EP2385903A1 - Élément de sécurité à structure optiquement variable - Google Patents

Élément de sécurité à structure optiquement variable

Info

Publication number
EP2385903A1
EP2385903A1 EP09801937A EP09801937A EP2385903A1 EP 2385903 A1 EP2385903 A1 EP 2385903A1 EP 09801937 A EP09801937 A EP 09801937A EP 09801937 A EP09801937 A EP 09801937A EP 2385903 A1 EP2385903 A1 EP 2385903A1
Authority
EP
European Patent Office
Prior art keywords
embossing
coating
security element
main surface
element according
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
EP09801937A
Other languages
German (de)
English (en)
Other versions
EP2385903B1 (fr
EP2385903B8 (fr
Inventor
Peter Franz
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 GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2385903A1 publication Critical patent/EP2385903A1/fr
Publication of EP2385903B1 publication Critical patent/EP2385903B1/fr
Application granted granted Critical
Publication of EP2385903B8 publication Critical patent/EP2385903B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • 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
    • B42D2033/24—
    • B42D2035/24—

Definitions

  • the invention relates to a security element with an optically variable structure, a method for producing such a security element and a data carrier equipped with such a security element.
  • data carriers such as banknotes, securities, certificates, vouchers, checks, high-quality tickets, but also other counterfeit securities, such as credit cards, passports and other identity documents, and product security elements, such as labels , Seals and packaging, equipped with optically variable security elements.
  • the protection against counterfeiting is primarily based on the fact that the visually variable effects are visually simple and clear to the human observer, but that they can not be imitated with today's known reproduction devices, since these always reproduce the optically variable elements only from one viewing direction.
  • a data carrier with an optically variable element which consists of an embossed structure and a coating in the form of a printed image or line screen.
  • the embossed structure or the coating are in this case supplemented by a partial change in their structure so that either a reinforcement of the already known optically variable effect occurs or at least one further visually recognizable effect occurs.
  • the entirety of the optically variable effect produced by the combination of background and embossing and the added effect is visually discernible, but can not be reproduced by copiers. It can accordingly as serve information that can be used to check whether this is an original document, or in the presence of the or the optically variable effects can be ruled out that the document was produced using commercially available reproduction techniques.
  • the document WO 2006/018232 relates to a security element with an optically variable structure which has raised embossing elements and a coating combined with the raised embossing elements, in which at least parts of the coating are completely visible when viewed vertically, but obliquely viewed from the plane of the Security element protruding Regelementen be covered.
  • the raised embossing elements are formed by Vietnamese linienf örmige embossing elements, for example by ball sections.
  • the object of the present invention is therefore to provide a generic security element that avoids the disadvantages of the prior art.
  • a security element of the type mentioned in the introduction comprises a carrier with opposite first and second major surfaces and with an optically variable structure present on the first main surface.
  • the optically variable structure has an embossed structure and a coating, wherein the embossed structure and the coating are combined in such a way that at least partial areas of the coating are completely visible when viewed perpendicularly, but hidden when viewed obliquely.
  • the embossed structure is formed in the form of recesses in the first main surface of the carrier, and in the recesses at least portions of the coating are arranged.
  • the present invention differs from the above-mentioned prior art, in particular in that the embossed structure there is composed of embossed elevations on whose flanks a coating is arranged.
  • an embossing structure of recesses is used, as it arises in particular when embossing the opposite second major surface of the security element on the first major surface.
  • the fact that the embossing of elevations on the upper side of a data carrier leads to the generation of negative deformations on the underside of the data carrier is basically known and also described in the cited document WO 2006/018232 on page 23.
  • the negative deformation of the lower data carrier has hitherto always been regarded only as a concomitant of the embossing technique used and has not been associated with an optically variable structure of the relevant data carrier side.
  • the present inventors have recognized that the deformation of the back can be used to produce a self-contained optically variable structure in the embossing of a security element, without the need for a further embossing process would be necessary.
  • This not only allows the effective use of one already for another reason on the opposite Carrier side provided embossed structure, but also an advantageous vote of provided on the front and back optically variable structures.
  • the embossing of the elevations on the front side must be carried out so that the recesses formed on the back have a sufficient depth for the desired optically variable effect.
