EP3427967B1 - 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
EP3427967B1
EP3427967B1 EP18000582.9A EP18000582A EP3427967B1 EP 3427967 B1 EP3427967 B1 EP 3427967B1 EP 18000582 A EP18000582 A EP 18000582A EP 3427967 B1 EP3427967 B1 EP 3427967B1
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EP
European Patent Office
Prior art keywords
cells
security element
cell
colored
element according
Prior art date
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EP18000582.9A
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German (de)
English (en)
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EP3427967A1 (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
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Giesecke and Devrient Currency Technology GmbH
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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 the production of a security paper, document of value or a secured product, the security element having an optically variable embossed structure which has a plurality of cells which are arranged in a 2D pattern, the cells being one to a base plane of the security element have non-parallel aligned surface, which is characterized by a surface height difference and a direction of the surface alignment, wherein the embossed structure has at least two types of cells that differ with regard to the direction of the surface alignment and / or the surface height difference, the embossed structure with Color is provided.
  • security elements are known to protect against counterfeiting in order to protect documents of value, such as bank notes, securities, credit or identification cards, passports, certificates, etc., labels, packaging, etc., from forgery.
  • documents of value such as bank notes, securities, credit or identification cards, passports, certificates, etc., labels, packaging, etc.
  • counterfeit protection is based on the fact that there is a visually simple and clearly recognizable optical effect that would not be reproduced or only inadequately reproduced with conventional reproduction devices such as color copiers.
  • the colored appearance of a security element is determined by a sub-wavelength structure, which can optionally be coated with color.
  • the security element according to DE 10 2005 011 612 A1 which discloses a security element according to the preamble of claim 1, exploits the concealing effect of an embossed structure.
  • the flanks of a pyramid structure can be coated in different colors. Only at certain angles is only one of the four flanks visible with its color and the other flanks are hidden. All flanks or two flanks are visible at the same time when viewed from above or at other angles of rotation.
  • Reflective microcavities with a uniform, color-changing coating create in DE 10 2010 052 665 A1 different colors depending on the design of the microcavities.
  • DE 10 2009 056 934 A1 discloses a method for arranging the facets of a reflective structure so that a three-dimensional impression is created for the viewer.
  • honeycomb-shaped cells are arranged in a grid-like manner, which have facets with differently inclined surfaces due to embossing.
  • the facets have a reflective coating and the different surface inclinations in the 2D pattern of the honeycomb structure are distributed in such a way that two different images or motifs can be recognized, whereby it depends on the viewing angle which of the two motifs or images you see.
  • Each motif or image is assigned its own viewing angle area. If the security element is tilted in the assigned viewing angle area, the visibility of the motif changes.
  • the reflective layer can be applied as a printing ink.
  • the WO 2016/020066 A2 proposes a security element which also has a plurality of cells which are arranged in a 2D pattern.
  • the cells are each hemispherical, so that each cell acts as a curved mirror.
  • Line-shaped pressure elements are arranged over this 2D pattern of curved mirrors, which extend over a large number of curved mirrors. The position of the lines on the curved mirrors varies along the 2D pattern, so that overall an image or motif is generated that has a movement effect when the security element is tilted or rotated.
  • the invention is based on the object of developing a security element of the type mentioned at the beginning in such a way that the visual optical effect is more concise and thus the protection against forgery is further increased.
  • the security element shows the viewer information and for this purpose has cells whose surface inclination is designed so that lighting is reflected in a certain angular range in a certain way.
  • Each cell acts as a pixel that is light or dark depending on the surface slope of the cell from a certain viewing angle. This will display the information.
  • the information can be recognized in a specific viewing angle range, optionally changing when the viewing angle is varied within the specific viewing angle range, that is, when the security element is tilted accordingly.
  • the cells are designed in such a way that the viewer sees the information vividly or creates a vivid impression.
  • the information can be a motif, such as a picture, a logo or a number, etc.
  • the security element presents at least two different pieces of information that can be seen in different viewing angle ranges.
  • a first item of information can be seen in a first viewing angle range and a second item of information is to be seen in a second viewing angle range.
  • Each piece of information is assigned to a cell type. This is understood to be a group of cells that together form the pixels that represent the respective information.
  • the cells of the cell type usually have the same value for one of several parameters of the surface orientation, for example the same Direction of the fall line.
  • the cell types then differ in this parameter; the differentiating parameter, in which 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 of the surface orientation within a type of cell the three-dimensional impression of the information represented by this type of cell.
