EP2951031B1 - Élément de sécurité pourvu d'éléments structuraux en forme de rainure ou de nervure - Google Patents

Élément de sécurité pourvu d'éléments structuraux en forme de rainure ou de nervure Download PDF

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Publication number
EP2951031B1
EP2951031B1 EP14702449.1A EP14702449A EP2951031B1 EP 2951031 B1 EP2951031 B1 EP 2951031B1 EP 14702449 A EP14702449 A EP 14702449A EP 2951031 B1 EP2951031 B1 EP 2951031B1
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EP
European Patent Office
Prior art keywords
security element
structural elements
element according
longitudinal direction
regions
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
EP14702449.1A
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German (de)
English (en)
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EP2951031A1 (fr
Inventor
Christian Fuhse
Hans Lochbihler
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 GmbH
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Publication of EP2951031A1 publication Critical patent/EP2951031A1/fr
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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
    • 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
    • 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
    • B42D25/40—Manufacture
    • B42D2035/34—
    • B42D2035/50—

Definitions

  • the invention relates to a security element for the production of value documents, such as banknotes, checks or the like, having an upper surface on which a microrelief structure is formed, which has at least two partial regions, each of which has a plurality of trough-shaped or rib-shaped, adjacent and longitudinal a longitudinally extending, reflecting or backscattering structural elements, wherein the longitudinal directions of the subregions are different.
  • the invention further relates to a document of value with such a security element.
  • the invention also relates to a manufacturing method for a security element for documents of value, such as banknotes, checks or the like, wherein a substrate is provided which has a top side on which a microrelief structure having at least two partial regions, each having a multiplicity, is formed Having channel-shaped or rib-shaped, juxtaposed and extending along a longitudinal direction, reflective or backscattering structural elements, wherein the longitudinal directions of the subregions are different.
  • optically variable surface patterns can produce running effects or three-dimensional representations.
  • the effects are achieved by means of diffraction gratings (eg in the form of holograms), micromirrors or a combination of microlenses and microimages.
  • the WO 2012/069163 A1 discloses a security element consisting of retroreflectors provided with a color-changeable coating. Through an interaction of single and multiple reflections in the retroreflectors with the angle-dependent color of the coating (especially thin-film coating with angle-dependent "Colorshift") special color effects are generated.
  • channel structures are disclosed as retroreflectors, which realize pumping and running effects.
  • the pumping or running effects mentioned relate to mobile color changes. It is further mentioned that with such gutter structures by varying the gutter direction also three-dimensional appearing representations can be realized.
  • the WO 2011/079347 A1 discloses how to create three-dimensional effects with gutter or rib-like structures.
  • the structures of the contour of the contour can follow a curved surface or with the structures different views of an object for the left and right eye of an observer can be provided.
  • the WO 2012/048847 A1 discloses a security element that provides representations composed of points or lines that seem to float in front of or behind the plane of the security element. These points or lines are referred to as light spots and are given by focus points and lines of hollow or cambered mirrors. To achieve this effect, a viewer must see the light spots of a lens structure with both eyes. In a cylindrical lens structure, the corresponding focal lines are perceived at different locations with both eyes. The height or depth at which the light spot floats in front of or behind the plane of the security element depends on the focal length. The necessary structures are relatively expensive to manufacture.
  • a security element which has at least one security feature whose surface has a macrostructure in a reflection layer and is subdivided into at least a first and a second subarea.
  • the first partial surface has a first structure.
  • An achromatic second structure is molded into the second subarea.
  • the optically active structures deflect the incident light within a predetermined angular range about the direction of the specular reflection and contain visually visible but not photocopiable information.
  • the invention has for its object to provide a security element of the type mentioned above, which provides a difficult reproducible or imitable effect and thereby is easier to manufacture, especially as regards the structures to be produced.
  • the object is further achieved with a manufacturing method of the type mentioned, in which the structural elements are not resolvable with respect to the width transverse to the longitudinal direction with the naked eye and are designed so that they fan out incident parallel light achromatically in a fan across the Lying longitudinally and has an opening angle of at least 30 °.
  • the invention achieves that in the WO 2012/069163 A1 mentioned run effects and three-dimensional appearances to achieve even with microrelief structures that have no color coating, since the reflection is achromatic. A grayscale effect is achieved.
  • the effects are not based on a partially different color effect, for which the said WO-writing combined retroreflectors and a special thin film coating, but show partially different brightness in reflection.