  • the inventors have further recognized that, alternatively, a direct embossing of negative structures, which could not be achieved with the previously customary printing plates, can be ensured by means of a novel milling of special printing plates by means of laser engraving.
  • the depressions are at least partially linear and are preferably arranged in the form of a line grid.
  • a line or a line-shaped design is understood as meaning a connection between two points in accordance with the usual mathematical definition.
  • This definition includes not only rectilinear but also curved or curved connections.
  • Line-shaped recesses which have a semicircular, triangular, sinusoidal or trapezoidal profile, as described correspondingly in WO 97/17211 for profiles of elevations, are also particularly preferred.
  • the recesses are at least partially non-linear, in particular in the form of a spherical segment, a tetrahedron, a truncated pyramid, a truncated cone, a cylinder section, a torus, an oval, a drop or a pyramid.
  • the depressions are advantageously arranged in the form of a grid, preferably a grid with a constant spatial frequency.
  • the depressions form It is understood that the term "snap point" is understood to mean the usual meaning in printing technology and does not mean a point in the mathematical sense. constant point spacing), amplitude-modulated rasters (variable point size, constant point spacing), frequency-modulated rasters (constant point size, variable point spacing) and also non-periodic higher-order rasters In addition to two-dimensional rasters, one-dimensional rasters (line rasters) are also suitable for the linear depressions The grid points are in this case formed by linear depressions.
  • the depth of the depressions lies in particular between 10 ⁇ m and 250 ⁇ m, preferably between 30 ⁇ m and 120 ⁇ m, particularly preferably between 35 ⁇ m and 80 ⁇ m, in each case based on the non-embossed environment of the depressions.
  • the depressions can also be integrated into a gravure environment.
  • the depth of the recesses is typically between 40% and 60% of the width of the recesses in the case of linear recesses and between 40% and 60% of the smallest lateral dimension in the case of non-linear recesses.
  • the coating is essentially formed from line-shaped basic elements, which are preferably arranged in the form of a line grid.
  • the coating is a full-surface, linear, multi-colored grid structure containing information.
  • the information may in particular consist of a positive and / or negative representation in the form of at least one modulation of the lines of the raster structure.
  • Advantage of such an optically variable structure is that the information contained deflects the coating from registration inaccuracies of the coating. Although registration imperfections within the coating can then still be present, so that the coating appears stained and streaky, an observer focuses more on the information of the coating, so that the inhomogeneous color impression recedes.
  • a modulation of a line is understood here as meaning a change in the design of the line, in particular in terms of shape, color and / or course.
  • a negative representation is a reduction in the thickness of a line
  • a positive representation is a broadening of the thickness of the line.
  • Individual lines of the grid structure are modulated in certain areas in such a way that the impression of a graphical or alphanumeric image is created for a viewer.
  • the lines may also be interrupted or angled, formed from a sequence of short breaks and points, rectangles, symbols or other geometric or alphanumeric shapes or staggered.
  • the lines may vary significantly in their color or saturation, i. H. the layer thickness of their paint job, to be changed.
  • a combination of several of these modulations is possible, such as e.g. a punctuation in a different color or a break in which the space created by the break is partially replenished by a sequence of characters, numbers and dots.
  • the coating is essentially formed from non-linear basic elements, wherein preferably the dimension of a nonlinear basic element in any direction more than four times, in particular in no direction more than twice the dimension of one of the other Directions is. It has been shown that particularly impressive tilting effects of the optically variable structures can be achieved with simultaneously high freedom of design for the coating if the nonlinear basic elements have a shape that does not differ too much from the outline of a circle, triangle or square , In these elements, the dimension in no direction is more than about twice a dimension in one of the other directions.
  • the non-linear primitives advantageously have round, oval, polygonal bounded or defined by a symbol, geometric pattern or alphanumeric characters outline shapes.
  • the nonlinear basic elements are preferably arranged in the form of a one- or two-dimensional grid, preferably a grid with a constant spatial frequency. If the recesses and the nonlinear basic elements are both arranged in the form of a grid, then the spatial frequencies of the two grids can be the same or slightly different in order to produce beat or moire effects. Even by an independent choice of the spatial frequencies of depression grid and Grundianoraster can create attractive optical effects in which a desired information is visible only when viewing the optically variable structure from a certain viewing angle or at a certain angle of incidence.
