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EP3291997A1 - Élément de sécurité optiquement variable - Google Patents

Élément de sécurité optiquement variable

Info

Publication number
EP3291997A1
EP3291997A1 EP16723655.3A EP16723655A EP3291997A1 EP 3291997 A1 EP3291997 A1 EP 3291997A1 EP 16723655 A EP16723655 A EP 16723655A EP 3291997 A1 EP3291997 A1 EP 3291997A1
Authority
EP
European Patent Office
Prior art keywords
segments
security element
curve
output curve
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
EP16723655.3A
Other languages
German (de)
English (en)
Other versions
EP3291997B1 (fr
Inventor
Christian Fuhse
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.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3291997A1 publication Critical patent/EP3291997A1/fr
Application granted granted Critical
Publication of EP3291997B1 publication Critical patent/EP3291997B1/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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/342—Moiré effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • 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
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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

Definitions

  • the invention relates to an optically variable security element for securing valuables, a method for producing such a security element and a correspondingly equipped data carrier.
  • Data carriers such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are thereby equipped with optically variable elements that give the viewer a different image impression at different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • optically variable security elements which show various motion or tilting effects when tilting the security element, such as moving bars, moving pictorial representations, pumping effects or three-dimensional representations.
  • moving bars moving pictorial representations
  • pumping effects or three-dimensional representations.
  • different techniques are used in the prior art with which typically some of these motion effects can be realized particularly well and others less well.
  • ⁇ magnification arrangements based on microfocusing elements and microimages can be used, in particular, to move periodically. see motives are well represented.
  • tilt images or images with an excellent center position ie a view that always looks the same for all produced security elements with the same viewing angle, are often difficult to realize because of the required highly accurate registration of the microfocusing elements and microimages.
  • Holograms can show basically any animations due to interlaced representations that are visible at different tilt angles, but the quality and luminosity of the depictions is strongly dependent on good lighting. The same applies to security elements with micromirror arrangements if the various views of an animation are to be interlaced there, even if micromirror arrangements are as a rule brighter than holograms.
  • optically variable effects are often difficult to individualize, that is, for example, vote on a particular currency or a specific value.
  • a widespread possibility of individualization consists in a demarcated demetallization, in which an effect layer is partially omitted, for example in the form of a value number.
  • negative texts are relatively inconspicuous, which increases the risk that a counterfeiter, for example, a real security element a low value banknote used to counterfeit a higher value banknote without attracting the untrained or casual observer.
  • the present invention seeks to provide a security element of the type mentioned above, which shows a novel and significantly different from conventional effects optically variable effect.
  • the optically variable effect also allows a striking and easily recognizable individualization of the security element or of the data carrier provided with it.
  • a generic security element depicts, depending on the viewing angle, a motif having at least one curve which is visible from a first viewing direction as an initial curve with two or more contiguous, non-collinear segments and which decays into the individual segments when the security element is tilted about a predetermined axis. in that the segments of the output curve move alternately in different directions away from the output curve.
  • the security element in this case has a planar motif area with a plurality of optically effective elements which direct incident light in each case in a preferred direction, the segments of the initial curve in the planar motif area being respectively assigned a movement segment in the form of a partial area of the areal area of the area, in that the optically active elements are arranged and oriented such that they show the output curve with the connected segments from the first viewing direction, and that they display curve views from viewing directions tilted about the predetermined axis, in which the segments alternate in different directions and with increasing tilt angle are increasingly further away from the output curve.
  • the contiguous segments of the initial curve are not collinear, that is, they are not all on a straight line.
  • at least two of the contiguous segments of the output curve are not on a straight line. This also does not preclude that spaced-apart segments are parallel to one another, such as the two diagonally-connected cover strokes of the letter "Z".
