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EP3291997B1 - Élément de sécurité optiquement variable - Google Patents

Élément de sécurité optiquement variable Download PDF

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Publication number
EP3291997B1
EP3291997B1 EP16723655.3A EP16723655A EP3291997B1 EP 3291997 B1 EP3291997 B1 EP 3291997B1 EP 16723655 A EP16723655 A EP 16723655A EP 3291997 B1 EP3291997 B1 EP 3291997B1
Authority
EP
European Patent Office
Prior art keywords
segments
curve
security element
initial 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.)
Active
Application number
EP16723655.3A
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German (de)
English (en)
Other versions
EP3291997A1 (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
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Giesecke and Devrient Currency Technology GmbH
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Publication date
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Publication of EP3291997A1 publication Critical patent/EP3291997A1/fr
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/342—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 protecting objects of value, a method for producing such a security element and a correspondingly equipped data carrier.
  • Data carriers such as value or identity documents, or other objects of value, such as branded items, are often provided with security elements for protection that allow the authenticity of the data carrier to be checked and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing angle-dependent effects play a special role in securing authenticity, since these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements which give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and / or a different graphic motif depending on the viewing angle.
  • optically variable security elements which, when the security element is tilted, show various movement or tilting effects, such as moving bars, moving pictorial representations, pumping effects or three-dimensional representations.
  • movement or tilting effects such as moving bars, moving pictorial representations, pumping effects or three-dimensional representations.
  • different techniques are used in the prior art, with which some of these movement effects can typically be implemented particularly well and others less well.
  • Holograms can basically show any animation through nested representations that are visible at different tilt angles, but the quality and luminosity of the representations are heavily dependent on good lighting. The same applies to security elements with micromirror arrangements if the different views of an animation are to be nested in one another there, even if micromirror arrangements are generally more luminous than holograms.
  • a safety device which includes at least two lenticular devices, each lenticular device having an array of elongated lenticular focusing elements each disposed over a set of image strips.
  • the longitudinal directions in which the lens-shaped focusing elements of the two lenticular devices extend are different.
  • the pamphlet EP 1 710 756 A1 describes a printed image which is in the form of an array of magnetically aligned platelets or flakes of uniform shape and size, the magnetic platelets being arranged to produce optically illusory images that can serve as security devices.
  • optically variable effects mentioned are often difficult to individualize, that is to say, for example, they can be adapted to a specific currency or a specific value.
  • a widespread possibility of individualization is demetallization in certain areas, in which an effect layer is left out in some areas, for example in the form of a number.
  • Such negative texts are, however, comparatively inconspicuous, which increases the risk that a forger will, for example, misuse a genuine security element of a lower denomination banknote is used to counterfeit a higher denomination banknote without the untrained or casual observer noticing.
  • the invention is based on the object of specifying a security element of the type mentioned at the outset which exhibits a novel, optically variable effect that clearly stands out from conventional effects.
  • the optically variable effect also enables a conspicuous and easily memorable individualization of the security element or of the data carrier provided with it.
  • a generic security element shows, depending on the viewing angle, a motif with at least one curve representation, which is visible from a first viewing direction as an output curve with two or more contiguous, non-collinear segments, and which breaks down into the individual segments when the security element is tilted about a predetermined axis, in that the segments of the exit curve move alternately in different directions away from the exit curve.
  • the security element has a planar motif area with a plurality of optically effective elements which each direct incident light in a preferred direction, the segments of the output curve in the planar motif area being assigned a movement segment in the form of a sub-area of the planar motif area, in which the optically effective elements are arranged and aligned in such a way that they show the starting curve with the connected segments from the first viewing direction, and that they show curve representations from the 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 starting curve.
  • the connected segments of the output curve are not collinear, that is, they do not all lie on a straight line. At least two of the connected segments of the starting curve are not on a straight line. This also does not rule out that segments spaced apart from one another are parallel to one another, such as the two cover lines of the letter "Z" connected by the diagonal.
  • At least one curve representation of the motif preferably breaks down into three or more, preferably four or more, or even six or more segments when the security element is tilted. Since the segments move alternately in different directions away from the starting curve when the security element is tilted, the moving segments are no longer contiguous but are initially still adjacent, so that the visual impression of a curve breaking up into the individual segments is created.
