in the manner of a plastic impression.
  • the colored structure of the cells reinforces this. It is also possible to dispense with a plastic design by the surface geometry.
  • the plastic effect is particularly strong if the coloring of the cells is used to reinforce a plastic effect already generated by the surface structuring of the embossed structure, for example by setting highlights etc.
  • the cells of a cell type can be uniformly colored, so that the information of one cell type differs from the information of the other cell type by the color. However, it is equally possible to make the cells of a cell type differently colored by different colored are occupied. It also color mixtures are possible with a multi-color printing, the only a limited number of primary colors has to create a mixed color by not uniformly printing cells of one cell type with the same color, but with different primary colors. For example, half of the cells of one cell type can be colored red, the other half can be colored yellow, giving the color orange as the mixed color. As primary colors at least two, preferably three or four colors are chosen. The selected primary colors are not limited to primary primary colors, such as CYMK, but any other (secondary or tertiary) colors may be used.
  • the cells may have a semi-transparent or opaque reflective layer.
  • the reflective layer is preferably a metallic or high-index layer.
  • the reflective layer can be applied before or after the introduction of the embossed structure, in particular over its entire surface.
  • the reflective layer is created by printing a paint (or a paint) with metallic pigments.
  • the metallic pigments are nanoscale pigments or planar pigments, in particular with an average length in the range of 0.5 to 10 microns.
  • the planar pigments can be rigid or flexible enough to conform to the embossed structure. It would be less cost effective to evaporate the reflective layer (CVD, PVD).
  • the reflective layer is produced by means of printing processes (eg offset, screen printing), then printed in color and then embossed.
  • the reflective layer is first embossed and then printed in color.
  • the reflective layer is applied to the film as a film application (eg as a hot or cold transfer film) or as a laminated metallic layer. It is then printed in color using a printing process and (optional before or after printing).
  • the cells have a minimum size of more than 10 ⁇ m, preferably more than 30 ⁇ m, in particular more than 100 ⁇ m, but are at most 1 mm in size.
  • the minimum size for example a width, a diagonal, a diameter or an edge length of a cell, is measured laterally, ie in relation to the ground plane.
  • the embossing height is at most 300 ⁇ m, preferably at most 150 ⁇ m, more preferably at most 100 ⁇ m, and is in particular in the range from 10 to 120 ⁇ m, preferably 25 to 100 ⁇ m, particularly preferably 25 to 50 ⁇ m.
  • the aspect ratio (height to width) is preferably 1: 1.3.
  • the area of the cells is between 100 ⁇ m 2 and 1 mm 2 , preferably between 900 ⁇ m 2 and 250,000 ⁇ m 2 , in particular between 10,000 ⁇ m 2 and 250,000 ⁇ m 2 , more preferably between 90,000 ⁇ m 2 and 250,000 ⁇ m 2 .
  • the embossed structure with isotropically distributed cells of different surface orientations. Without further action you would achieve no information and no plastic impression. The information visible at different viewing angles is then obtained by the individual printing of the cells. This makes it possible to design different motifs with one and the same embossing tool, depending on the color applied individually to the cells.
  • the cells divide the two-dimensional ground plane of the security element according to a 2D pattern.
  • regular cells are particularly preferred, but this is not the only option.
  • honeycomb cells Equally possible are triangular or square cells. There is no restriction on point-symmetric cells.
  • Pentagonal cells or rectangular cells are also possible.
  • the cells are provided with color, whereby they are individually colored.
  • the simplest embodiment consists in a printing process, the the cells individually printed.
  • the 2D pattern is preferably a surface-filling (gap-free) pattern.
  • the cells to be slightly spaced apart. A distance is small if it is smaller than the lateral minimum dimensions of the cells. In spaced cells, short sections are arranged in the unembossed substrate between the cells.
  • the base area of a cell is understood to be the area which results when the plan view of the ground plane of the security element is perpendicular, for example the plane of a substrate into which the embossed structure is embossed.
  • Those surfaces which are essential for the reflection behavior of the embossed structure, represent facets. It is irrelevant for these facets, whether they are designed as raised structures or as recessed structures. In recessed structures, the cells do not protrude from the plane of the substrate surface, but form depressions in the substrate surface; the facets protrude into the substrate. Mixed forms are possible.