  • the spatial frequency of the rasters in one dimension is typically 10 lines / cm to 100 lines / cm, preferably 15 lines / cm to 50 lines / cm, more preferably 20 lines / cm to 40 lines / cm. In two-dimensional The spatial frequencies in the two dimensions can be the same or different in grids.
  • the nonlinear basic elements advantageously have a dimension of from 10 ⁇ m to 500 ⁇ m, in particular from 20 ⁇ m to 250 ⁇ m, in all designs.
  • the depressions of the first main surface are produced by embossing the first main surface of the carrier.
  • the embossing structure of the first main surface can be designed as a blind embossing or as an ink-carrying embossing.
  • the recesses of the first major surface may be created by embossing protrusions on the second major surface of the carrier.
  • the embossing of elevations of the second main surface can be implemented as blind embossing or as color-guiding embossing, as explained in more detail below.
  • the non-line-shaped basic elements are advantageously arranged at least partially on flanks of the depressions, wherein a depression and the base elements arranged on their flanks together each form a structural element which, as the smallest units, form the pixels of the information represented by the optically variable structure.
  • the optically variable structure has a multiplicity of structural elements which, when viewed vertically, represent a multicolored image motif whose visual impression varies as the viewing angle changes.
  • the structural elements can correspond to pixels of the multicolor image motif to which certain color components of a color system are assigned.
  • the basic elements in this case have colored surfaces in the colors of the color system, wherein the sizes of the colored surfaces of the basic elements correspond to the respective color component of the image correspond to points.
  • the color impression of the multicolored image motif changes in a characteristic way due to the partial visibility of the basic elements.
  • the image motif is separated into its color components or colors or patterns are reinforced or deformed, as explained in more detail below with reference to exemplary embodiments.
  • the area fraction of the basic elements on the surface of the depressions is typically between 3% and 100%, with high surface coverages being used, above all, in the case of multicolor structural elements.
  • the colored areas may also overlap for higher color coverage.
  • For the basic elements usually between one and four colors are used.
  • Another overpressure can be done for example by screen printing.
  • machine-readable feature substances such as magnetic feature substances, infrared-absorbing or infrared-transparent feature substances, phosphorescent, fluorescent or other luminescent feature substances, can be incorporated into any visually visible color. In this way, the visually verifiable human feature can be combined with machine verifiability.
  • the optically variable structure has additional information which is produced by varying the coating and / or the embossed structure.
  • the additional information for example, by a variation of the shape, the size or the height of the embossing elements, in particular the non-linear embossing elements arise.
  • a variation of the arrangement of the embossing elements, in particular the non-linear embossing elements, such as a regional offset or a region-wise change in the screen width or omitting one or more embossing elements is conceivable.
  • the coating varies in the range of additional information, this can be caused for example by a variation of the shape or the color of the coating.
  • a variation of the arrangement of the coating is also possible here, such as, for example, an offset, a change in the screen ruling, reflection or omission of individual or several basic elements.
  • the embossed structure may additionally be subdivided into partial regions in which different partial embossing structures are arranged.
  • the partial embossing structures are arranged offset in at least two adjoining partial areas by a fraction, in particular a third of the grid width.
  • parts of the partial embossing structures may also have an unembossed edge contour.
  • the data carrier is in particular a value document, such as a banknote, a check, a share, a passport, an admission ticket, a ticket, a certificate, a credit card, a bank card or similar.
  • the optically variable structure according to the invention can be combined with any other security feature within a data carrier.
  • the optically variable structure according to the invention can be attached via a security thread, combined with a hologram or other diffractive structures or adjacent or overlapping with other optically variable structures.
  • the invention further comprises a method for producing a security element, in which
  • a carrier is provided with opposing first and second major surfaces
  • embossed structure and a coating is produced, wherein the embossed structure is formed in the form of depressions in the first main surface of the carrier,
  • the embossed structure and the coating are combined in such a way that at least partial areas of the coating are completely visible when viewed vertically, but are concealed when viewed obliquely.
  • the coating is preferably printed on the carrier and is used in particular in planographic printing, such as in offset printing, in high-pressure printing, for example in letterpress printing or in the flexographic printing process, in US Pat