  • the structural elements are preferably not designed as retroreflectors. This is easier to manufacture because shallower structures can be used. Furthermore, one achieves the advantage that these effects can be realized on both sides, thus also on the back of a correspondingly designed foil, which is not possible with retroreflectors, which can only retroreflect to one side.
  • the invention thus employs an optically variable areal pattern based on optically effective relief features which fan out incident parallel light about a predetermined axis defined by the longitudinal axis of the features. If optically effective structural elements are arranged in the different subregions, which fan the light around different axes, these subregions appear to a viewer depending on the viewing angle (in each case based on the light source) light or dark. If you turn such a security element in its plane defined by the surface, you can see how individual areas alternately become light or dark. The brightness of the individual regions depends on the case of perpendicularly incident light, whether the longitudinal direction is transverse to an observation plane or not. The observation plane is defined by the perpendicular to the surface of the security element, the viewing direction and the illumination direction. In a non-perpendicular light incidence direction, fanning generally need not be in a plane, but may be in a curved surface.
  • the fanning out of the incident light is effected by the achromatic, beam-optically acting microrelief structure.
  • This is advantageous over the use of diffraction gratings (eg holograms), since the efficiency of such microrelief structures is significantly better.
  • diffraction gratings eg holograms
  • a well-defined scattering angle range of almost constant brightness distribution can be achieved with a microrelief structure according to the invention.
  • the light distribution in the fan is largely homogeneous and in the direction of the specular reflection of the surface of the security element not significantly more radiation is reflected than in the rest of the fan.
  • the structural elements are formed so that vertically incident light is fanned out symmetrically about the surface normal.
  • the fanning takes place with advantage substantially uniformly, ie within the opening angle of the fan results in a substantially uniform distribution of the reflected or backscattered light.
  • a substantially uniform distribution of the reflected or backscattered light is here understood in particular that within the opening angle of the fan, the observed brightness of the reflected or backscattered light varies by no more than a factor of 3, preferably not more than a factor of 2, especially preferably not more than a factor of 0.5.
  • each groove-shaped structural element is therefore smooth according to the invention, so that a similarly high reflected brightness is observed from a wide viewing angle range as long as observation and illumination are in the plane of the fan.
  • the structural elements according to the invention have, viewed transversely to the longitudinal direction, a profile which has no discontinuity.
  • a strong effect is further conducive if the structural elements reflect or backscatter the incident parallel light along the longitudinal direction so that it is fanned out by no more than 10 °, preferably not more than 5 °. A greater diversification in this direction would allow the structural elements to scatter almost isotropically again and make them appear increasingly dull so that the rotation of the longitudinal direction relative to the viewing plane ultimately does not produce any good kinematic effects, etc.
  • the security element creates a pattern against a backdrop.
  • the rotation in the image plane causes a contrast inversion, as the pattern and its background differ in terms of their longitudinal direction of the structural elements, wherein ideally the longitudinal directions are perpendicular to each other.
  • the pattern and its background form two parts. In a first orientation, the pattern appears bright and the background dark. If you rotate the security element in the image plane, ie you rotate the viewing plane with respect to the longitudinal direction, swap bright and dark.
  • the different orientations of longitudinal directions are not limited to two directions or even perpendicular position to each other.
  • By a continuous variation of the orientation of the longitudinal directions and pumping or running effects can be realized.
  • Such motion effects especially attract the attention of a viewer and are therefore advantageously advantageous as easily recognizable features for authenticating a security element.
  • a height information of the object to be reproduced or a distance to the object to be displayed can be coded by the orientation of the longitudinal direction of the individual structural elements. In this case, a viewer perceives laterally different parallax in the plane surface provided with the microrelief structure.
  • the structure depth is on the order of half the structure width. Since one would not want to exceed a maximum thickness of the security element in many applications, widths of the channel or rib-shaped structural elements smaller than 30 microns are preferred in order to keep the thickness of the security element as low as possible. A lower limit for the width is about 2 ⁇ m, due to the diffraction behavior of the light on structures in orders of magnitude of the wavelength. Because for smaller widths, the scattering or the diffraction component of the reflected light increase. For very small structural elements, for example, at widths less than 10 microns, therefore, irregular or aperiodic structures can be used advantageously to avoid, for example, diffraction-related color effects. Furthermore, the width of the channel and / or rib-shaped structural elements is selected such that a single one of the channel and / or rib-shaped structural elements can no longer be resolved by the viewer.