  • a cell type pattern preferably contains a regularly repeating array of cells of two, preferably three, more preferably four, different types of cell types.
  • the security element contains at least two types of cells that differ in their surface orientation.
  • the concept of surface orientation is related to the angle of inclination and also to the direction of the surface inclination in planar facets. It is not limited to a flat inclined surface, but also includes non-linear, ie curved surfaces.
  • the surface orientation is generally determined by the surface height difference, ie the height difference between Highest point and lowest point characterized, in addition, by the course or the position of the fall line. In the case of planar facets, this information can be expressed by the azimuth angle, ie the angle of the fall line, and the angle of inclination, ie the (possibly average) slope of the inclined surface.
  • the basic height, ie the distance to a reference plane is not relevant to the optical effect of the facet. So you can choose them largely freely depending on the tooling and embossing.
  • the coating of the cells with color requires a registration of embossing and color application, for example by printing.
  • a printing method for example, a dry offset, wet offset or inkjet method can be used.
  • the order is selectable depending on the embodiment, ie it can be first embossed and then printed, printed first and then embossed or coined and printed at the same time. If you want to emboss and then print first, it is preferable to emboss a pass mark, such as outside of a motif or symbol to be embossed. This embossed registration mark can then be used to control the subsequent printing to ensure the correct mapping of the pattern of color areas to the 2D pattern of the cells.
  • a similar procedure can also be used when first printing and then embossing.
  • the substrate is designed with a perforation for exact gripper guidance during printing, so that firstly sheet-by-sheet is printed with the same orientation and then embossed.
  • print and embossing can also be matched exactly to one another in other ways. Such agents are known in the art.
  • a value document - for example a banknote, an identity document, a check, an electronically readable card, a product or a product packaging is provided with a security element of the type mentioned.
  • the security element can be applied with its embossed structure on the corresponding object or with in the article itself, so in particular an embossed structure in the substrate of the article, are formed.
  • a product or a product packaging is equipped with the security element for product protection or as protection against product counterfeiting.
  • FIG. 1 shows a banknote B, which has a security element S.
  • the security element S can also be attached to other locations of the banknote.
  • FIG. 2 shows an embodiment of the security element S, in which a plurality of honeycomb-shaped cells 1, 2 are provided, which differ in the associated information.
  • the cells 1 are still increasing explanatory manner a first information I and the cells 2 is a second information II.
  • FIG. 2 shows only two of the cells provided for this purpose; in fact, the cells are arranged in a two-dimensional pattern, as will be explained later.
  • the height a of a honeycomb cell, the z. B. was embossed by intaglio printing in a paper substrate, is between 10 .mu.m and 2 mm, preferably between 30 .mu.m and 0.5 mm and more preferably between 50 .mu.m and 0.3 mm.
  • Each cell is provided with a facet inclined in a certain direction, which reflects light from one direction.
  • the surface of the cell is oriented in a different direction, so that the cells 1 present the information I from a first viewing direction and make the cells 2 the information II from another direction.
  • this approach is not limited to two pieces of information; three, four, five, etc. Information is possible.
  • Cells that are not assigned to any of the information are called background cells and have, for example, a non-faceted surface, so they are unembossed, or have a specific, uniform facet orientation.
  • FIG. 3a shows by way of example the orientation of the here exemplarily planar facets symbolized by arrows 3, 4.
  • the arrows 3, 4 indicate the direction of the fall line along which a facet is inclined.
  • FIG. 3b shows a section through the cell 1 along the arrow 3, Figure 3c through the cell 2 along the arrow 4.
  • the cell 1 that generates the information I has a facet 7 with an inclination angle of ⁇ 1 and a depth of t1.
  • the angle of inclination is related to the plane E of the substrate or an embossing plate surface, with which the embossing of the substrate takes place.
  • the cell 2 which generates the information II has a facet 9 with an inclination angle of ⁇ 2 and a depth of t2.
  • the depths t1, t2 indicate the surface height difference of the facet 7, 9.
  • depth t (and so that the surface elevation difference) and inclination angle ⁇ are linked together by the extent a.
  • the angle of inclination is decisive for the reflection properties.
  • the depth is one for the production of important parameters.
