EP2040934B2 - Élément de sécurité - Google Patents

Élément de sécurité Download PDF

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Publication number
EP2040934B2
EP2040934B2 EP07785815.7A EP07785815A EP2040934B2 EP 2040934 B2 EP2040934 B2 EP 2040934B2 EP 07785815 A EP07785815 A EP 07785815A EP 2040934 B2 EP2040934 B2 EP 2040934B2
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EP
European Patent Office
Prior art keywords
elements
arrangement
security element
micromotif elements
security
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
EP07785815.7A
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German (de)
English (en)
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EP2040934B1 (fr
EP2040934A2 (fr
Inventor
Marius Dichtl
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
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Filing date
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Publication of EP2040934B1 publication Critical patent/EP2040934B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • 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
    • B42D25/29—Securities; Bank notes
    • B42D2033/24—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the invention relates to a security element for security papers, documents of value and the like and in particular relates to such a security element with a micro-optical moiré magnification arrangement.
  • the invention further relates to a method for producing such a security element, a security paper and a data carrier with such a security element.
  • Data carriers such as documents of value or identity documents, but also other valuable objects, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction.
  • the security elements can be designed, for example, in the form of a security thread embedded in a banknote, a cover film for a banknote with a hole, an applied security strip or a self-supporting transfer element which is applied to a value document after its production.
  • the security device described there has a regular arrangement of essentially identical printed microimages with a size of up to 250 ⁇ m and a regular two-dimensional arrangement of essentially identical spherical microlenses.
  • the microlens arrangement has essentially the same division as the microimage arrangement. If the micro-image arrangement is viewed through the microlens arrangement, one or more enlarged versions of the micro-images are generated for the viewer in the areas in which the two arrangements are essentially in register.
  • the image object grids are produced using classic printing techniques or else using embossing techniques with various further processing steps.
  • embossing techniques are now generally available on the market, so that such moiré enlargement arrangements can be copied relatively easily by counterfeiters.
  • the object of the invention is to avoid the disadvantages of the prior art and, in particular, to provide a security element with a micro-optical moiré magnification arrangement with a high level of security against forgery.
  • the motif image contains two or more subareas with their contrasting micromotif elements, the shape of the subareas forming macroscopic image information recognizable by the contrast differences of the micromotif elements in the form of characters, patterns or codes.
  • the invention is based on the idea of integrating additional macroscopically recognizable image information and thus a security feature of a higher level into the security element through a controlled individual variation of the contrast of the micromotif elements.
  • this macroscopic image information can be generated without additional work steps, such as the demetallization of metallic cover layers, and is therefore particularly economical.
  • macroscopically recognizable image information is understood to mean image information recognizable with the naked eye without optical aids.
  • the partial areas themselves each have dimensions of 0.1 mm or more.
  • the outlines of the partial areas form the macroscopic image information
  • the partial areas each represent areas of the same brightness level in a halftone image. In the latter case, it is not the partial areas themselves, but only the halftone image formed by them that can be seen with the naked eye in order to form macroscopic image information.
  • micromotif elements of the partial areas each have the same shape.
  • the contrast differences of the micromotif elements are generated by varying the line width and / or the line depth and / or the color of the micromotif elements.
  • the number of contrast gradations of the micromotif elements that occur is basically arbitrary. In many cases, however, the macroscopic image information can be recognized more easily with a small number of contrast gradations.
  • the micromotif elements in the partial areas are therefore preferably in two, three, four or five contrast gradations.
  • the contrast transitions between adjacent partial areas can be discontinuous, so that the contrast changes abruptly from one partial area to the next.
  • the contrast transitions can, however, also be continuous, for example in order to produce a slowly changing contrast curve.
  • Continuous contrast transitions include, in particular, quasi-continuous contrast transitions with small contrast differences between adjacent subregions that are invisible or hardly noticeable to the eye.