  • the output curve of at least one curve display advantageously shows an alphanumeric character, a symbol, such as the euro symbol or another currency symbol, or another information-carrying character.
  • two or more output curves can also be provided which together form a number, such as a banknote's value number, a sequence of letters or a sequence of symbols.
  • the movement segments of the curve representations advantageously have a width that is between 10% and 100%, preferably between 20% and 50% of the extent of the initial curve of the curve representation.
  • the extension of the movement segments perpendicular to the associated segment of the starting curve is referred to as the width of the movement segments.
  • the movement segments advantageously all have the same width.
  • the optically effective elements each direct incident light in a preferred direction, the mechanism of light deflection depending on the type of optically effective elements.
  • the optically effective elements can be reflective facets that form small micromirrors that direct incident light in a preferred direction given by the condition “angle of incidence equals angle of reflection”.
  • light refraction for example by lens elements or prism elements, or light diffraction, for example by hologram grating areas, can also be considered.
  • the light deflection by the optically effective elements can take place in reflection, in transmission or both in reflection and in transmission.
  • the optically effective elements are formed by radiation-optically acting facets, the orientation of which is characterized by an angle of inclination ⁇ relative to the plane of the flat motif area and an azimuth angle ⁇ in the plane of the flat motif area.
  • the dimensions of the facets are preferably so large that no or hardly any diffraction effects occur, so that the facets essentially only have a radiation-optical effect.
  • the facets advantageously have a smallest dimension of more than 2 ⁇ m, preferably of more than 5 ⁇ m, in particular of more than 10 ⁇ m.
  • the facets preferably have a height of less than 100 ⁇ m, preferably less than 50 ⁇ m, in particular less than 10 ⁇ m.
  • 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 advantageously be formed by diffraction-optically acting grating fields with a grating pattern made up of parallel grating lines.
  • the preferred direction of the light deflection is given by the grating parameters of the grating pattern, in particular by the grating period p and the azimuth angle ⁇ , which specifies the angle that the grating lines of the grating pattern enclose with a reference direction.
  • the optically effective elements are formed by channel-shaped and / or rib-shaped structural elements lying next to one another and extending along a longitudinal direction, as they are, for example, in the publication WO 2014/117938 A1 are described in more detail, the disclosure content of which is included in the present application.
  • the flat motif area can be designed to be reflective, so that the output curve and the breakdown of the output curve into individual segments are visible in reflection.
  • the optically effective elements are formed by reflection elements that are molded into an embossing lacquer and with a reflection-increasing 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 flat motif area can also be at least partially transmitting, so that the output curve and the breakdown of the output curve into individual segments are visible in transmission.
  • the flat motif area can also be designed to be partially reflective as well as partially transmissive, so that the output curve and the breakdown of the output curve into individual segments are visible both in reflection and in transmission.
  • the optically effective elements are formed by transmission elements in the form of transparent or semitransparent diffraction structures, transparent or semitransparent prismatic structures or transparent or semitransparent micro-relief structures.
  • the transmission elements can at the same time have reflective properties and thus generate an additional movement effect in reflection.
  • the motif of the security element contains at least one second curve representation, which is visible from a second viewing direction as a second output curve with two or more contiguous, non-collinear segments, and which is visible when the security element is tilted around the predetermined axis is broken down into the individual segments in that the segments of the second output curve alternate in different directions move away from the second output curve, the segments of the second output curve in the planar motif area each being assigned a second movement segment in the form of a sub-area of the planar motif area in which the optically effective elements are arranged and aligned so that they are the show second output curve with the connected segments, and that they show curve representations from viewing directions tilted about the predetermined axis, in which the segments are located alternately in different directions and increasingly further away from the second output curve as the tilt angle increases.
  • the movement segments of the first and second curve display do not overlap.
  • the first and second viewing directions advantageously enclose an angle of at least 5 °, preferably at least 10 ° and particularly preferably at least 20 °.
  • At least one segment of the first curve display is also a segment of the second curve display, so that when the security element is tilted, the second curve display is composed at least partially of segments of the disintegrated first curve display.
  • the motif of the security element can in the same way also contain more than two curve representations, which are visible from different viewing directions as coherent output curves.
  • the security element advantageously represents a security thread, a tear-open thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
  • the invention also contains a data carrier with a security element of the type described, wherein the security element can be arranged both in an opaque area of the data carrier and in or above a transparent window area or a continuous opening of the data carrier.