  • At least one curve representation of the motif decays when tilting the security element into three or more, preferably four or more, or even six or more segments. Since the segments move alternately in different directions from the output curve when tilting the security element, the moving segments are no longer contiguous but initially adjacent, so that the visual impression of a disintegrating into the individual segments curve is formed.
  • the output curve of at least one graph advantageously shows an alphanumeric character, a symbol, such as the euro symbol or another currency symbol, or another information-bearing character.
  • two or more output curves may also be provided, which together form a number, such as the value of a banknote, a sequence of letters or a symbol sequence.
  • the motion segments of the graphs advantageously have a width that is between 10% and 100%, preferably between 20% and 50% of the extent of the output curve of the graph.
  • the width of the movement segments is the extension of the movement segments perpendicular to the associated segment of the output curve.
  • the motion segments advantageously all have the same width.
  • the optically active elements direct incident light in each case in a preferred direction, wherein the mechanism of the light deflection depends on the type of optically active elements.
  • the optically active elements may be reflective facets that form small micromirrors which direct incident light into a preferred direction given by the condition "angle of incidence equal to the angle of reflection".
  • angle of incidence equal to the angle of reflection.
  • refraction of light for example by lens elements or prism elements, or light diffraction, for example by hologram grating areas into consideration.
  • the light deflection through the optically active elements can take place in reflection, in transmission or both in reflection and in transmission.
  • the optically active elements are formed by radiation-optically acting facets whose orientation is characterized in each case by an inclination angle ⁇ against the plane of the areal area and by an azimuth angle ⁇ in the plane of the areal area.
  • the dimension of the facets is preferably so great that no or hardly diffraction effects occur, so that the facets essentially act only radiation optical.
  • the facets advantageously have a smallest dimension of more than 2 ⁇ m, preferably of more than 5 ⁇ , in particular of more than 10 ⁇ on.
  • the facets preferably have a height below 100 ⁇ , preferably below 50 ⁇ , in particular less than 10 ⁇ .
  • the facets can be arranged regularly, for example in the form of a 1- or 2-dimensional periodic grid, for example a sawtooth grid, or else aperiodically.
  • the optically active elements can also be advantageously formed by diffraction grating fields with a grid pattern of parallel grating lines.
  • the preferred direction of the light deflection is given by the lattice parameters of the lattice pattern, in particular by the lattice period ⁇ and the azimuth angle ⁇ , which indicates the angle which the lattice lines of the lattice pattern enclose with a reference direction.
  • the optically active elements are formed by trough-shaped and / or rib-shaped structural elements extending next to each other and extending along a longitudinal direction, as described more precisely in WO 2014/117938 Al, the disclosure of which is incorporated into the present document Registration is received.
  • the areal motif area can be designed to be reflective, so that the initial curve and the decay of the initial curve are visible in individual segments in reflection.
  • the optically active elements are formed by reflection elements, which are molded into an embossing lacquer and with a reflection-enhancing coating are provided.
  • the reflection-increasing coating can be formed by a metallization and / or can have a color shift effect, in which case the coating advantageously consists of a thin-film interference layer system with reflector, dielectric spacer layer and absorber.
  • the planar motif region can also be at least partially transmissive so that the output curve and the decay of the output curve are visible in individual segments in transmission.
  • the two-dimensional motive region can also be designed to be partially reflective as well as partially transmissive, so that the output curve and the decay of the output curve into individual segments are visible both in reflection and in transmission.
  • the optically active elements are formed by transmission elements in the form of transparent or semitransparent diffraction structures, transparent or semitransparent prismatic structures or transparent or semitransparent microrelief structures. As already mentioned above, the transmission elements can at the same time have reflective properties and thus produce an additional motion effect in reflection.