  • the lateral dimensions of the micromotif elements and the microfocusing elements are preferably below approximately 100 ⁇ m, preferably between approximately 5 ⁇ m and approximately 50 ⁇ m, particularly preferably between approximately 10 ⁇ m and approximately 35 ⁇ m.
  • the micromotif elements are each arranged in the form of a grid in the partial areas, the grid arrangements in different partial areas differing in at least one grid parameter, in particular in the grid width, the grid orientation or the grid symmetry of the grid.
  • the microfocusing element arrangement is preferably also subdivided into subregions in which the arrangement of the microfocusing elements is matched to the grid arrangement of the associated subregion of the micromotif elements.
  • the macroscopic image information can be seen through.
  • the arrangement of micromotif elements and the arrangement of microfocusing elements each form a two-dimensional Bravais grating at least locally, the arrangement of micromotif elements and / or the arrangement of microfocusing elements forming a Bravais grating with the symmetry of a parallelogram grating.
  • the motif image and the arrangement of microfocusing elements are expediently arranged on opposite surfaces of an optical spacer layer.
  • the spacer layer can comprise, for example, a plastic film and / or a lacquer layer.
  • the microfocusing elements of the moiré magnification arrangement can be present as transmissive, refractive or diffractive lenses or as a mixed form of these lens types. They are preferably formed by non-cylindrical microlenses, in particular by microlenses with a circular or polygonally limited base area.
  • the arrangement of microfocusing elements can also be provided with a protective layer, the refractive index of which preferably deviates by at least 0.3 from the refractive index of the microfocusing elements. In addition to protection against environmental influences, such a protective layer also prevents the microfocusing element arrangement from being easily molded. If the microfocusing elements are made of lacquer with a refractive index manufactured from 1.2 to 1.5 are suitable as protective layers, for example lacquers filled with nanoparticles of titanium oxide, which are commercially available with refractive indices between 1.7 and 2.
  • the micro motif elements are preferably in the form of micro characters or micro patterns.
  • the micromotif elements can be present in a print layer. It goes without saying that the micromotif elements for generating the moiré magnification effect have to be largely identical. However, a slow, in particular periodically modulated change in the appearance of the micromotif elements and thus also in the enlarged images is also within the scope of the invention. Individual or a part of the micromotif elements can also be provided with additional information which does not appear in the enlarged moiré image, but which can be used as an additional authenticity indicator.
  • the total thickness of the security element is advantageously below 50 ⁇ m, which ensures that it is well suited for use in security paper, value documents or the like.
  • the security element itself preferably represents a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, security document or the like.
  • the security element can span, for example, a transparent or recessed area of a data carrier a window area of a banknote. Different appearances can be realized on different sides of the data carrier.
  • the invention also includes a method for producing a security element of the type described above with a micro-optical moiré magnification arrangement, in which a motif image, which consists of a planar periodic or at least locally periodic arrangement of a plurality of micromotif elements, and a planar periodic or at least locally periodic An arrangement of a plurality of microfocusing elements can be arranged such that the micromotif elements can be seen enlarged when viewed through the microfocusing elements, the motif image being formed with two or more sub-areas with micromotif elements differing in their contrast, such that the shape of the sub-areas is one due to the contrast differences of the micromotif elements forms recognizable macroscopic image information in the form of characters, patterns or codes.
  • a security paper according to the invention for the production of security or value documents, such as banknotes, checks, identity cards, certificates or the like, is equipped with a security element of the type described above.
  • the security paper can in particular comprise a carrier substrate made of paper or plastic.
  • the invention also includes a data carrier, in particular a branded article, a document of value or the like, with a security element of the type described above.
  • the security element can in particular be arranged in a window area, ie a transparent or recessed area of the data carrier.
  • Fig. 1 shows a schematic representation of a bank note 10 which is provided with two security elements 12 and 16 according to embodiments of the invention.