  • the extent of the trough-shaped or rib-shaped structural elements in the longitudinal direction is preferably at least 5 times greater, preferably at least 6 times greater, particularly preferably 10 times or even greater than the extent or width in the transverse direction perpendicular to the longitudinal direction.
  • the structural elements can be formed in their profile in many different variants. In particular, it is advantageous if they are convex from the top.
  • profiles which contain an arc of a circle, an ellipse or a parabola.
  • a particularly easy-to-manufacture variant, which shows a good optical effect, are structural elements, which are formed by grooves or ribs whose surface corresponds to a part of a lateral surface of a circular cylinder.
  • the structural elements in such a way that their pitch relative to the plane which passes through the Surface is spanned so small that it includes an angle of not more than 45 °, preferably not more than 30 °.
  • the structural elements at least partially have a reflective or reflection-enhancing coating, in particular a metallization, a high-index coating, a thin-film element with color shift effect, a coating with liquid crystals and / or a coating with a metallic acting or reflective ink ,
  • the different subareas can be nested within each other, so that a viewer from different viewing directions result in different representations. In this way, a kinematic effect can be generated by a stereogram or, with appropriate movement of the security element.
  • the formation of the security element on a transparent carrier film makes it possible to use the security element from both sides with the effect generated by the security element.
  • a bright reflex wanders, for example, continuously from the first area to the last area 72, whereby at the end, of course, the starting situation is present again.
  • the effect does not jump and is easy to observe when rotating from all directions.
  • a different number of regions and / or also a different angle differentiation of the longitudinal directions than the aforementioned 5 ° can be used.
  • the regions can also be arranged in other shapes, for example on a circle.
  • the security elements it is also possible to generate representations which, when the security element rotates, apparently move at a different rotational speed.
  • representations which, when the security element rotates, apparently move at a different rotational speed.
  • 36 different regions could be interleaved, which are visible from different directions of rotation at 5 ° and in each case show practically identical representations, but which are twisted against each other.
  • a viewer upon rotation of the security element, a viewer sees a representation that appears to be rotating differently than the security element itself (or, for example, a banknote bearing the security element).
  • the representations may in particular be designed so that the impression arises that the representation would not rotate like a compass needle. Alternatively, the impression of a much faster movement can arise.
  • embodiments are feasible in which sections appear to rotate at different speeds, such as different sized gears in a transmission.
  • the production can be analogous to the known manufacturing method for microlenses respectively.
  • the original of the microrelief structure is written via direct exposure with the aid of a laserwriter into a photoresist-coated substrate and then the exposed portion of the photoresist is removed. An exposed original can then be galvanically formed and thus an embossing stamp can be created.
  • the structure is replicated via a stamping process, for example in UV varnish on film.
  • a nanoimprint method can be used. This photolithographic manufacturing process offers many design options in the choice of the geometry of the microrelief structure.
  • a vapor deposition of the surface to increase the reflection for example a metal coating, is preferably carried out.
  • electron beam vapor deposition, sputtering or thermal evaporation under vacuum are possible.
  • the structure for protection is preferably laminated with a cover layer.
  • the manufacturing method according to the invention can be designed so that the described preferred embodiments and embodiments of the security element are produced.
  • the security element may in particular be designed as a security thread, tear-open thread, security strip, security strip, patch or label.
  • the security element can span transparent areas or recesses.
  • the security element can be part of a precursor that can not yet be processed to a value document which, in addition to the security element according to the invention, can also have further authenticity features (such as, for example, luminescent substances provided in the volume).
  • value documents are here understood on the one hand as having the security element having documents.
  • value documents can also be other documents and objects which can be provided with the security element according to the invention, so that the value documents have non-copyable authenticity features, whereby a verification of authenticity is possible and unwanted copies are prevented at the same time.
  • Chip or security cards such. Bank or credit cards are other examples of a value document.
  • FIG. 1 schematically shows a sectional view through a security element 1, which has a reflective microrelief structure 2, which is formed in a substrate.
  • this substrate On its upper side, this substrate has a plurality of structural elements, which are formed in the case shown as ribs, which extend perpendicular to the plane of the drawing and on its surface transverse to this longitudinal direction have the profile of a circular arc.
  • the individual structural elements 3 thus have a section of a circular cylinder jacket surface.
  • other profiles are possible, for example elliptical or parabolic forms as the basis of the profile. Reference is made in this regard to the above, general part of the description.