  • the depth can be set between 0 and 350 microns, preferably, an area 10 and 120 microns. Depending on the height a of the cell, this results in an inclination angle ⁇ between 0 and 80 °, preferably between 10 and 70 °. Since cells of uniform extension and with flat facets are subsequently considered, their surface orientation can be specified by the direction of the fall line and the angle of inclination.
  • the contrast of the coded information I or II depends inter alia on the steepness of the return edge 8, 10 from the facet 7, 9 to the surface level E. The steeper the return edge 8, 10 and the closer it is to an angle of 90 ° with respect to the plane E, the more contrast-rich, the information I or II are distinguished.
  • the cells 1, 2 fill a desired area.
  • the outline of this area can be chosen arbitrarily.
  • FIG. 4 shows an embodiment with a substantially rectangular area in which hexagonal cells of two different cell types are arranged.
  • the cells of the different cell types are arranged in a recurring cell-type pattern, here in columns.
  • cell-type patterns are conceivable, such as column A: 1,2,1,2; Column B: 2,1,2,1.
  • cell-type patterns with more than two types of cells are conceivable, such as column-by-column or column A: 1,2,3; Column B: 3, 1, 2; Column C: 2,3,1.
  • FIG. 5 shows an exemplary 2D pattern of the cells 1, 2 to represent the two information I and II.
  • the information I is the capital letter "A", whose area is occupied by cells 1.
  • the area assigned to Information II corresponds to the capital letter "B” and is occupied by cells 2.
  • the areas which do not belong to either of the two information I and II are filled with cells for a background H.
  • the cells 1, 2 and optionally also the cells of the background H are provided with color areas, each color area being arranged on exactly one cell.
  • the color areas on the cells 1 do not all have the same color, but are distributed in such a way that they enhance the plastic impression of the information I, for example setting highlights, etc. The same applies to the cells 2.
  • Unfilled areas within the sections that encode the information in I and II may be filled with cells 1 or 2, resulting in a further increase in the contrast of the information. They can also be filled with cells for the background H, resulting in a more uniform appearance. However, more than two pieces of information in the embossed structure can also be coded.
  • the areas for the information I and II are arranged side by side. This is optional. It is preferred in terms of a higher security against forgery that the areas overlap at least partially, ie the cells 1 and 2, as shown in FIG. 4 is shown nested inside each other. By this is meant that cells 1 and cells 2 multiple adjacent, so not only at a boundary between two areas, as in FIG. 5 the case is that cells surround 1 cells 2 and vice versa.
  • Such an embodiment has the advantage that on the same surface of the security element, the information I and II appear depending on the azimuth angle of consideration.
  • FIG. 5 is not only simplified in the aspect that the color assignment of the cells is not drawn, nor does it represent that optional cells 1 and 2 have a certain variation in the orientation of the facets 7, 9, which ensures that the coded information I or II to the viewer plastic, ie spatially appears. This property is in FIG. 6 shown.
  • FIG. 6 is indicated by the direction of the arrow, the direction of the fall line and by the angle of the inclination angle ⁇ 1.
  • cells for the information I They are in FIG. 6 denoted by the reference numerals 1a and 1b.
  • the addition of the lowercase letter designates the individual design of the cells 1 for the first information I.
  • Varying inclination angles for the cells 2 are in FIG. 6 Cells 2a and 2b shown.
  • the cells of the background H have a uniform fall line and a uniform tilt angle or are restructured.
  • the cells 1 in the exemplary embodiment also have a uniform fall line direction, but a varied angle of inclination ⁇ 1.
  • the information I can be seen in a certain viewing angle range and changes in the sense of a plastic appearance when the security element S is tilted in this viewing angle range.
  • the information II is distinguished from the information I by that the fall line has a different direction.
  • the information I and II are respectively recognizable if the security element is rotated around the surface normal, which lies perpendicular to the security element.
  • FIG. 7 shows by way of example the variation of the angle of inclination for the information I.
  • the embossed structure of the FIG. 7 contains no cells for the second information II. This is for the sake of simplicity of explanation only.
  • FIG. 8 shows the interleaved arrangement of cells 1a, 1b, 1c and 1d and 2a, 2b, 2c and 2d.
  • the cells 1 have a fall line direction, the arrow in FIG. 8 facing upward, the cells 2 a falling line direction which runs obliquely to the bottom left.