  • the first security element represents a security thread 12 which emerges from certain window areas 14 on the surface of the bank note 10, while it is embedded in the areas in between inside the bank note 10.
  • the second security element is in the form of a see-through security element 16, which is arranged above a see-through area 18, for example a window area or a continuous opening of the banknote 10.
  • Both the security thread 12 and the see-through security element 16 can contain a moiré magnification arrangement with additional macroscopic image information according to an exemplary embodiment of the invention.
  • Fig. 2 schematically shows the layer structure of a security element 20 according to the invention in cross section, only the parts of the layer structure required for the explanation of the functional principle being shown.
  • the security element 20 contains an optical spacer layer 22, the upper side of which is provided with a regular arrangement of microlenses 24.
  • the arrangement of the microlenses 24 forms a grid with preselected grid parameters, such as grid width, grid orientation and grid symmetry.
  • the lattice symmetry is described by a two-dimensional Bravais lattice, with a hexagonal symmetry being assumed for the sake of simplicity, even if the Bravais lattice according to the invention has a lower symmetry and thus a more general shape.
  • a motif layer 26 is arranged on the underside of the spacer layer 22 and also contains a grid-like arrangement of similar micromotif elements 28.
  • the arrangement of the micromotif elements 28 is also described by a two-dimensional Bravais grating with a preselected symmetry, with a hexagonal grating symmetry again being assumed for illustration.
  • the Bravais lattice of the micromotif elements 28 differs slightly in its symmetry and / or in the size of the lattice parameters from the Bravais lattice of the microlenses 24 in order to produce the desired moiré magnification effect ,
  • the distance between adjacent microlenses 24 is preferably chosen to be as small as possible in order to ensure the greatest possible area coverage and thus a high-contrast display.
  • the spherical or aspherical microlenses 24 have a diameter between 5 microns and 50 microns, preferably only between 10 microns and 35 microns and are therefore not visible to the naked eye.
  • the grating period and the diameter of the micromotif elements 28 are of the same order of magnitude as that of the microlenses 24, that is to say in the range from 5 ⁇ m to 50 ⁇ m, preferably from 10 ⁇ m to 35 ⁇ m, so that the micromotif elements 28 cannot be seen even with the naked eye are.
  • the optical thickness of the spacer layer 22 and the focal length of the microlenses 24 are coordinated with one another in such a way that the micromotif elements 28 are approximately at the distance from the lens focal length. Due to the slightly different grating parameters, the viewer sees a somewhat different sub-area of the micromotif elements 28 when the security element 20 is viewed from above through the microlenses 24, so that the multitude of microlenses as a whole produces an enlarged image of the micromotif elements 28.
  • the resulting moiré magnification depends on the relative difference in the lattice parameters of the Bravais grids used. If, for example, the lattice periods of two hexagonal lattices differ by 1%, the result is a 100-fold moiré magnification.
  • the motif image is now designed according to the invention with two or more partial areas, each of which contains micromotif elements that differ from one another in contrast and whose shape forms macroscopic image information in the form of characters, patterns or codes that can be recognized by the contrast differences of the micromotif elements ,
  • Fig. 3 (a) shows a schematic top view of the motif image 30 of a see-through security element according to an illustrative example, which is connected in the manner explained above via an optical spacer layer 22 to a microlens array 24.
  • the motif image 30 contains a plurality of micromotif elements 36, 38 with an identical shape but a different local contrast.
  • the different contrast in the exemplary embodiment arises from the fact that the micromotif elements 36 are formed in a first partial area 32 of the motif image 30 with a small stroke width, while the micromotif elements 38 of a second partial area 34 are formed with a large stroke width.
  • the micromotif elements 36, 38 of the two subregions are of identical shape, in the example in the form of a 5-pointed star, but of different line thickness.