  • Parallel incident light 4 is reflected at each structural element 3 of the microrelief structure 2 into a fan 5.
  • reflected light beams 6a, 6b and 6c are shown.
  • the angular range of the fan 5 is at least 30 °, preferably not less than 45 ° and particularly preferably (as in the case shown) at least 90 °.
  • the fanning is not more than 10 °, more preferably less than 5 °.
  • FIG. 2 shows a scanning electron micrograph of an exemplary microrelief structure 2. It should be noted that with the in FIG. 2a the sample was installed so that the representation of the FIG. 2a from below looking at the microrelief structure 2. FIG. 2b schematically reproduces the scanning electron micrograph. FIG. 2 shows the following optional features of the security element or the microrelief structure 2:
  • the structural elements 3 vary with regard to their longitudinal direction. In the exemplary case of FIG. 2 There are two different longitudinal directions, which are rotated 90 ° against each other. Other angular positions are possible.
  • the width of the individual structural elements 3 transversely to the longitudinal direction is not resolvable with the unaided eye. Like the registered scaling in the FIG. 2 shows, it is in the embodiment of a few micrometers and thus below a feature size of 100 microns, which would be visible to the naked eye.
  • the individual structural elements 3 may differ both in terms of the width measured transversely to the longitudinal extent and in terms of their length measured along the longitudinal direction.
  • the length may also be such that a single structural element is no longer visible to the naked eye. However, this is not mandatory, as the sometimes longer running through structural elements 3 in FIG. 2 illustrate.
  • FIG. 5 shows two subregions 8 and 9, which differ with respect to the longitudinal direction 10,11 of their structural elements 3.
  • the respective longitudinal direction is symbolized by the direction of the hatching in the subregions 8 and 9.
  • the longitudinal directions 10 and 11 are at right angles to each other. With the double arrows, the direction of the fan 5 is illustrated, in the parallel incident light 4 is reflected.
  • the presentation of the FIG. 5 is based on normal incidence of light on the surface of the security element 1.
  • the fan 5 tilts at oblique incidence so that it lies symmetrically relative to the light incident direction with respect to the surface normal of the security element.
  • the fan 5 need not lie in a plane here, but may also be in a curved surface.
  • the effect of the invention can of course not only with the structure according to FIG. 1 or other rib-shaped, ie convex structural elements 3 can be achieved, but also with channel-shaped, ie concave structural elements.
  • One such example is in FIG. 3 shown. Here exactly the same effect occurs.
  • FIG. 4 illustrates that concave structural elements 3a combined with convex structural elements 3b, can be alternated in the embodiment.
  • FIG. 4 This is exemplified by structural elements 3, which follow in profile a curved section of a circle 7.
  • the microrelief structure 2 of FIG. 1 thus has an overall wave-like structure.
  • the profile depth is selected in the microrelief structures 2 such that preferably no multiple reflection takes place, since this would lead to a sudden, uneven distribution of the brightness in the compartments 5.
  • FIG. 6 illustrates a variant in which the subregions 8, 9 of the FIG. 5 designed in the form of a motif, which is exemplified as a star.
  • the motifs 12a, 12b and 12c differ by the longitudinal directions 13a-13c of their structural elements 3.
  • the viewer sees a running effect when he turns the security element.
  • the subject 12a is light, then the subject 12b and then the subject 12c.
  • the brightness differs by the orientation of the longitudinal directions 13a to 13c.
  • the security element effects a stereoscopic effect.
  • Two partial areas, here the motifs 12a and 12c, are spaced so that the viewer's left eye is at the appropriate viewing distance in the fan of the subject 12a, the right eye in the fan of the subject 12c (the motif 12b is then omitted).
  • the observer therefore sees the motif in different positions in his left and right eyes, which makes him appear in front of or behind the plane of the security element, depending on the rotational position.
  • the depth at which the observer assumes the presented motive depends on the distance of the motives 12a and 12c.
  • the viewer sees the totality of all structural elements of the motif 12a together in the same brightness. The same applies to motif 12b.
  • FIG. 7 shows a further embodiment of the security element 1, in which the microrelief structure causes a running effect.
  • the motifs 12a to 12c of FIG. 6 are now formed so that they are at a distance P, which is smaller than the extent of the subject. They are interlaced, sometimes overlapping. In the overlapping region, structural elements 3 of one motif alternate with structural elements 3 of the other motif. In the presentation of the FIG. 7 this is illustrated schematically by an intersection of the longitudinal directions. Of course, at a given surface area, only one structural element 3 may be present either with the longitudinal direction of the one motif or the longitudinal direction of the other motif. Therefore, structural elements of different shape alternate in small areas within the overlap area.