  • the cells are individual and differently colored.
  • the individual coloring of the cells is achieved in that individual colored areas are provided on or under the cells.
  • the colored areas are arranged in a flat pattern which 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 colored areas.
  • the colored areas are smaller than the cells.
  • Each cell has exactly one colored area.
  • certain deviations are possible, which compensate for register fluctuations.
  • each colored area is preferably arranged on exactly one cell.
  • the colored area corresponds to more than 50% of the cell area, particularly preferably more than 65% of the cell area. In particular, this area filling level is - that is, for each of the aforementioned minimum values - below 100%, in particular below 95%.
  • the colored areas can be one with have an outer contour identical to the 2D pattern of the cell (such as a honeycomb in a honeycomb) or their own outer contour (such as a circle, rectangle or triangle in a honeycomb).
  • the color is applied on or under the embossing structure, in particular by printing.
  • the color applied is preferably semitransparent or opaque. Opaque colors are particularly suitable if the colored area is arranged below the reflective cell area of the cell.
  • the color design can create a three-dimensional impression and / or strengthen the three-dimensional impression.
  • the three-dimensional effect is not (only) created by the different surface orientations of the individual cells, but (also) by the individual application of paint to the cells.
  • At least two items 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. B. 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 different from the other cell types).
  • All cells of at least a first (and a second) cell type are identical in terms of the direction of surface alignment and / or surface height difference.
  • another parameter can be varied within each cell type in order to convey the three-dimensional impression of the information. For example, it is possible to distinguish the cell types from one another by the direction of the fall line.
  • the viewing angle areas then differ by the rotational position of the security element in a plane that is spanned by the security element.
  • the information can be seen at different azimuth angles.
  • the surface inclination can be varied so that when changing the elevation angle of the observation, the corresponding information, which is coded by the cell type for the appropriate azimuth angle, changes in the manner of a plastic impression.
  • the colored arrangement of the cells reinforces this. It is also possible to dispense with a three-dimensional design due to the surface geometry.
  • the measures of the security element described here are not associated with a complete loss of the plastic impression, since the cell types are designed in color, so that a plastic effect can also be realized exclusively through the colored arrangement of the cells.
  • the plastic effect is particularly strong, of course, if the coloring of the cells is used to reinforce a plastic effect already created by the surface structuring of the embossed structure, for example by adding highlights, etc.
  • the cells of a cell type can have a uniform color background, so that the information of one cell type differs from the information of the other cell type in terms of color.
  • Mixtures of colors are also possible, with multi-color printing that only uses a limited number of basic colors create a mixed color by not printing cells of one type of cell with the same color, but with different basic colors.
  • half of the cells of a cell type can be colored red, the other half colored yellow, which results in the color orange as a mixed color.
  • At least two, preferably three or four colors are selected as the basic colors.
  • the selected basic colors are not restricted to primary basic colors, such as CYMK, but any other (secondary or tertiary) colors can also be used.
  • the cells have a semi-transparent or opaque, reflective layer.
  • the reflective layer is preferably a metallic or highly refractive layer.
  • the reflective layer can be applied before or after the introduction of the embossed structure, in particular over the entire area.
  • the reflective layer is preferably created by printing a color (or a varnish) with metallic pigments.
  • the metallic pigments are nanoscale pigments or flat pigments, in particular with an average length in the range from 0.5 to 10 ⁇ m.
  • the flat pigments can be rigid or flexible enough to adapt to the embossed structure. It would be less cost-effective to vapor-deposit the reflective layer (CVD, PVD).
  • the reflective layer is particularly preferably created by means of printing processes (for example 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 (for example as a hot or cold transfer film) or as a laminated metallic layer. It is then printed in color using a printing process and embossed (before or after printing - optional).
  • 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, that is, in relation to the base plane.
  • the embossing height is a maximum of 300 ⁇ m, preferably a maximum of 150 ⁇ m, particularly preferably a maximum of 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 measures one would not get any information and no three-dimensional impression. The information, which is visible from different viewing angles, is then achieved through the individual printing of the cells. This makes it possible to design different motifs with one and the same embossing tool, depending on the application of paint that is applied individually to the cells.
  • the cells divide the two-dimensional basic plane of the security element according to a 2D pattern. Regular cells are of course particularly preferred, but this is not the only possibility. Honeycomb cells are known (bees). Triangular or square cells are equally possible. There is no restriction to point-symmetric cells. Pentagonal cells or rectangular cells are also possible.