  • the data carrier can in particular be a value document, such as a bank note, in particular a paper bank note, a polymer bank note or a film composite bank note, a share, a bond, a certificate, a voucher, a check, a high-quality admission ticket, but also an identity card such as a credit card, a bank card, a cash card, an authorization card, an identity card or a passport personalization page.
  • 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 bank notes, but can be used with all types of security elements, for example with labels on goods and Packaging or for securing documents, ID cards, passports, credit cards, health cards and the like.
  • security threads or transfer elements can also be used, for example, in addition to security strips.
  • the security strip 12 has a metallic appearance and, when viewed vertically, shows the number "50" spaced several times one above the other.
  • Each representation of the value number “50” consists of two curve representations 14A, 14B, which are each formed from contiguous lines “5” and “0”, respectively.
  • the curve representations 14A, 14B can be seen in a vertical plan view as light lines in front of the somewhat darker, but likewise shiny metallic background of the security strip 12. This visual impression when viewed vertically is in Fig. 2 (c) shown again in more detail.
  • the security strip 12 shows an astonishing optical effect:
  • Figures 2 (a) and (b) the appearance of the security element 12 with a tilt of 20 ° or 10 ° downwards (tilting direction 16A), while the Figures 2 (d) and (e) show the visual appearance with a tilt of 20 ° or 10 ° upwards (tilting direction 16B).
  • Overall shows Fig. 2 for example five tilt positions with different visual impressions.
  • Security elements often significantly more, for example 6 to 20 tilt positions with different visual impressions.
  • Fig. 3 shows the curve representations 14A, 14B of the value number "50" with segments 18 somewhat separated from one another for illustration purposes
  • Fig. 4 is a schematic plan view of a planar motif area 20, which is a section of the security element 12 of FIG Fig. 1 forms
  • Fig. 5 two of the motion segments of Fig. 4 represents in detail and the Figures 6 and 7 each a cross-section through the flat motif area of Figures 4 and 5 along the lines VI-VI and VII-VII of the Fig. 5 demonstrate.
  • each of the two output curves in the form of the digits “5” and “0” consists of several connected, non-collinear segments 18.
  • Each of these segments 18 is a sub-area within the flat motif area 20 22, in which the segment 18 appears to move when the security element 12 is tilted and which is therefore referred to below as the movement segment 22.
  • the movement segments 22 extend perpendicularly from the output curve essentially equally on both sides, the width of the segments advantageously being between 20% and 50% of the extension of the output curve.
  • FIG. 12 also shows the output curves 14A and 14B, the connected segments of which lie in the center of the movement segments 22 in the exemplary embodiment.
  • the planar motif area 20 contains a plurality of optically effective elements in the form of reflective facets 30, which in the exemplary embodiment have a base area of 15 ⁇ m ⁇ 15 ⁇ m and a maximum height of approximately 5 ⁇ m.
  • the facets 30 are inclined at different angles in the y-direction, ie along the tilting directions 16A, 16B, and reflect incident light in a preferred direction which is given for each facet 30 by the condition "angle of incidence equals angle of reflection".
  • angle of incidence equals angle of reflection
  • the reverse is true for tilting a few degrees upwards in the tilting direction 16B.
  • the segments 18 of the curve representation 14A visible in the movement segments 22A, 22B therefore run away from the initial curves in the opposite direction for the viewer when tilted and move away from one another.
  • the occupation with optically variable elements described by way of 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 change in opposite ways.
  • the segments 18 of the exit curves 14A, 14B run alternately in different directions for the viewer along the exit curves, so that the exit curves appear to disintegrate when the security element is tilted.
  • orientation parameter k By using a general orientation parameter k , the shape of the movement segments and the movement behavior of the segments when tilted can be described independently of the actual implementation of the optically effective elements.
  • the segments are separated from one another and show a representation of the disintegrated output curve.
  • the orientation parameter k runs alternately either from -1 to +1 or from +1 to -1 within each of the movement segments 22.
  • the orientation parameter in the movement segment 22A runs from the lower to the upper edge from -1 to +1, while in the adjacent movement segment 22B it runs from +1 to -1 from the lower to the upper edge. As in Fig. 8 shown this alternating course continues along the entire curve display.
  • the facets of a planar motif area can be clearly described for a given size of the facets.