  • the areas can also show different motifs, eg. B. the Form of an icon (eg € sign) and the form of a value number.
  • the areas can also have very complex shapes and, for example, provide a halftoned halftone image.
  • the regions can pass virtually continuously from a first shape to a second shape, which also allows a transformation effect to be realized.
  • FIG. 9 shows a plan view of a microrelief structure 2, which includes subregions 15.1 to 15.10, in which the longitudinal direction differs by 10 ° between adjacent portion. The boundary lines between the subregions are entered only for clarity in the drawing.
  • the security element can preferably be manufactured on the basis of a transparent carrier film. It offers an optically variable effect of comparable quality from both sides. For example, viewed from the front, the structure of FIG. 1 and seen from the back the structure of the FIG. 3 in front. This makes the security element special preferably suitable for window areas of value documents or for security threads, pendulum threads etc. in banknotes.
  • the structures can be convex or concave without the optical effect differing significantly. It is also conceivable to use alternately upwards or downwards curved (convex or concave) structures, for example with a circular cross-section. Sinusoidal or similar profiles are possible.
  • the structures are preferably designed such that no multiple reflections of the (perpendicular) incident light can occur, which cause abrupt changes in the reflected brightness.
  • Relief structures are thus advantageous whose pitch is so small that they include only an angle of at most 45 °, preferably at most 30 °, locally with the macroscopic plane of the security element.
  • the structures may be regular or periodic or even irregular (eg arrangement of scattering structures with circular cross-sections having irregularly varying radii).
  • feature sizes eg periods with a regular arrangement
  • feature sizes of more than 3 ⁇ m, preferably more than 5 ⁇ m and particularly preferably more than 10 ⁇ m, are used.
  • the structures depicted in the figures with their cross-sections advantageously run into the plane of the drawing with virtually unchanged cross-section.
  • the expansion in this direction is advantageously at least 5 .mu.m, particularly advantageously at least 10 .mu.m or 20 .mu.m in size, since diffraction-related or scattering at the edges also causes a fuzziness here in a second direction.
  • the structural elements cause a reflection of the incident light.
  • They are preferably embossed on a carrier film, for example by applying to the carrier film an embossing lacquer which can be, for example, thermoplastic or radiation-curing.
  • the structural elements according to the invention can also be combined with other embossed structures, in particular micromirror structures, and in particular interlaced.
  • structure elements according to the invention which produce a running effect can be nested with micromirror structures, such that a micromirror representation, for example, of a movement effect visible from a large viewing angle range, is then produced only in a very small angular range.

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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)
  • Printing Methods (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Claims (17)

  1. Elément de sécurité pour la fabrication de documents de valeur, comme les billets de banque, les chèques ou documents analogues, comportant une face supérieure sur laquelle est formé une structure en microrelief (2), qui a au moins deux zones séparées (8, 9), lesquelles comportent respectivement une pluralité d'éléments structurels (3) réfléchissants ou rétrodiffusants en forme de rainures et/ou de nervures, situés les uns à côté des autres et s'étendant le long d'une direction longitudinale (10, 11), les directions longitudinales (10, 11) des zones séparées (8, 9) étant différentes,
    les éléments structurels (3) n'étant pas respectivement résolubles à l'oeil nu eu égard à la largeur transversalement à la direction longitudinale (10, 11) et étalant achromatiquement la lumière (4)incidente parallèle dans un éventail (5) qui se situe transversalement à la direction longitudinale (10, 11) et possède un angle d'ouverture d'au moins 30°.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que l'éventail a un angle d'ouverture d'au moins 45°, de préférence au moins 90°.
  3. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les éléments structurels réfléchissent ou rétrodiffusent la lumière incidente parallèle le long de la direction longitudinale de telle manière qu'elle est étalée en éventail de pas plus de 10°.
  4. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments structurels possèdent respectivement vus transversalement à la direction longitudinale, un profil qui ne comporte aucune discontinuité.
  5. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments structurels sont convexes vus du côté supérieur.
  6. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que la largeur des éléments structurels se situe respectivement entre 3 µm et 50 µm, de préférence entre 5 et 30 µm.
  7. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que le profil a une section qui est un arc d'un cercle, une parabole ou une ellipse.