  • the depressions of the first main surface are produced by embossing the first main surface of the carrier.
  • the embossed structure of the first main surface can be produced by a blind embossing or an ink-carrying embossing.
  • the depressions of the first main surface can be produced by embossing elevations on the second main surface of the carrier, wherein here too the embossing of elevations of the second main surface can be produced by blind embossing or an ink-carrying embossing.
  • the embossing of elevations of the second main surface can be carried out in particular by a gravure printing process.
  • Blind embossings are produced in a printing process using a steel gravure printing plate.
  • the carrier typically a paper substrate
  • the blank embossing areas of the printing plate unlike printed image areas, are not filled with ink, so that the substrate material in these areas is only permanently deformed, ie embossed.
  • blind embossments with appropriate dimensions can also be detected tactilely, whereby the areas with blind embossing can be used as a further security feature.
  • the optically variable effect of the security element is retained, although an ink-bearing embossing is used instead of the blind embossing.
  • the optically variable structure then has a second coating, at least in some areas. This offers the advantage that the embossed structure is stabilized without additional printing and that the security element can be integrated into a gravure motif and thus into the color and representational design of a surrounding motif.
  • the embossed structure is produced with a stamping tool, such as a gravure printing plate, an embossing stamp or a printing plate.
  • a stamping tool such as a gravure printing plate, an embossing stamp or a printing plate.
  • the surface of the embossing tool on recesses which are introduced by mechanical engraving, ablation by means of a laser, scratches, for example with a diamond tip and / or etching in the surface of the embossing tool.
  • the embossing can also be produced by means of thermal processes.
  • a substrate made of plastic is thermally deformed by the action of heat, with finer structures can be displayed than with paper substrate. This method is used in particular for plastic banknotes or debit cards, debit cards, credit cards, SIM cards, customer cards or the like.
  • the substrate material for the security element is any kind of paper, in particular cotton paper.
  • paper which contains a proportion of polymeric material in the range of 0 ⁇ x ⁇ 100% by weight.
  • the substrate material is a plastic film, for. B. a polyester film or a film of PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphtha late), PP (polypropylene), PA (polyamide), PE (polyethylene), is.
  • the film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature. It may also be useful if the substrate material is a multilayer composite having at least one layer of paper or a paper-like material, ie z. B. a paper-film composite. Such a composite is characterized by an extremely high stability, which is for the durability of the substrate or disk of great advantage.
  • a paper-film composite as a substrate has an inner base paper and two outer film layers, as described in more detail in the document EP 1 545 902 B1, the disclosure of which is incorporated into the present description. Also advantageous is the inverse structure of a paper-film composite, in which an inner film is provided with two outer layers of paper.
  • the paper-film composite or composite composite can be z. B. be formed from the aforementioned plastic materials.
  • Such networks are characterized by a very high degree of stability. Also, these composite materials can be used in certain climatic regions of the earth with great advantage.
  • All materials used as substrate material may have additives that serve as a mark of authenticity. It is primarily to think of luminescent, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, for. B. emitting a UV or IR radiation Radiation source, can be excited to produce a visible or at least detectable with auxiliary luminescence. Other security features can also be used to advantage if they do not impair the contemplation of the security element according to the invention or at least do not significantly affect it.
  • protrusions on the second major surface appear as depressions on the first major surface of the carrier (then the back of the data carrier).
  • the carrier may first be provided with the coating and then embossed, or conversely, the carrier may first be embossed and then provided with the coating. Likewise, the carrier can be embossed in the same step and provided with the coating.
  • 1 is a schematic representation of a banknote with a security element according to the invention
  • 2 shows schematically a section along the line II-II of Fig. 1
  • FIG. 3 shows an embossing plate for producing the depressions of the optically variable structure of FIG. 2, FIG.
  • FIG. 5 is a detail of only the coating of the optically variable structure of FIG. 2 in plan view
  • FIG. 6 shows the combination of the embossing structure of FIG. 4 and the coating of FIG. 5, FIG.
  • Fig. 7 shows a detail only of the coating of an optically variable
  • FIG. 8 shows the combination of an embossing structure as in FIG. 4 with the coating of FIG. 7, FIG.
  • FIG. 10 shows a cross section through the optically variable structure along the line XX of FIG. 9, and 11 and 12 are schematic cross-sections through banknotes according to further embodiments of the invention.