  • a corresponding reflective surface area 20 can then be produced in a manner known per se, for example, by embossing the facets described in this way in an embossing lacquer layer and then metallizing.
  • this angular range together with the angular spread of the movement range, defines a line width under which the initial curve and the disintegrating segments appear.
  • the k values for a desired motif can be specified using suitable mathematical algorithms; the k value can, for example, increase proportionally to the distance between the segments and the starting curve. Alternatively, the values can also be generated manually by a designer, for example as a color gradient in a design sheet.
  • the value of the orientation parameter preferably increases proportionally to the distance of a segment from the starting curve to the edge of the movement area to +1 or decreases to -1, as in the exemplary embodiment in FIG Fig. 8 shown.
  • the relationship between the orientation parameter and the distance to the starting curve can of course also be non-linear.
  • the line thickness or the dynamics of movement can be varied depending on the tilt angle.
  • the k values can vary very widely around the k value of the output curve, so that a sharp representation of the output curve is achieved. To the edge The k value can then vary more slowly towards the movement segments, which increases the line width and increases the dynamics.
  • the k value does not run through the entire range between -1 and +1 in all segments. If the k value in a segment only runs up to a k value of +0.5, for example, the segment appears to disappear when tilted into viewing angles that correspond to k values above 0.5, since then none are optically effective Elements are present that direct incident light towards the viewer at these viewing angles.
  • microrelief structures with channel-shaped and / or rib-shaped structural elements can also be used as optically effective elements, as they are for example in the publication WO 2014/117938 A1 are described, the disclosure content of which is included in the present application.
  • the orientation parameter k can be linked to the azimuth angle of the structural elements, for example.
  • micro-lens or micro-concave mirror grids can also be used as optically effective elements which, together with line patterns, produce moiré magnification effects.
  • the line patterns have approximately the same period as the microlens or micro-concave mirror rasters and are arranged approximately in the focal plane of the microlenses or micro-concave mirror.
  • the microlenses or micro concave mirrors direct incident light in a direction depending on the viewing angle onto or next to the lines, so that they appear to a viewer either in the color of the lines or in the color of the spaces.
  • the orientation parameter k indicates how far the line pattern is locally shifted with respect to the grid of the microlenses or micro-concave mirrors.
  • the center point of the lines of the grid can be on a first edge of the individual microlenses or micro-concave mirrors and with a k value of +1 on a second edge of the microlenses or micro-concave mirrors opposite the first edge .
  • the described movement effects can be generated not only when viewed from above, but also for viewing when viewed through. If, for example, the facets are not embedded in a material with the same or very similar refractive index, they act like small prisms when viewed through, so that differences in brightness result in the transmitted light and a movement effect according to the invention can be generated in transmitted light.
  • a thin, semitransparent coating for example a thin metal layer
  • the same embossed structures as reflective facets produce a movement effect according to the invention in plan view and at the same time with the effect of microprisms additionally a movement effect according to the invention in transparency.
  • the above-mentioned microrelief structures and hologram grids can also be coated, for example, semitransparently, for example with a very thin metal layer, or with a highly refractive, transparent coating for viewing in transparency.
  • the metallization is advantageously carried out with a thin metal film or a color-changing 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 are visible from different viewing directions as output curves with connected line segments.
  • the security element in the exemplary embodiment has a metallic appearance in which the numerical value “50” is visible multiple times one above the other from a first viewing direction and the letter sequence “PL” from a second viewing direction.
  • Figures 9 (a) to (i) illustrate the visual appearance of a section of a flat motif area 50, which shows as a motif on the one hand the disintegrating numerical value "50" and on the other hand the disintegrating letter sequence "PL", more precisely at different tilt angles.
  • Figure 10 shows the values of the orientation parameter k for this exemplary embodiment in a gray level representation 60.
  • the representation of the value number “50” contains the curve representations 14A, 14B already described in detail above in the form of the digits “5” and “0”, respectively.
  • the representation of the letter sequence “PL” contains the curve representations 54A, 54B in the form of the letters “P” and “L”, respectively. Since the output curves in this embodiment cannot be seen from the same, but from different viewing directions should, the output curves are assigned to different values of the orientation parameter k . Specifically, the output curves for the number “50” correspond to a k value of +0.5 and the output curves for the lettering “PL” correspond to a k value of -0.5.