  • the cells are provided with color, whereby they are individually covered with color. The simplest embodiment consists of a printing process, the the cells are individually printed.
  • the 2D pattern is preferably an area-filling (gap-free) pattern. It is equally possible for the cells to be slightly spaced from one another. A distance is slight if it is smaller than the minimum lateral dimensions of the cells. With spaced apart cells, short sections are arranged in the unembossed substrate between the cells.
  • the base area of a cell is understood to be the area that results from a vertical plan view of the base plane of the security element, 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 the case of deepened structures, the cells do not protrude from the plane of the substrate surface, but form depressions in the substrate surface; the facets thus protrude into the substrate. Mixed forms are possible.
  • Different ones of the at least two cell types can be arranged recurring in the 2D pattern - in a cell type pattern.
  • a cell type pattern preferably contains a regularly repeating arrangement of cells of two, preferably three, more preferably four, different cell type types.
  • the security element contains at least two types of cells which differ in terms of their surface orientation.
  • the term surface alignment is related to the angle of inclination and also to the direction of the surface inclination.
  • the surface orientation is generally determined by the surface height difference, i.e. the height difference between the highest point and lowest point, and also by the course or position of the fall line.
  • this information can be expressed by the azimuth angle, ie the angle information for the fall line, and the angle of inclination, ie the (possibly mean) slope of the inclined surface.
  • the basic height, ie the distance to a reference plane is not relevant for the optical effect of the facet. You can choose them largely freely depending on the tool manufacture and the embossing process.
  • Covering the cells with color requires registration of the embossing and application of color, for example by printing.
  • a dry offset, wet offset or inkjet process for example, can be used as the printing process.
  • the sequence can be selected depending on the embodiment, ie it can be embossed first and then printed, first printed and then embossed or simultaneously embossed and printed. If you want to emboss first and then print, it is preferable to emboss a registration mark, for example outside of a motif or symbol that is to be designed with the embossing. This embossed registration mark can then be used to control the subsequent printing in order to ensure the correct assignment of the pattern of the colored areas to the 2D pattern of the cells.
  • a similar procedure can also be used if you want to print first and then emboss. Then a printed registration mark is used.
  • the substrate is designed with a perforation for exact gripper guidance during printing, so that it is first printed in sheets with the same orientation and then embossed.
  • printing and embossing can also be precisely coordinated with one another in other ways. Such agents are known to the person skilled in the art.
  • a value document - for example a bank note, an identity document, a check, an electronically readable card, a product or product packaging - is provided with a security element of the type mentioned.
  • the security element can be applied with its embossed structure to the corresponding object or can be formed in the object itself, that is to say in particular an embossed structure in the substrate of the object.
  • a product or product packaging is equipped with the security element for product protection or as a safeguard against product counterfeiting.
  • Figure 1 shows a bank note B which has a security element S.
  • the security element S can also be attached at other points on the bank note.
  • Figure 2 shows an exemplary embodiment for the security element S, in which a plurality of honeycomb cells 1, 2 are provided, which differ with regard to the assigned information.
  • the cells 1 are still closed
  • first information I and cells 2 represent second information II.
  • Figure 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 which z. B. was embossed into a substrate made of paper by intaglio printing, is between 10 ⁇ m and 2 mm, preferably between 30 ⁇ m and 0.5 mm and particularly preferably between 50 ⁇ 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 it visible, the cells 2 the information II from a different 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 referred to as background cells and have, for example, a surface that is not designed as a facet, that is, they are not embossed or have a specific, uniform facet orientation.
  • Figure 3a shows an example of the orientation of the flat facets here, symbolized by arrows 3, 4.
  • the arrows 3, 4 denote the direction of the fall line along which a facet is inclined.
  • Figure 3b shows a section through cell 1 along arrow 3,
  • Figure 3c through cell 2 along arrow 4.
  • Cell 1 which generates information I, has a facet 7 with an angle of inclination 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 difference in surface height of the facet 7, 9.
  • depth t and thus the surface height difference
  • the angle of inclination is decisive for the reflection properties.
  • the depth is an important parameter for the production. With intaglio printing, the depth can be set between 0 and 350 ⁇ m; a range of 10 and 120 ⁇ m is preferred. Depending on the height a of the cell, this results in an angle of inclination ⁇ between 0 and 80 °, preferably between 10 and 70 °. Since cells of uniform size and with flat facets are considered below, their surface orientation can be specified by the direction of the line of fall and the angle of inclination.