  • the motif of the security element contains at least a second curve view, which is visible from a second viewing direction as a second output curve with two or more contiguous, non-collinear segments, and the tilting of the security element about the predetermined axis into the individual segments decays by the segments of the second output curve alternately in different directions move away from the second output curve, wherein the segments of the second output curve in the two-dimensional motif area in each case a second movement segment is assigned in the form of a portion of the area motif area in which the optically active elements are arranged and aligned so that they from the second viewing direction show second output curves with the contiguous segments, and that they show curve views from viewing directions tilted about the predetermined axis, in which the segments lie alternately in different directions and with increasing tilt angle progressively farther from the second output curve.
  • the movement segments of the first and second curves do not overlap.
  • the first and second viewing directions advantageously include an angle of at least 5 °, preferably at least 10 ° and particularly preferably at least 20 °.
  • At least one segment of the first curve representation is also a segment of the second curve representation, so that the second curve representation when tilting the security element at least partially composed of segments of the decayed first curve representation.
  • the motif of the security element can likewise contain more than two curve representations, which are visible from different viewing directions as coherent initial curves.
  • the security element advantageously represents a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, value document or the like.
  • the invention also includes a data carrier with a security element of the type described, wherein the security element can be arranged both in an opaque region of the data carrier as well as in or over a transparent window area or a through opening of the data carrier.
  • the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but also an identity card such as a credit card, a bank card, a cash card, an entitlement card, an identity card, or a pass personalization page.
  • the invention further includes a method for producing an optically variable security element of the type described above, wherein a desired output curve is defined with two or more contiguous, non-collinear segments, for the segments of the output curve each motion segments are defined in which the segments of the Move the output curve when tilting the security element, and in a planar motif area in the fixed motion segments, optically active elements are arranged and aligned so as to show the initial curve with the connected segments from the first viewing direction, and that they are viewed from directions tilted about the predetermined axis
  • FIG. 2 shows in (a) to (e) the appearance of the optically variable security element of FIG. 1 at different tilt angles between -20 ° and + 20 °, FIG.
  • Fig. 3 shows the graphs of the digits "5" and "0" of the value number
  • FIG. 1 shows a schematic plan view of a two-dimensional motif area, which shows a representation of the value "50” as a detail of the security element of FIG. 1,
  • FIG. 5 schematically shows two of the movement segments of the number "5" of FIG.
  • FIG. 9 in (a) to (i) show the visual appearance of a security element according to a further exemplary embodiment of the invention at different tilt angles
  • FIG. 10 shows the values of the orientation parameter k for the embodiment of FIG. 9 in grayscale representation.
  • FIG. 1 shows a schematic representation of a banknote 10 with an optically variable security element 12 according to the invention in the form of a wide security strip applied to the banknote substrate.
  • the invention is not limited to security strips and banknotes, but can be used in all types of security elements, such as labels on goods and Packaging or in the security of documents, ID cards, passports, credit cards, health cards and the like.
  • security threads or transfer elements may be considered in addition to security strips.
  • the security strip 12 has a metallic appearance and, when viewed perpendicularly, shows the value number "50" spaced several times above the other.
  • Each representation of the value number "50” consists of two graphs 14 A, 14 B, which are each formed of contiguous line trains "5" and "0".
  • the curves 14A, 14B are visible in vertical plan as a light lines in front of the slightly darker, but also shiny metallic background of the security strip 12. This visual impression when viewed perpendicularly is shown in more detail in FIG. 2 (c).
  • the security strip 12 When tilting 16A, 16B of the banknote 10 about its longitudinal axis, the security strip 12 shows a striking visual effect:
  • the originally connected curves 14A, 14B also referred to as output curves, disintegrate for the viewer into a plurality of individual segments 18, which increase with increasing Tilt alternately in different directions away from the respective output curve.
  • FIG. 2 shows, by way of example, five tilt positions with a different visual impression.
  • inventions contain Corresponding security elements often much more, for example, 6 to 20 tilt positions with different visual impression.
  • FIG. 4 is a schematic plan view of a sheet-like motif region
  • FIG. 5 illustrates two of the motion segments of FIG. 4 in detail
  • FIGS. 6 and 7 each show a cross section through the planar motif region of FIGS. 4 and 5 along the lines VI-VI and VII-VII of Fig. 5 show.
  • each of the two output curves in the form of the numerals "5" and "0" consists of a plurality of contiguous, non-collinear segments 18.