  • the motif image 30 is viewed through the microlens array 24, as is the case in the incident light situation Fig. 3 (b) is shown, locally differently contrasting enlarged images 46 and 48. Assuming 100 times moiré magnification of the see-through security element, the dimensions of the images 46, 48 are then 100 times larger than the dimensions of the micromotif elements 36, 38.
  • the second optical effect is formed by the macroscopic variation of the contrast of the moiré-enlarged images 46, 48 in the partial areas 32 and 34, respectively.
  • This optical effect leads to the representation of macroscopic image information which is stationary with respect to the level of the security element and which in the example is represented by the in Fig. 3 (b) clearly recognizable outline of the letter "A" is formed.
  • the motif image 30 of the see-through security element is viewed through the micromotif element arrangement, as in FIG Fig. 3 (c) Shown as a transmitted light situation, only the fixed contrast difference of the partial areas 32 and 34 can be seen. A moiré enlargement effect does not occur in this viewing situation, so the viewer has the impression of a dark letter "A" against a light background, as in Fig. 3 (c) shown.
  • the line depth and / or the color of the micromotif elements in the partial areas can also be varied in order to obtain a different contrast effect.
  • continuous contrast transitions can also be achieved, for example by continuously increasing or decreasing the line width of the micromotif elements.
  • the number of different contrast gradations in a subject image is arbitrary.
  • a limited number of contrast gradations leads to easier recognition of the macroscopic information in many applications, so that designs with two to five contrast gradations are currently preferred.
  • the rasters in which the respective micromotif elements are arranged can also be designed differently, as shown in FIG Fig. 4 illustrated.
  • FIGS. 4 (a) and 4 (b) initially show the micromotif elements 36 and 38 in the cutouts 42 and 44 of FIG Fig. 3 (a) , both of which are arranged for the sake of simplicity in a grid with hexagonal lattice symmetry not according to the invention. If the grid arrangement in sub-area 32 remains the same ( Fig. 4 (a) ), the micromotif elements 38 of the partial area 34 can then be arranged, for example, in a hexagonal grid with a larger grid width, as in FIG Fig. 4 (c) shown in a hexagonal grid of the same grid size but different orientation, as in Fig. 4 (d) shown, or in a grid with a different, for example not square inventive grid symmetry, as in Fig. 4 (e) shown. Of course, more than one raster parameter can also be varied at the same time.
  • the grid arrangement of the associated microlenses 24 is expediently matched to the grid arrangement of the micromotif elements 36, 38 in the respective partial areas.
  • the stationary contrast variation described above can be expanded by a further optical effect, namely by a variation of the primary moiré magnification effect in the different partial areas 32, 34.
  • the partial area 34 representing the inside of the letter "A” has a different moiré magnification than the partial area 32, so that the motif elements appear there not only with a different contrast, but also in a different magnification.
  • the movement effects in the partial areas 32, 34 can differ from one another, so that the enlarged images 46, 48 move in different directions when the security element is tilted in the partial areas 32, 34.
  • FIG. 5 Another example of a see-through security element is in Fig. 5 shown, where Fig. 5 (a) 2 shows a schematic top view of the motif image 50 of the see-through security element, Fig. 5 (b) the visual impression when viewing the motif image 50 under supervision and Fig. 5 (c) represents the visual impression when viewed in transparency.
  • the motif image 50 contains a plurality of micromotif elements 62, 64, 66 with an identical shape, in the exemplary embodiment in the form of a 5-pointed star, but locally different line thickness and thus locally different contrast.
  • the micromotif elements 62 are very small Line width is formed, while the micromotif elements 64 and 66 are formed in the subarea 54 and 56 with medium or large line widths.
  • the partial areas each containing micromotif elements of the same line thickness are in the exemplary embodiment of FIG Fig. 5 are not contiguous and are therefore filled with a narrow hatching (partial area 56), a wide hatching (partial area 54) or not hatched (partial area 52) for illustration.
  • the partial areas 52, 54, 56 each represent areas of the same brightness level in a halftone image, such as a portrait.