  • movement segments 22 of the segments 18 of the value number "50” contain only k values between 0 and 1
  • movement segments 52 of the segments 58 of the letter sequence "PL" only contain k values between -1 and 0, as in FIG Fig. 10 illustrated.
  • the segments 18 of the value number "50" are only visible when tilted downwards, since the associated movement segments 22 do not contain any k values greater than 0.
  • the segments 58 of the letter sequence “PL” are only visible when tilted upwards, since the associated movement segments 52 do not contain any k values less than 0.
  • initially disordered segments 58 result in the letter sequence "PL”, which disintegrates again when tilting further, while other disordered segments 22 result in the value number "50”, which in turn disintegrates when tilting further upwards ( Figures 9 (a) to (i) ). When tilting back, the movement is reversed.
  • the movement segments 22, 52 and the segments 18, 58 of the two partial representations are particularly advantageously coordinated with one another in such a way that individual segments run continuously from motion segments of the first representation into motion 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 from the first viewing directions and part of the second representation from the second viewing directions. In this way, the visual impression can be generated that segments of the disintegrating first representation are reassembled to form the new second representation.

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

Claims (16)

  1. Élément de sécurité optiquement variable (12), destiné à sécuriser des objets de valeur, qui en fonction d'un angle d'observation montre un motif pourvu d'au moins une représentation en courbe (14A, 14B), qui à partir d'une première direction d'observation est visible en tant que courbe de départ dotée de deux segments (18) cohérents non colinéaires ou plus, et qui lors d'un basculement de l'élément de sécurité (12) autour d'un axe prédéfini se décompose dans les segments (18) individuels, en ce que les segments (18) de la courbe de départ s'éloignent alternativement dans différentes directions à partir de la courbe de départ, comprenant
    - une zone de motif (20) plane, pourvue d'une multiplicité d'éléments optiquement actifs (30, 32, 34, 36), qui dirigent la lumière incidente chaque fois dans une direction préférentielle,
    - aux segments (18) de la courbe de départ dans la zone de motif (20) plane étant associé chaque fois un segment de mouvement (22) sous la forme d'une zone partielle de la zone de motif (20) plane, dans lequel les éléments optiquement actifs (30, 32, 34, 36) sont placés et orientés de telle sorte qu'ils montrent à partir de la première direction d'observation la courbe de départ dotée des segments (18) cohérents, et qu'à partir des directions d'observation basculées autour de l'axe prédéfini, ils montrent des représentations en courbes dans lesquelles les segments (18) se situent alternativement dans différentes directions et avec un angle de basculement croissant de plus en plus loin de la courbe de départ.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que lors du basculement de l'élément de sécurité, au moins une représentation en courbe se décompose en trois segments ou plus, de préférence en quatre segments ou plus.
  3. Élément de sécurité selon la revendication 1 ou 2, caractérisé en ce que la courbe de départ d'au moins une représentation en courbe montre un caractère alphanumérique, un symbole ou un autre caractère porteur d'informations.
  4. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce que les segments de mouvemente des représentations en courbe ont une largeur qui se situe entre 10 % et 100 %, de préférence entre 20 % et 50 % de l'extension de la courbe de départ de la représentation en courbe.
  5. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que les segments de mouvemente d'au moins une représentation en courbe présentent tous la même épaisseur.
  6. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que les éléments optiquement actifs sont formés de facettes à effet optique de rayonnement, dont l'orientation est caractérisée chaque fois par un angle d'inclinaison α contre le plan de la zone de motif plane et par un angle azimutal θ dans le plan de la zone de motif plane, ou en ce que les éléments optiquement actifs sont formés de champs grillagés à effet optique de diffraction avec un schéma en grille, composé de lignes parallèles de traits de grilles, ou en ce que les éléments optiquement actifs sont formés d'éléments structurels en forme de gorges et/ ou de nervures, disposés côte à côte et s'étendant le long d'une direction longitudinale.
  7. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que la zone de motif est conçue en version réfléchissante, de telle sorte que la courbe de départ et la décomposition de la courbe de départ en des segments individuels soit visible en réflexion.
  8. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que les éléments optiquement actifs sont formés d'éléments réfléchissants qui sont moulés dans un vernis de gaufrage et munis d'un revêtement augmentant la réflexion.