  • Each of these segments 18 is within the areal motif area 20 subregion 22 assigned, in which the segment 18 seems to move when tilting the security element 12 and therefore hereinafter referred to as a movement segment 22.
  • the motion segments 22 extend from the output curve perpendicularly substantially equally to both sides, the width of the segments advantageously being between 20% and 50% of the extension of the output curve.
  • FIG. 4 also shows in each case the output curves 14A and 14B, the contiguous segments of which are in the middle of the movement segments 22 in the exemplary embodiment.
  • the areal motif area 20 contains a plurality of optically active elements in the form of reflective facets 30, which.
  • a base of 15 ⁇ x 15 ⁇ and a maximum height of about 5 ⁇ have.
  • the facets 30 are tilted at different angles in the y-direction, that is, along the tilting directions 16A, 16B, and reflect incident light in a preferred direction, which is defined for each facet 30 by the condition " Angle of incidence equal to failure angle "is given.
  • the reflection condition "angle of incidence equal to the angle of deflection" in the movement segment 22A is for upwardly (in + y direction) offset facets 34 and in the motion segment 22B for down (in -y direction) offset facets 34 fulfilled.
  • the segments 18 of the curve representation 14A visible in the movement segments 22A, 22B therefore run away from the output curves for the observer when tilted in the opposite direction and move away from one another.
  • the occupation with optically variable elements described as an example for the movement segments 22A, 22B is correspondingly also carried out for the other movement segments 22 of the surface region 20, so that the angles of inclination of the facets 30 in adjoining movement segments each change in an opposite manner.
  • the segments 18 of the output curves 14A, 14B run alternately in different directions for the observer along the output curves, so that the output curves appear to disintegrate upon tilting of the security element.
  • orientation parameter k the shape of the movement segments and the movement behavior of the segments in tilting can be described independently of the concrete realization of the optically active elements.
  • the segments are separated and show a representation of the decayed output curve.
  • the orientation parameter k within each of the motion segments 22 alternately runs from -1 to +1 or from +1 to -1.
  • the orientation parameter in motion segment 22A travels from -1 to +1 from the bottom to the top, while it travels from +1 to -1 in the adjacent motion segment 22B from the bottom to the top. As shown in FIG. 8, this alternate progression continues throughout the graph.
  • the facets of a planar motif area can be unambiguously described for a given size of the facets.
  • a corresponding reflective surface region 20 can then be produced, for example, by embossing the facets thus described into an embossing lacquer layer and subsequent metallization in a manner known per se.
  • this angular range determines a line thickness below which the output curve and the decaying segments appear.
  • the specification of the k values for a desired motif can be carried out by means of suitable mathematical algorithms, for example the fc value can increase in proportion to the distance of the segments from the output curve.
  • the values can also be generated by hand by a designer as a color gradient in a design sheet.
  • the value of the orientation parameter increases in proportion to the distance of a segment from the output curve to the edge of the movement range to +1 or decreases to -1, as shown in the embodiment of FIG. 8.
  • the relationship between the orientation parameter and the distance to the output curve can of course also be non-linear.
  • the line width or the dynamics of movement can be varied depending on the tilt angle.
  • the k values can vary very much around the fe value of the output curve, so that a sharp representation of the output curve is achieved.
  • the fc value can then vary more slowly, increasing the line width and increasing the dynamics.
  • the fc value does not run through the entire range between -1 and +1 in all segments. For example, if the fc value in a segment runs only up to an fc value of +0.5, the segment appears to disappear on tilting in viewing angles, which correspond to fc values above 0.5, since then no optically effective Elements are present that guide incident light toward the observer at these viewing angles.
  • the orientation parameter fc can be linked to the azimuth angle ⁇ and / or the grating period p of the hologram grating regions, for example in the form
  • microrelief structures with channel-shaped and / or rib-shaped structural elements can also be used as optically active elements, as described, for example, in document WO 2014/117938 A1, the disclosure content of which is incorporated in the present application.
  • the orientation parameter k can be linked in this case, for example, with the azimuth angle of the structural elements.
  • optically active elements in addition to reflective facets, hologram gratings and micro-relief structures, other optically active elements can be used. In the context of the invention, it is only important that a viewer when tilting the described moving segments show, no matter whether they are bright, dark, colored or otherwise visible, and whether this is done in up or see through.