  • FIG. 1 shows a banknote 10 with a security element 12 according to the invention, which is arranged in the printed image area of the banknote 10.
  • the security element 12 contains an optically variable structure 16, which presents different information to the viewer under different viewing directions and thus exhibits a tilting effect.
  • Such security elements are often used in banknotes and other monetary documents, since the tilting effect can be easily visually recognized and checked by the viewer, but it can not be reproduced precisely because of the directional dependence of the visual impression with today's copiers, since these optically variable Only show structure from a single point of view.
  • FIG. 2 shows a schematic sectional view along the line II-II of FIG. 1
  • FIG. 4 shows a section of only the coating 24 of the optically variable structure 16 in plan view
  • FIG. 6 shows the combination of the embossing structure 20 of FIG. 4 and the coating 24 of FIG. 5 shows.
  • the recesses 22 may be produced, for example, with the embossing plate 130 shown in FIG. 3, which has the spherical recesses 132 corresponding to the recesses 22. Embossing plates with such spherical segment-shaped elevations are difficult to produce with milling tools, but can be produced by laser engraving.
  • the optically variable structure 16 further includes a coating 24 formed from a plurality of nonlinear pattern primitives 26, 28.
  • the pattern base elements 26, 28 are respectively arranged on the flanks of the recesses 22 and thus give the optically variable structure a different appearance depending on the viewing direction. In the vertical viewing direction 30, the coating 24 is completely visible.
  • the pattern base elements 26 lying on the flanks of the recesses 22 are covered by the webs between the recesses 22 and are therefore largely not visible to a viewer. Accordingly, when viewed from the opposite viewing direction 34, the pattern base elements 28 are hidden and are therefore largely not visible to a viewer.
  • Figures 4 and 5 show for illustrative purposes a section of the embossed structure 20 and the coating 24 of the optically variable structure in plan view, wherein the dashed square grid 40 only serves to provide a clearer view.
  • the depressions 22 and the pattern basic elements 26, 28 are each arranged in a grid with a constant spatial frequency whose horizontal and vertical grid width is generally indicated by values x and y, respectively.
  • the spatial frequency of the basic elements 26, 28 is related to an imaginary reference point 46 in the center of each grid square.
  • the pattern primitives 26, 28 themselves may occupy different positions within the grid squares to come to lie on different flanks of the wells 22 and thereby be visible from different viewing directions 32, 34.
  • a recess 22 together with the pattern element 26 or 28 arranged on its flanks forms a structural element 42 or 44, wherein the structural elements 42, 44 as smallest units form the pixels of the rasterized information altogether represented by the optically variable structure 16.
  • the pattern base elements 26 and 28 come to rest on opposite flanks of the recesses 22 due to their position within the grid squares.
  • the detail shown in FIG. 2 corresponds to the uppermost row of FIG. 6.
  • both the pattern base elements 26 and the pattern base elements 28 and thus the entire coating 24 are visible.
  • the oblique viewing direction 32 only the pattern primitives 28 are visible and only the pattern primitives 26 are visible from the opposite oblique viewing direction 34.
  • the proportion of the visible pattern base elements 26, 28 and thus also the visual impression of the optically variable structure 16 changes.
  • the pattern base elements 26 and 28 can be taken together a partial picture of a total picture. When viewed vertically, the overall image is then visible, but only one of the partial images when viewed obliquely.
  • pattern basic elements can be arranged on the flanks of the recesses 22, and that the shape, color and arrangement of the pattern basic elements set a desired visual impression of the optically variable structure 16 in a top view and oblique view can.
  • the spatial frequency of the raster of the embossed structure and the coating is typically 10 to 100 lines / cm, for example 25 lines / cm, the grid width x or y so 0.1 mm to 1 mm, for example, 0.4 mm.
  • the spatial frequency of the embossing pattern and coating patterns may be the same, as shown in the embodiment of FIGS. 4 to 6, or may also be slightly different in order to produce beating or moire effects.
  • the spatial frequencies of embossing pattern and coating grid can also be selected completely independently of each other, which can produce interesting visual effects in which a desired information is only visible when viewing the security element from a certain viewing angle or at a certain angle of incidence ,
  • the coating 24 consists of nonlinear basic elements 26, 28, the dimension of a non-linear basic element being no more than four times the dimension of one of the other directions in any direction.
  • the non-linear basic elements have in particular a round, oval, polygonal limited or by a symbol, geometric pattern or alphanumeric certain outline shape and typically have dimensions between 10 microns and 500 microns.
  • the optically variable structure 60 contains a multiplicity of structural elements 62 which, when viewed vertically, represent a multicolored image motif which, when tilting the security element depending on the direction of tilting, is divided into the individual color components of a basic color system, such as e.g. , B. the color components Cy, magenta and yellow or combinations of these color components separated.