  • the contrast of the coded information I or II depends, among other things, on the steepness of the return flank 8, 10 from the facet 7, 9 to the surface level E. The steeper the return flank 8, 10 and the closer it comes to an angle of 90 ° with respect to the plane E, the more contrasting the information I and II emerge.
  • Cells 1, 2 fill a desired area.
  • the outline of this area can be chosen as desired.
  • Figure 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 cell types are also conceivable, such as column-wise uniform or column A: 1,2,3; Column B: 3.1.2; Column C: 2,3,1.
  • Figure 5 shows an exemplary 2D pattern of cells 1, 2 for displaying the two items of information I and II.
  • Information I is the capital letter "A", the area of which 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 that do not belong to either of the two items of information I and II are filled with cells for a background H.
  • cells 1, 2 corresponding to Figure 3 executed, the information I or II appears depending on the azimuth angle of the observation.
  • cells 1, 2 and optionally also the cells of the background H are provided with colored areas, each colored area being arranged on exactly one cell.
  • the colored areas on cells 1 in the example do not all have the same color, but are distributed in such a way that they enhance the three-dimensional impression of the information I, for example set highlights, etc. The same applies to cells 2.
  • Areas not filled with cells within the sections which encode the information in I and II can be filled with cells 1 or 2, so that there is a further increase in the contrast for the information. They can also be filled with cells for the background H for a more even appearance. However, more than two pieces of information can be encoded in the embossed structure.
  • the areas for information I and II are arranged side by side. This is optional. In the sense of greater security against forgery, it is preferred that the areas at least partially overlap, cells 1 and 2, as shown in FIG Figure 4 shown are nested within one another. This means that cells 1 and cells 2 adjoin each other several times, i.e. not just on a border between two areas, as shown in Figure 5 is the case, but that cells 1 surround cells 2 and vice versa.
  • Such a configuration has the advantage that the information I and II appear on the same surface of the security element depending on the azimuth angle of the observation.
  • Figure 5 is not only simplified under the aspect that the color assignment of the cells is not shown, it also does not show that optionally cells 1 and 2 have a certain variation with regard to the alignment of facets 7, 9, which ensures that the Coded information I or II appears three-dimensional to the viewer. This property is in Figure 6 shown.
  • the direction of the fall line is indicated by the direction of the arrow and the angle of inclination ⁇ 1 by the angle specification.
  • Different cells are thus provided for the information I; They are in Figure 6 denoted by the reference numerals 1a and 1b.
  • the addition of the lower case letter denotes the individual configuration of cells 1 for the first item of information I.
  • Varying angles of inclination for the cells 2 are in Figure 6 Cells 2a and 2b shown.
  • the cells of the background H have a uniform fall line and a uniform angle of inclination or are restructured.
  • the cells 1 likewise have a uniform fall line direction, but a varied angle of inclination ⁇ 1. It fluctuates between -60 ° and + 60 ° degrees.
  • the information I can be recognized in a certain viewing angle range and changes in the sense of a three-dimensional appearance when the security element S is tilted in this viewing angle range.
  • Information II is distinguished from information I in that that the line of fall has a different direction. The information I and II can each be recognized if the security element is rotated appropriately around the surface normal which is perpendicular to the security element.
  • Figure 7 shows an example of the variation in the angle of inclination for information I.
  • the embossed structure of Figure 7 does not contain any cells for the second information item II. This is only used for the simplified explanation.
  • Figure 8 shows the nested arrangement of cells 1a, 1b, 1c and 1d as well as 2a, 2b, 2c and 2d.
  • the cells 1 have a fall line direction, the arrow in Figure 8 pointing upwards, the cells 2 have a fall line direction which runs obliquely downwards to the left.
  • All cells 1, 2 are covered with color fields 11, which differ in their color.
  • This is in Figure 8 illustrated by the hatching and an index in the reference number.
  • the index .1 stands for a red colored area (hatching obliquely to the top left), the index .2 for a green colored area (hatching vertical) and the index .3 for a blue colored area (hatching horizontal).
  • each colored area 11 lies on exactly one cell 1 or 2.
  • the cells are thus individual. Furthermore, cells 1 and cells 2 are provided with different colors. In the embodiment of Figure 8 all cells in the section shown are covered with a red colored area 11.1. The information I therefore appears red in this area. The cells 2 are kept different colors. The cells 2a, 2c and 2d are provided with green colored areas 11.2, the cell 2b with a red colored area 2b. In this way, for the motif generated by the cells 2 according to the information II in the affected section, a color mixture is established which leads to a green-yellow hue. Of course, color mixing is also possible for cells 1. In particular, the colors are designed in such a way that they create the spatial effect created by the variation of the angle of inclination within the cells 1 or the cells 2 is generated.