  • All cells 1, 2 are occupied by color patches 11, which differ in their color. This is in FIG. 8 indicated by the hatching and an index in the reference numeral.
  • the index .1 stands for a red color area (hatching diagonally left above), the index .2 for a green color area (hatching vertical) and the index .3 for a blue color area (horizontal hatch).
  • each color area 11 lies on exactly one cell 1 or 2.
  • the cells are thus individual.
  • the cells 1 and the cells 2 are provided with colors differently. In the embodiment of the FIG. 8 all cells in the section shown are covered with a red color area 11.1. The information I therefore appears red in this area.
  • the cells 2 are held in different colors.
  • the cells 2a, 2c and 2d are provided with green color areas 11.2, the cell 2b with a red color area 2b.
  • a color mixture which leads to a green-yellow hue.
  • a color mixture is also possible for the cells 1.
  • the color is designed so that they have the spatial effect caused by the variation of the angle of inclination within the cells 1 and the cells 2 is generated supported.
  • FIG. 8 further shows that the color areas are individually on the respective cells. They are rounded in the illustration, but may equally have a different geometric shape, for example square or in the same outline as the cells 1, 2. It is essential, however, that the color surfaces 11 are arranged in a two-dimensional pattern, the 2D pattern the cells 1, 2 corresponds. By this is meant that the centers of the color areas 11 and the centers of the cells 1, 2 have the same basic pattern. An offset of these patterns against each other is tolerable within the scope of register fluctuations as long as the color surface centers remain above the cells.
  • a preferred embodiment is the described embossing structure with cells in hexagonal lattice forms.
  • the cells associated with the information in a repeating order of a basic sequence of To provide cells 1, 2, etc. in the 2D pattern.
  • the information can be obtained by omitting or exchanging cells. For example, all cells that should not carry information can be replaced by background cells with no sloped surface. It is also possible in individual sections to replace cells of one cell type with cells of another cell type. For the presentation of multiple information, it may be advantageous if two or more adjacent cells of the same cell type are adjacent to each other, as in FIG. 7 the case is. In extreme cases, the information may even be present as a contiguous chain or area of cells of the same cell type.
  • the information to be displayed can generally be contained in the embossed structure and / or in the color print.
  • the cells arranged in the two-dimensional pattern are individually printed with a multicolor, uniform color pattern.
  • the color pattern is insofar free of the information to be displayed (or only optionally carries with its outer contour an independent further information).
  • the information lies only in the embossed structure (or in the embossing tool).
EP18000582.9A 2017-07-10 2018-07-06 Élément de sécurité à structure d'estampage à 2 dimensions optiquement variable Active EP3427967B1 (fr)

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Application Number Priority Date Filing Date Title
DE102017006513.6A DE102017006513A1 (de) 2017-07-10 2017-07-10 Sicherheitselement mit optisch variabler 2-dimensionaler Prägestruktur

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EP3427967A1 true EP3427967A1 (fr) 2019-01-16
EP3427967B1 EP3427967B1 (fr) 2020-09-16

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005011612A1 (de) * 2004-08-13 2006-02-23 Giesecke & Devrient Gmbh Datenträger mit einer optisch variablen Struktur
WO2013045054A1 (fr) * 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Élément de sécurité doté d'une structure optiquement variable constituée de micro-miroirs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056934A1 (de) * 2009-12-04 2011-06-09 Giesecke & Devrient Gmbh Sicherheitselement, Wertdokument mit einem solchen Sicherheitselement sowie Herstellungsverfahren eines Sicherheitselementes
DE102010052665A1 (de) * 2010-11-26 2012-05-31 Giesecke & Devrient Gmbh Reflektierendes Sicherheitselement für Sicherheitspapier, Wertdokumente oder dergleichen
DE102012110630A1 (de) * 2012-11-06 2014-05-08 Ovd Kinegram Ag Mehrschichtkörper sowie Verfahren zur Herstellung eines Sicherheitselements
DE102014018512A1 (de) 2014-12-12 2016-06-16 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005011612A1 (de) * 2004-08-13 2006-02-23 Giesecke & Devrient Gmbh Datenträger mit einer optisch variablen Struktur
WO2013045054A1 (fr) * 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Élément de sécurité doté d'une structure optiquement variable constituée de micro-miroirs

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EP3427967B1 (fr) 2020-09-16

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