  • a basic color system such as e.g. , B. the color components Cy, magenta and yellow or combinations of these color components separated.
  • the color components of other known basic color systems can also be used.
  • the coating of the optically variable structure 60 is formed in the form of a square coating grid 50, whose pixels 52 are each assigned to one pixel of the given image.
  • pattern primitives 54-c, 54-m and 54-y are generated whose size corresponds to the color component of the corresponding base color cyan (c), magenta (m) and yellow (y) of the associated pixel of the given image, as shown in FIG. 7 for some such pixels 52.
  • the optically variable structure 60 shown in FIG. 8 is obtained, with one structural element 62 each consisting of a depression 22 and three basic pattern elements 54-c , 54-m and 54-y forms a pixel of the displayed multicolor image motif.
  • one structural element 62 each consisting of a depression 22 and three basic pattern elements 54-c , 54-m and 54-y forms a pixel of the displayed multicolor image motif.
  • all three pattern primitives 54-c, 54-m and 54-y are visible in the recesses 22, so that the predetermined color image with all its color components can be seen.
  • the optically variable structure 60 is tilted, depending on the direction and extent of the tilt, only one or two of the pattern primitives can be seen in the cavities, so that the given color image appears dissected into its color channels for the viewer.
  • the depressions 22 of the embossed structure 20 and the coating 50 formed from the pattern base elements 54-c, 54-m and 54-y cooperate in such a way that, when viewed vertically, the complete color image is visible, while oblique viewing by the obscuring Part of the pattern primitives takes place a color separation of the image.
  • FIGS. 9 and 10 show a further exemplary embodiment of the invention, in which the optically variable structure of the security element comprises a coating 70 and an embossed structure 80.
  • the coating 70 comprises an alternating sequence of three lines 72-c, 72-y, 72-m in the colors cyan (c), yellow (y) and magenta (m).
  • Several of the yellow ones Lines 72-y contain a modulation 74, which is designed in particular in the form of a modulation of the line widths or an interruption of the lines.
  • the outline formed by the modulations 74 gives an observer at a viewing distance of about 30 cm to 50 cm information in the form of an alphanumeric character, in the embodiment in the form of the letter "A".
  • the lines 72c, 72-y, 72-m are not shown in color in FIG. 9, but only in black and white, the individual lines are shown spaced from each other for better distinctness.
  • the lines 72-c, 72-y, 72-m may be directly adjacent to one another, as shown in the cross-section of Fig. 10 along the line XX of Fig. 9, or may have a small distance invisible to the naked eye be arranged.
  • the lines 72-c, 72-y, 72-m thus form linear elements of the coating 70 arranged in the form of a line grid.
  • the embossing structure 80 consists of a plurality of line-shaped recesses 82, which are aligned with the lines 72-c, 72-y, 72-m of the coating 70 and which, based on the surface of the security element, have a depth of 10 ⁇ m to 250 ⁇ m ,
  • the line-shaped recesses 82 have two opposite flanks 84 and 86, which are parallel to the lines 72-c, 72-y, 72-m.
  • each embossing element 82 is a part of the line 72-m in the color magenta and on the opposite edge 86 is a part of the line 72-c in the color cyan ,
  • the middle at the lowest point of the depression 82, is a part of the line 72-y in the color yellow.
  • both inside and outside of the recesses 82 all three lines 72-c, 72-y, 72-m are visible. If an observer looks diagonally from the direction 90 onto the optically variable structure, he sees in the area of the depressions 82 only the flank 86 and the line 72 c of the color cyan arranged thereon.
  • embossing elements 82 gives the viewer a second information in the form of an alphanumeric character, in the embodiment in the form of the letter "V".
  • FIGS. 4 to 10 may advantageously have additional information, not shown, which arises as a result of variation of the coating, in particular by a variation of the shape, color or arrangement of the coating, and / or by varying the embossed structure, in particular by varying the shape of the size, the height or the arrangement of the embossing elements.
  • the coating has been combined with the depressions of an embossing structure which has been impressed into the first main surface of the security element by means of a suitable embossing tool, such as embossing plate 130 shown in FIG. 3. de.
  • a suitable embossing tool such as embossing plate 130 shown in FIG. 3. de.
  • This embossing can be designed both as a blind embossing and as an ink-bearing embossing.
  • the depressions of the first main surface are produced by embossing elevations on the second, opposing main surface of the carrier, as explained below with reference to FIGS. 11 and 12.
  • FIGS. 11 and 12 each schematically show a cross-section through a banknote substrate 100 having a first major surface 102, which is shown in the figures as the underside of the banknote, and with an opposing second major surface 104, which is shown in the figures as the top of the banknote.
  • a plurality of elevations 106 is embossed, wherein the embossing can be embodied both as a blind embossing and as an ink-carrying embossing.