  • Figure 8 further shows that the colored areas lie individually on the respective cells. They are round in the representation, but can equally have a different geometric shape, for example square or with the same outline as cells 1, 2. However, it is essential that the colored areas 11 are arranged two-dimensionally in a pattern that corresponds to the 2D pattern which corresponds to cells 1, 2. This means that the centers of the colored areas 11 and the centers of the cells 1, 2 have the same basic pattern. An offset of these patterns from one another can be tolerated within the framework of register fluctuations as long as the color area centers remain above the cells.
  • a preferred embodiment is the described embossed structure with cells in hexagonal lattice shapes.
  • the cells assigned to the information in a repeated arrangement of a basic sequence of Cells 1, 2 etc. to be provided in the 2D pattern.
  • the information can be obtained by omitting or exchanging cells. For example, you can replace all cells that should not carry any information with background cells without a sloping surface. It is also possible to replace cells of one cell type with cells of another cell type in individual sections. For the display of several items of information, it can be advantageous if two or more neighboring cells of the same cell type are next to one another, as shown in FIG Figure 7 the case is. In extreme cases, the information can 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 colored print.
  • the cells arranged in the two-dimensional pattern are individually printed with a multicolored, uniform color pattern.
  • the color sample is free of the information to be displayed (or only optionally carries additional information of its own with its outer contour).
  • the information is only in the embossing structure (or in the embossing tool). It is also possible in embodiments to form the embossed structure with a purely repetitive arrangement of cells 1 and cells 2 (with two pieces of information) or additional cells (with more than two pieces of information), with cells 1, 2 (and possibly further cells) the direction of the fall line and the angle of inclination are constant.

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Claims (15)

  1. Élément de sécurité, cependant que l'élément de sécurité (S) comporte une structure gaufrée optiquement variable ayant une pluralité de cellules (1, 2) agencées en un motif 2D,
    cependant que les cellules (1, 2) comprennent une facette (7, 9), orientée de manière non parallèle à un plan de base (E) de l'élément de sécurité, en tant que surface caractérisée par une différence de hauteur de surface (t) et par une direction (3, 4) de l'orientation de la surface, et un flanc de retrait (8, 10) avec lequel la cellule passe en retrait d'une différence de hauteur de surface (t),
    cependant que les cellules (1, 2) comportent une couche réfléchissante semi-transparente ou opaque,
    cependant que l'élément de sécurité présente à un observateur une information, ce qui a lieu en ce que chaque cellule a l'effet d'un pixel qui, en fonction de l'orientation de la surface de la cellule, est clair ou foncé sous un certain angle d'observation,
    cependant que la structure gaufrée comporte au moins deux types de cellules (1, 2) qui se différencient quant à la direction (3, 4) de l'orientation de la surface et/ou quant à la différence de hauteur de surface (t),
    la structure gaufrée est pourvue de couleur, cependant que les cellules (1, 2) sont configurées individuellement et en une coloration différente (11.1-11.3),
    caractérisé en ce que
    les cellules (1, 2) sont pourvues respectivement d'une surface de couleur (11) qui est plus petite que la surface de la cellule mais qui correspond néanmoins à plus de 50 % de la surface de la cellule.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que le flanc de retrait (8, 10) a un angle de près de 90° relativement au plan de base (E) de l'élément de sécurité.
  3. Élément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les cellules (1, 2) comportent des surfaces de couleur (11) dont la couleur est issue d'une de plusieurs couleurs de base, cependant que des cellules (2) d'un des types de cellules sont, pour la configuration d'une couleur de mélange, pourvues de surfaces de couleur (11.2, 11.3) en différentes couleurs de base.
  4. Élément de sécurité selon une des revendications de 1 à 3, caractérisé en ce que, pour au moins un des types de cellules, toutes les cellules (2) sont configurées uniformément avec la même couleur.
  5. Élément de sécurité selon une des revendications de 1 à 4, cependant que chaque type de cellules code une information (I, II), et que la configuration de couleur est réalisée de telle façon qu'une impression plastique de l'information (I, II) est engendrée ou renforcée.