  9. Élément de sécurité selon la revendication 8, caractérisé en ce que le revêtement augmentant la réflexion fait preuve d'un effet de changement de couleur, en ce que le revêtement est un système stratifié d'interférence à film mince doté d'un réflecteur, d'une couche d'écartement diélectrique et d'un absorbeur.
  10. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce que la zone de motif plane est au moins partiellement transmettrice, de sorte que la courbe de départ et la décomposition de la courbe de départ en segments individuels soit visible en transmission.
  11. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce que les éléments optiquement actifs sont formés d'éléments de transmission sous la forme de structures de diffraction transparentes ou semi-transparentes, de structures prismatiques transparentes ou semi-transparentes ou de structures en microreliefs transparentes ou semi-transparentes.
  12. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 11, caractérisé en ce que le motif contient au moins une deuxième représentation en courbe, qui à partir d'une deuxième direction d'observation est visible sous la forme d'une deuxième courbe de départ dotée de deux segments cohérents non colinéaires ou plus, et qui lors du basculement de l'élément de sécurité autour de l'axe prédéfini se décompose dans les segments individuels, en ce que les segments de la deuxième courbe de départ s'éloignent alternativement dans différentes directions à partir de la deuxième courbe de départ, aux segments de la deuxième courbe de départ dans la zone de motif plane étant chaque fois associé un deuxième segment de mouvement sous la forme d'une zone partielle de la zone de motif plane, dans laquelle les éléments optiquement actifs sont disposés et orientés de sorte à montrer à partir de la deuxième direction d'observation la deuxième courbe de départ dotée des segments cohérents, et de sorte à montrer à partir de directions d'observation basculées autour de l'axe prédéterminé des représentations en courbe dans lesquelles les segments se situent alternativement dans différentes directions et avec un angle de basculement croissant de plus en plus loin de la deuxième courbe de départ, notamment de sorte que les segments de mouvemente de la première et de la deuxième représentation en courbe ne se chevauchent pas.
  13. Élément de sécurité selon la revendication 12, caractérisé en ce que la première et la deuxième directions d'observation incluent un angle d'au moins 5°, de préférence d'au moins 10° et de manière particulièrement préférentielle, d'au moins 20°, et/ou en ce qu'au moins un segment de la première représentation en courbe est également un segment de la deuxième représentation en courbe, de sorte que lors du basculement de l'élément de sécurité, la deuxième représentation en courbe se compose au moins partiellement de segments de la première représentation en courbe décomposée.
  14. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 13, caractérisé en ce que l'élément de sécurité est un fil de sécurité, un fil d'arrachage, une bande de sécurité, un ruban de sécurité, un patch ou une étiquette à appliquer sur un papier de sécurité, un document de valeur ou similaires.
  15. Support de données, pourvu d'un élément de sécurité selon l'une quelconque des revendications 1 à 14.
  16. Procédé, destiné à fabriquer un élément de sécurité (12) optiquement variable selon l'une quelconque des revendications 1 à 14, lors duquel
    - on détermine une courbe de départ souhaitée pourvue de deux segments (18) cohérents, non colinéaires ou plus,
    - pour les segments (18) de la courbe de départ, on détermine chaque fois des segments de mouvemente (22) dans lesquels les segments (18) de la courbe de départ bougent lors du basculement de l'élément de sécurité (12), et
    - dans une zone de motif (20) plane dans les segments de mouvement (22) déterminés, on dispose et on oriente des éléments optiquement actifs (30, 32, 34, 36) de sorte qu'à partir de la première direction d'observation, ils montrent la courbe de départ dotée des segments (18) cohérents, et de sorte qu'à partir de directions d'observation basculées autour de l'axe prédéfini, ils montrent des représentations en courbe dans lesquelles les segments (18) se situent alternativement dans différentes directions et avec un angle de basculement croissant de plus en plus loin de la courbe de départ.
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

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

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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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Publication number Publication date
WO2016177470A1 (fr) 2016-11-10
US10081213B2 (en) 2018-09-25
AU2016256954A1 (en) 2017-12-21
EP3291997A1 (fr) 2018-03-14
US20180117949A1 (en) 2018-05-03
DE102015005911A1 (de) 2016-11-10
AU2016256954B2 (en) 2020-11-26
CN107848320A (zh) 2018-03-27
CN107848320B (zh) 2019-11-19

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