  • microlens or micro-cavity louvres can also be used as optically active elements which, together with line patterns, bring about moire magnification effects.
  • the line patterns have approximately the same period as the microlens or micromirror grids and are arranged approximately in the focal plane of the microlenses or micromill mirrors.
  • the microlenses or micro-cavities direct incident light in a direction, depending on the viewing angle, on or beside the lines, so that they are detected by an observer either in the color of the lines or in the color of the spaces. seem to be.
  • the orientation parameter k in this case indicates how far the line pattern is locally shifted with respect to the grid of the microlenses or hollow micro-mirrors. For example, the center of the lines of the line grid at an fc value of -1 at a first edge of the individual microlenses and at a / c value of +1 at a second edge of the microlenses opposite to the first edge lie.
  • the described motion effects can be generated not only in supervision, but also for a viewing in transparency. If, for example, the facets are not embedded in a material with the same or a very similar refractive index, they will look like small prisms, so that differences in brightness in the transmitted light result and an inventive motion effect can be produced in transmitted light.
  • a thin, semitransparent coating for example a thin metal layer
  • the same embossed structures as reflective facets generate a movement effect according to the invention in plan view and at the same time, with the action of microprisms, additionally produce a movement effect according to the invention.
  • the above-mentioned microrelief structures and hologram gratings may also be coated semitransparent, for example with a very thin metal layer, or high-refractive transparent, for a viewing view.
  • the described concept is incorporated in so-called RollingStar® security threads or LEAD strips with micromirrors. sets, ie in versions with facets or micromirrors, which are embossed with embossing heights of a maximum of 5 ⁇ in an embossing lacquer and then metallized.
  • the metallization is advantageously carried out with a thin metal film or a color-tilting thin-film coating with the layer sequence reflector / dielectric / absorber.
  • FIGS. 9 and 10 illustrate a further embodiment of the invention in which several curve representations from different viewing directions are visible as output curves with contiguous line segments.
  • the security element in the embodiment shows a metallic appearance, in which from a first viewing direction the value number "50" and from a second viewing direction, the letter sequence "PL" are several times above the other visible.
  • FIGS. 9 (a) to (i) illustrate the visual appearance of a section of a two-dimensional motif area 50, which shows on the one hand the decaying value number "50" and, on the other hand, the decaying letter sequence "PL" at different tilt angles.
  • FIG. 10 shows the values of the orientation parameter k for this exemplary embodiment in a gray scale representation 60.
  • the representation of the value "50” also contains in this embodiment, the already described in detail curve graphs 14A, 14B in the form of the digits "5" and "0".
  • the representation of the letter sequence “PL" contains the curves 54A, 54B in the form of the letters "P" and "L”. Since the output curves in this embodiment are not visible from the same, but from different viewing directions are intended, the output curves are assigned to different values of the orientation parameter k. Specifically, the output curves of the value "50” correspond to an fc value of +0.5, and the output curves of the lettering "PL" correspond to an fc value of -0.5.
  • motion segments 22 of the segments 18 of the value number "50” contain only k values between 0 and 1
  • motion segments 52 of the segments 58 of the letter sequence "PL" contain only k values between -1 and 0, as shown in FIG. 10 illustrates.
  • the segments 18 of the value number "50" are visible only when tilted down, since the associated motion segments 22 do not contain k values greater than 0.
  • the segments 58 of the letter sequence "PL” are only visible when tilted upward, since the associated motion segments 52 do not contain k values smaller than 0.
  • the value "50” arises, which in turn tilts up when tipping ( Figures 9 (a) to (i)).
  • tilting back shows a reverse motion sequence.
  • the motion segments 22, 52 and the segments 18, 58 of the two partial representations are particularly advantageously matched to one another so that individual segments run continuously from motion segments of the first representation into movement segments of the second representation.
  • the overall representation then contains a common range of motion, in which one or more segments move in such a way that they are part of the first representation of the first viewing direction and part of the second representation of the second viewing direction. In this way, the visual impression can be generated that segments of the decaying first representation reassemble to the present second representation.
  • FIG. 10 shows a combined movement segment 56 with k values from -1 to +1, at which a segment 58C of the letter "P" runs up when tilted (Figs. 9 (c) and 9 (d)) and to a segment 18C of the numeral "50". becomes as shown in Figs. 9 (f) and 9 (g).