  6. Élément de sécurité selon une des revendications de 1 à 5, caractérisé en ce que les au moins deux types de cellules (1, 2) sont orientés de telle façon que les informations (I, II) leur étant affectées sont reconnaissables depuis différentes zones d'angles de vue distinctes les unes des autres.
  7. Élément de sécurité selon une des revendications de 1 à 6, caractérisé en ce que, à l'intérieur d'au moins un type de cellules, la direction (3, 4) de l'orientation de la surface et la différence de hauteur de surface est constante, et que de préférence une impression plastique de l'information (I, II) correspondante est obtenue par la configuration de couleur.
  8. Élément de sécurité selon une des revendications de 1 à 7, caractérisé en ce que, à l'intérieur d'au moins un type de cellules, la direction (3, 4) de l'orientation de la surface est constante et la différence de hauteur de surface est différente, et que de préférence une impression plastique de l'information (I, II) correspondante est obtenue par la configuration de couleur et par la différence de hauteur de surface.
  9. Élément de sécurité selon une des revendications de 1 à 8, caractérisé en ce que, pour au moins un autre type de cellules, toutes les cellules (2) sont configurées sans couleur.
  10. Élément de sécurité selon une des revendications de 1 à 9, caractérisé en ce que la couche réfléchissante est une couche métallique ou à indice de réfraction élevé.
  11. Élément de sécurité selon une des revendications de 1 à 10, caractérisé en ce que les cellules (2) d'un type de cellules sont réalisées de façon différemment colorée, ce qui a lieu en ce qu'elles sont différemment pourvues de coloration.
  12. Élément de sécurité selon une des revendications de 1 à 11, caractérisé en ce que de la couleur appliquée sur les cellules (1, 2) est semi-transparente, ou que des surfaces de couleur opaques sont agencées en-dessous de la surface réfléchissante des cellules.
  13. Objet tel que document de valeur, produit ou emballage de produit, doté d'un élément de sécurité selon une des revendications de 1 à 12, caractérisé en ce que l'objet comprend un substrat et que la structure gaufrée est constituée dans la surface du substrat, ou que la structure gaufrée est constituée dans l'élément de sécurité qui est appliqué sur le substrat.
  14. Procédé de fabrication d'un élément de sécurité (S), cependant que, dans un substrat, une structure gaufrée optiquement variable est gaufrée, laquelle a une pluralité de cellules (1, 2) agencées en un motif 2D, cependant que les cellules (1, 2) comprennent une facette (7, 9), orientée de manière non parallèle à un plan de base (E) de l'élément de sécurité, en tant que surface caractérisée par une différence de hauteur de surface (t) et par une direction (3, 4) de l'orientation de la surface, et un flanc de retrait (8, 10) avec lequel la cellule passe en retrait d'une différence de hauteur de surface (t),
    cependant que, dans la structure gaufrée, au moins deux types de cellules (1, 2) sont prévus, lesquels se différencient quant à la direction (3, 4) de l'orientation de la surface et/ou quant à la différence de hauteur de surface (t), et
    cependant que, pour les cellules (1, 2), une couche réfléchissante semi-transparente ou opaque est appliquée,
    cependant que l'élément de sécurité présente à un observateur une information, ce qui a lieu en ce que chaque cellule a l'effet d'un pixel qui, en fonction de l'orientation de la surface de la cellule, est clair ou foncé sous un certain angle d'observation,
    la structure gaufrée est pourvue de couleur, cependant que les cellules (1, 2) sont configurées individuellement et en une coloration différente (11.1-11.3), et cependant que les cellules (1, 2) sont pourvues respectivement d'une surface de couleur (11) qui est plus petite que la surface de la cellule mais qui correspond néanmoins à plus de 50 % de la surface de la cellule.
  15. Procédé selon la revendication 14, adapté à la fabrication d'un élément de sécurité selon une des revendications de 1 à 12.
EP18000582.9A 2017-07-10 2018-07-06 Élément de sécurité à structure d'estampage à 2 dimensions optiquement variable Active EP3427967B1 (fr)

Applications Claiming Priority (1)

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DE102017006513.6A DE102017006513A1 (de) 2017-07-10 2017-07-10 Sicherheitselement mit optisch variabler 2-dimensionaler Prägestruktur

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EP3427967B1 true EP3427967B1 (fr) 2020-09-16

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Family Cites Families (6)

* 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
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
DE102011114645A1 (de) 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Sicherheitselement mit einer optisch variablen Struktur aus Mikrospiegeln
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

Non-Patent Citations (1)

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EP3427967A1 (fr) 2019-01-16

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