  • Three brightness levels, corresponding to the tonal values white, gray and black, are often sufficient to produce a halftone image that is easily recognizable for the human eye ,
  • the dimensions of the halftone image lie in the macroscopic range, the motif image 50 thus represents image information that can be seen with the naked eye Fig. 3 (a) , only shown in enlarged sections of the partial areas 52, 54, 56.
  • Fig. 5 (b) When looking at the security element from above, two optical effects occur simultaneously, as in Fig. 5 (b) illustrated.
  • the viewer can see a moiré magnification effect with enlarged images 72, 74, 76 of the micromotif elements and the movement effects already mentioned.
  • the macroscopic variation in the contrast of the moiré-enlarged images 72, 74, 76 in the partial regions 52, 54, 56 also shows a halftone image. This forms a fixed macroscopic image information which, unlike the individual enlarged images 72, 74, 76, does not perform any relative movement when the security element is tilted.
  • a security element 80 contains a motif image with micromotif elements which, in addition to different contrasts, also have different shapes.
  • the image impression shown when the security element is viewed from above contains a first partial area 82 micromotif elements of a first shape (star) and with a small line width.
  • a second partial area 84 contains micromotif elements of the same shape (star) with a large line width.
  • a third section 86 contains micromotif elements of a second shape (symbol) with a small stroke width, while a fourth section 88 contains micromotif elements of the second form (symbol) with a large stroke width.
  • the outlines of the first and second partial areas 82, 84 and the third and fourth partial areas 86, 88 form macroscopic image information, in the exemplary embodiment the letter sequence “PL”.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Claims (16)

  1. Elément de sécurité pour papiers de sécurité, documents de valeur et similaires avec un dispositif d'agrandissement microoptique de type moiré avec
    - une image à motif qui est composée d'un dispositif planaire périodique ou au moins localement périodique d'une pluralité d'éléments à micromotif, et
    - un agencement planaire périodique ou au moins localement périodique d'une pluralité d'éléments de micro-focalisation pour l'observation à agrandissement de moiré des éléments à micromotif de l'image à motif,
    l'image à motif contenant deux parties de zone ou plus avec des éléments à micromotif se différenciant les uns des autres dans leur contraste et la forme des parties de zone formant une information en image macroscopique identifiable par les différences de contraste des éléments à micromotif sous la forme de signes, de motifs ou de codifications et les différences de contraste des éléments à micromotif étant produites par une variation de la largeur de trait et/ou de la profondeur de trait et/ou de la couleur des éléments à micromotif, les éléments à micromotif des parties de zone comportant respectivement la même forme, le dispositif des éléments à micromotif et le dispositif des éléments de micro-focalisation formant au moins localement, respectivement un réseau de Bravais bidimensionnel, caractérisé en ce que l'agencement des éléments à micromotif et/ou l'agencement d'éléments de micro-focalisation forment un réseau de Bravais avec la symétrie d'une grille en parallélogramme.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que les parties de zone ont respectivement des dimensions de 0,1 mm ou plus.
  3. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les contours des parties de zone forment l'information en image macroscopique.
  4. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les parties de zone représentent respectivement des zones de même niveau de luminosité dans une image en demi-teinte.
  5. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que les éléments à micromotif dans les parties de zone existent en deux, trois, quatre ou cinq dégradés de contraste.
  6. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que les transitions de contraste entre les parties de zone voisines sont continues ou discontinues.
  7. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que le contraste des éléments à micromotif est très faible dans au moins une partie de zone.
  8. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que les dimensions latérales des éléments à micromotif et des éléments de micro-focalisation se situent en dessous d'environ 100 µm, de préférence entre 5 µm et environ 50 µm, de façon particulièrement préférée entre environ 10 µm et environ 35 µm.