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Abstract

L'invention concerne un élément de sécurité optiquement variable (12), destiné à sécuriser des objets de valeur, qui présente en fonction de l'angle d'observation un motif comportant au moins une représentation de courbes (14A, 14B), qui est visible dans une première direction d'observation sous la forme d'une courbe de départ comportant deux ou plusieurs segments (18) non colinéaires et contigus et qui se divise en segments individuels (18) lorsque l'élément de sécurité (12) est incliné sur un axe prédéterminé en raison du fait que les segments (18) de la courbe de départ s'écartent alternativement de la courbe de départ dans différentes directions, une zone de motif plane (20) pourvue d'une pluralité d'éléments optiquement actifs (30, 32, 34, 36) qui dirigent chacun la lumière incidente dans une direction préférentielle. Un segment de déplacement (22) sous la forme d'une partie de la zone de motif plane (20) est associé à chacun des segments (18) de la courbe de départ, segment de déplacement dans lequel les éléments optiquement actifs (30, 32, 34, 36) sont disposés et orientés de façon à présenter depuis la première direction d'observation la courbe de départ pourvue des segments contigus (18) et à présenter dans des directions d'observation inclinées autour l'axe prédéterminé des représentations de courbes dans lesquelles les segments (18) se trouvent alternativement dans différentes directions et à des distances croissantes la courbe de départ à mesure que l'angle d'inclinaison croît.
EP16723655.3A 2015-05-07 2016-05-04 Élément de sécurité optiquement variable Active EP3291997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015005911.4A DE102015005911A1 (de) 2015-05-07 2015-05-07 Optisch variables Sicherheitselement
PCT/EP2016/000733 WO2016177470A1 (fr) 2015-05-07 2016-05-04 Élément de sécurité optiquement variable

Publications (2)

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EP3291997A1 true EP3291997A1 (fr) 2018-03-14
EP3291997B1 EP3291997B1 (fr) 2020-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16723655.3A Active EP3291997B1 (fr) 2015-05-07 2016-05-04 Élément de sécurité optiquement variable

Country Status (6)

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US (1) US10081213B2 (fr)
EP (1) EP3291997B1 (fr)
CN (1) CN107848320B (fr)
AU (1) AU2016256954B2 (fr)
DE (1) DE102015005911A1 (fr)
WO (1) WO2016177470A1 (fr)

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FR3066954B1 (fr) * 2017-06-06 2019-11-01 Surys Composant optique de securite visible en reflexion, fabrication d'un tel composant et document securise equipe d'un tel composant
DE102017006421A1 (de) * 2017-07-07 2019-01-10 Giesecke+Devrient Currency Technology Gmbh Optisch variable Sicherheitsanordnung
GB2573816B (en) 2018-05-18 2021-06-09 De La Rue Int Ltd Security device and method of manufacture thereof
DE102018008146A1 (de) * 2018-10-15 2020-04-16 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit Mikroreflektoren zur perspektivischen Darstellung eines Motivs
ES2980422T3 (es) 2018-12-21 2024-10-01 Karmic Sarl Dispositivo para mostrar una o más imágenes transitorias de microestructuras tridimensionales y usos de dicho dispositivo
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DE102019008250A1 (de) * 2019-11-27 2021-05-27 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit kippungsabhängiger Motivdarstellung
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Also Published As

Publication number Publication date
DE102015005911A1 (de) 2016-11-10
US20180117949A1 (en) 2018-05-03
AU2016256954B2 (en) 2020-11-26
AU2016256954A1 (en) 2017-12-21
EP3291997B1 (fr) 2020-11-11
US10081213B2 (en) 2018-09-25
CN107848320B (zh) 2019-11-19
WO2016177470A1 (fr) 2016-11-10
CN107848320A (zh) 2018-03-27

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