  • the bumps 106 of the second major surface 104 may in particular be combined with a coating 108 present on the second major surface 104 and together form an optically variable structure 110 in which the coating 108 and the bumps 106 cooperate in this way in that at least partial regions of the coating 108 are completely visible when viewed perpendicularly 112, but are concealed during oblique viewing 114, so that the second main surface 104 shows a different visual impression from different viewing directions.
  • Further details of the possible designs and advantages of such a combination of coating 108 and elevations 106 can be found in the publication WO 2006/018232, the disclosure of which is incorporated into the present description to this extent.
  • the backward deformation of the substrate 100 when embossing the elevations 106 is only a concomitant of the embossing technique which, although it can serve as a further authenticity feature due to its haptic detectability, but with the optically variable structure 106, 108 is not related to the front.
  • the indentations 122 resulting from the embossment of the protrusions 106 on the opposing first major surface 102 of the substrate are used to create an optically variable security element without a separate embossing process for the first major surface 102 got to.
  • the optically variable structure 120 present on the first main surface 102 includes, in addition to the depressions 122, a coating formed from a multiplicity of linear or non-linear pattern primitives 124 arranged on the flanks of the depressions 122 and which, in cooperation with the recesses 122, produce the viewing angle dependent appearance of the optically variable structure 120.
  • a coating formed from a multiplicity of linear or non-linear pattern primitives 124 arranged on the flanks of the depressions 122 and which, in cooperation with the recesses 122, produce the viewing angle dependent appearance of the optically variable structure 120.
  • at least partial regions of the coating are completely visible when viewed perpendicularly 126 and are concealed under oblique viewing 128, as already explained above.
  • the statements made in the figures 2 to 10 apply accordingly.
  • the embossing of the second main surface 104 and the type and thickness of the coating are coordinated with one another.
  • the embossing of the elevations 106 of the second main surface 104 is carried out such that depressions 122 with a depth of 10 ⁇ m to 250 ⁇ m, preferably of 30 ⁇ m to 120 ⁇ m, are formed on the first main surface 102.
  • the non-linear elevations 106 are blind embossed as pimple-shaped elevations, and the pattern basic elements 124 of the coating of the first main area 102 represent a predetermined colored image motif described in FIGS. 7 and 8 which, in cooperation with the depressions 122 corresponding to the elevations 106, generates a viewing angle-dependent visual impression on the banknote backside.
  • the optically variable structure 120 of the first main area 102 may also be combined with an optically variable structure 110 present on the second main area 104 with the elevations 106 and the coating 108.
  • the optically variable structures 110, 120 of the front and back can be independent of one another, in particular in the case of opaque substrates, or, in particular in the case of transparent substrates, can also be coordinated with one another and, for example, show information supplementing one another in a transparent view.
  • FIGS. 1 to 12 can also be advantageously arranged in the region of a continuous opening of a data carrier, in particular when using a translucent or transparent substrate.
  • a security element according to the invention in the form of a sentlichen transparent film strip to cover a through hole can be used in a banknote.
  • T L / Lo
  • a "translucent”, “translucent” or “semitransparent” material has a transmittance T greater than 0 and less than 1, i.e. 0 ⁇ T ⁇ 1.
  • the subjective perception of a transparent, translucent, or opaque material by a viewer may in part differ materially from the exact definition given above for transparent, translucent, or opaque material.
  • a viewer may still take a material (security element) as a trans- parent true, if the transmittance of the material (security element) more than z. B. is 0.8, ie, less than 20% of the incident light, for example, be reflected.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un élément de sécurité comportant un support (14) qui présente une première et une deuxième surface principale opposées ainsi qu'une structure (16) optiquement variable sur la première surface principale (18), cette structure présentant un gaufrage (20) et un revêtement (24). Le gaufrage (20) et le revêtement (24) sont combinés de telle sorte qu'au moins des zones partielles du revêtement (24) sont entièrement visibles lorsque qu'on le regarde à la perpendiculaire (30) mais invisibles lorsqu'on le regarde en diagonale (32, 34). Le gaufrage (20) présente des creux (22) dans la première surface principale (18) du support (14), au moins des zones partielles du revêtement (24) étant disposées dans ces creux (22).
EP09801937.5A 2009-01-05 2009-12-17 Élément de sécurité ayant une structure optique variable Active EP2385903B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009004128A DE102009004128A1 (de) 2009-01-05 2009-01-05 Sicherheitselement mit optisch variabler Struktur
PCT/EP2009/009059 WO2010075979A1 (fr) 2009-01-05 2009-12-17 Élément de sécurité à structure optiquement variable