  8. Elément de sécurité selon la revendication 7, caractérisé en ce que les éléments structurels sont formés par des rainures ou des nervures dont la surface correspond à une partie d'une surface d'enveloppe d'un cylindre circulaire.
  9. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments structurels ont un angle d'inclinaison d'un maximum de 45°, de préférence au maximum de 30° par rapport à un plan défini par le côté supérieur.
  10. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments structurels sont dotés au moins par zone d'un revêtement réfléchissant ou à haut pouvoir de réflexion, notamment d'un revêtement métallisé, d'un revêtement à haute résistance à la rupture, d'un élément à couche mince avec effet de basculement de couleur, d'un revêtement avec cristaux liquides ou d'un revêtement avec une couleur d'impression à effet métallique ou réfléchissante.
  11. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins les deux zones séparées sont, soit emboîtées l'une dans l'autre, de sorte qu'il en résulte des représentations différentes pour un observateur à partir de directions d'observation différentes, soit qu'elles sont éloignées de telle sorte qu'elles représentent un stéréogramme.
  12. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il y a au moins cinq zones séparées présentes dont les directions longitudinales sont différentes de telle manière qu'un effet cinématique, notamment un effet de passage ou de pompage, se présente à un observateur lors de la rotation de l'élément de sécurité autour d'un axe se situant perpendiculairement à la surface supérieure.
  13. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il y a une pluralité de zones séparées, dont les directions longitudinales se différencient, les directions longitudinales d'une ligne de contour en hauteur suivant une surface courbée pour présenter un effet tridimensionnel à un observateur.
  14. Elément de sécurité selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte une feuille de support transparente dans laquelle la structure en microrelief est constituée, l'élément de sécurité permettant une perception bilatérale de l'effet produit par l'élément de sécurité.
  15. Document de valeur avec un élément de sécurité selon l'une quelconque des revendications précédentes.
  16. Procédé pour la fabrication d'un élément de sécurité pour des documents de valeur, comme les billets de banque, les chèques ou documents analogues, un substrat étant préparé qui comporte un côté supérieur, une structure en microrelief (2) étant constituée sur le côté supérieur, qui possède au moins deux zones séparées (8, 9), lesquelles comportent respectivement une pluralité d'éléments structurels (3) réfléchissants ou rétrodiffusants en forme de rainures et/ou de nervures, situés les uns à côté des autres et s'étendant le long d'une direction longitudinale (10, 11), les directions longitudinales (10, 11) des zones séparées (8, 9) étant différentes, les éléments structurels (3) n'étant pas respectivement résolubles à l'oeil nu eu égard à la largeur transversalement à la direction longitudinale (10, 11) et étant constituées de telle manière qu'ils étalent achromatiquement la lumière (4) incidente parallèle dans un éventail (5) qui se situe transversalement à la direction longitudinale (10, 11) et possède un angle d'ouverture d'au moins 30°.
  17. Procédé selon la revendication 16, caractérisé en ce qu'un élément de sécurité est fabriqué selon l'une quelconque des revendications 2 à 14.
EP14702449.1A 2013-01-31 2014-01-29 Élément de sécurité pourvu d'éléments structuraux en forme de rainure ou de nervure Active EP2951031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013001734.3A DE102013001734A1 (de) 2013-01-31 2013-01-31 Sicherheitselement mit rinnen- oder rippenförmigen Strukturelementen
PCT/EP2014/000245 WO2014117938A1 (fr) 2013-01-31 2014-01-29 Élément de sécurité pourvu d'éléments structuraux en forme de rainure ou de nervure

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EP2951031A1 EP2951031A1 (fr) 2015-12-09
EP2951031B1 true EP2951031B1 (fr) 2017-03-15

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US (1) US10005309B2 (fr)
EP (1) EP2951031B1 (fr)
CN (1) CN104955658B (fr)
DE (1) DE102013001734A1 (fr)
RU (1) RU2635776C2 (fr)
WO (1) WO2014117938A1 (fr)

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Publication number Publication date
DE102013001734A1 (de) 2014-07-31
WO2014117938A1 (fr) 2014-08-07
US20150352884A1 (en) 2015-12-10
EP2951031A1 (fr) 2015-12-09
CN104955658A (zh) 2015-09-30
US10005309B2 (en) 2018-06-26
CN104955658B (zh) 2017-07-25
RU2635776C2 (ru) 2017-11-15
RU2015136649A (ru) 2017-03-10

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