Publications (3)

Publication Number Publication Date
EP2385903A1 true EP2385903A1 (fr) 2011-11-16
EP2385903B1 EP2385903B1 (fr) 2017-07-26
EP2385903B8 EP2385903B8 (fr) 2017-08-30

Family

ID=42102102

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Application Number Title Priority Date Filing Date
EP09801937.5A Active EP2385903B8 (fr) 2009-01-05 2009-12-17 Élément de sécurité ayant une structure optique variable

Country Status (5)

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EP (1) EP2385903B8 (fr)
DE (1) DE102009004128A1 (fr)
HU (1) HUE037016T2 (fr)
RU (1) RU2527184C2 (fr)
WO (1) WO2010075979A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2554397B1 (fr) * 2011-08-05 2014-02-12 ALLTEC Angewandte Laserlicht Technologie Gesellschaft mit beschränkter Haftung Structure de gaufrage
DE102011114645A1 (de) 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Sicherheitselement mit einer optisch variablen Struktur aus Mikrospiegeln
DE102011114644A1 (de) 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Sicherheitselement mit mehreren optisch variablen Strukturen und einem kinematischen Effekt
DE102011114647A1 (de) 2011-09-30 2013-04-04 Giesecke & Devrient Gmbh Sicherheitselement mit mehreren optisch variablen Strukturen
EP2594149A1 (fr) 2011-11-18 2013-05-22 Fabrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Objet comportant une région de sa surface adaptée pour montrer plusieurs images
DE102013000556A1 (de) * 2013-01-14 2014-07-17 Giesecke & Devrient Gmbh Reliefierter kartenförmiger Datenträger
RU2516474C1 (ru) * 2013-04-09 2014-05-20 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Слоистое изделие на бумажной или полимерной основе (варианты) и способ его изготовления
DE102013021806A1 (de) * 2013-12-20 2015-06-25 Giesecke & Devrient Gmbh Sicherheitselemente zur Darstellung zumindest einer optisch variablen Information
DE102014018512A1 (de) * 2014-12-12 2016-06-16 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
EP3391102B2 (fr) 2015-12-18 2023-11-01 Visual Physics, LLC Film de projection d'image monocouche
MX367979B (es) * 2016-11-28 2019-09-12 Banco De Mexico Artículo y método de formación de estructuras embozadas sobre superficies de materiales brillantes que producen movimientos aparentes predeterminados.
DE102017011455A1 (de) 2017-12-12 2019-06-13 Giesecke+Devrient Currency Technology Gmbh An unterschiedliche Kundenwünsche anpassbares Sicherheitselement mit einer optisch variablen Struktur
DE102018007207B4 (de) * 2018-09-12 2020-10-01 Giesecke+Devrient Mobile Security Gmbh Sicherheitsdokument und Verfahren zur Herstellung eines Sicherheitsdokuments
EP4269123A1 (fr) * 2022-04-29 2023-11-01 Thales Dis France SAS Élément de sécurité à couleur variable

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US5538753A (en) * 1991-10-14 1996-07-23 Landis & Gyr Betriebs Ag Security element
DE19541064A1 (de) 1995-11-03 1997-05-07 Giesecke & Devrient Gmbh Datenträger mit einem optisch variablen Element
WO2004030928A1 (fr) * 2002-10-07 2004-04-15 Note Printing Australia Limited Dispositifs estampes a couleurs changeantes
DE102005011612A1 (de) 2004-08-13 2006-02-23 Giesecke & Devrient Gmbh Datenträger mit einer optisch variablen Struktur
DE102006016342A1 (de) * 2006-04-05 2007-10-11 Giesecke & Devrient Gmbh Sicherheitselement

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Also Published As

Publication number Publication date
RU2011132315A (ru) 2013-02-10
EP2385903B1 (fr) 2017-07-26
DE102009004128A1 (de) 2010-07-08
RU2527184C2 (ru) 2014-08-27
EP2385903B8 (fr) 2017-08-30
HUE037016T2 (hu) 2018-08-28
WO2010075979A1 (fr) 2010-07-08

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