  9. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 8, caractérisé en ce que les éléments à micromotif dans les parties de zone sont respectivement disposés sous la forme d'une grille et les dispositifs de grille dans les différentes parties de zone se différencient dans au moins un paramètre de grille, en particulier dans la largeur de grille, l'orientation de grille ou la symétrie de grille du réseau et le dispositif d'éléments de micro-focalisation est de préférence subdivisé en parties de zone dans lesquelles le dispositif des éléments de micro-focalisation est respectivement ajusté sur le dispositif de grille de la partie de zone correspondante des éléments à micromotif.
  10. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce que l'information en image macroscopique est identifiable en transparence.
  11. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce que l'image à motif et le dispositif des éléments de micro-focalisation sont disposés sur des surfaces opposées d'une couche de compensation optique.
  12. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 11, caractérisé en ce que les éléments de micro-focalisation sont formés par des microlentilles non cylindriques, en particulier par des microlentilles avec une surface de base de forme circulaire ou limitée de manière polygonale.
  13. Elément de sécurité selon au moins l'une quelconque des revendications 1 à 12, caractérisé en ce que les éléments à micromotif existent sous la forme de microsignes ou micromotifs.
  14. Elément 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 de déchirement, une bande de sécurité, un ruban de sécurité, une pastille ou une étiquette à appliquer sur un papier de sécurité, un document de valeur, un article de marque ou un objet similaire et de préférence dans une zone de fenêtre du papier de sécurité, du document de valeur, de l'article de marque ou de l'objet similaire.
  15. Procédé destiné à réaliser un élément de sécurité avec un dispositif d'agrandissement microoptique de type moiré pour lequel une image à motif, qui est composée d'un dispositif planaire périodique ou au moins localement périodique d'une pluralité d'éléments à micromotif et un dispositif planaire périodique ou au moins localement périodique d'une pluralité d'éléments de micro-focalisation sont disposés de telle manière que les éléments à micromotif sont identifiables en agrandissement par observation à travers les éléments de micro-focalisations, l'image à motif étant constituée de deux parties de zone ou plus avec des éléments à micromotif se différenciant les uns des autres dans leur contraste de telle manière que la forme des parties de zone constitue une information en image macroscopique identifiable par les différences de contraste des éléments à micromotif sous la forme de signes, de motifs ou de codifications, les différences de contraste des éléments à micromotif étant produites par une variation de la largeur de trait et/ou de la profondeur de trait et/ou de la couleur des éléments à micromotif, les éléments à micromotif des parties de zone comportant respectivement la même forme, le dispositif des éléments à micromotif et le dispositif des éléments de micro-focalisation formant au moins localement, respectivement un réseau de Bravais bidimensionnel, caractérisé en ce que l'agencement des éléments à micromotif et/ ou l'agencement d'éléments de micro-focalisation forment un réseau de Bravais avec la symétrie d'une grille en parallélogramme.
  16. Papier de sécurité pour la fabrication de documents de sécurité ou de valeur, comme les billets de banque, les chèques, les cartes d'identité, les documents ou éléments similaires, qui est doté d'un élément de sécurité selon au moins l'une des revendications 1 à 14 et de préférence un substrat de support en papier ou matière plastique.
EP07785815.7A 2006-06-27 2007-06-13 Élément de sécurité Active EP2040934B2 (fr)

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DE102006029850A DE102006029850A1 (de) 2006-06-27 2006-06-27 Sicherheitselement
PCT/EP2007/005201 WO2008000351A2 (fr) 2006-06-27 2007-06-13 Élément de sécurité

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EP2040934A2 EP2040934A2 (fr) 2009-04-01
EP2040934B1 EP2040934B1 (fr) 2016-08-31
EP2040934B2 true EP2040934B2 (fr) 2020-01-01

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US20090322071A1 (en) 2009-12-31
WO2008000351A3 (fr) 2008-02-07
US8740095B2 (en) 2014-06-03
EP2040934B1 (fr) 2016-08-31
WO2008000351A2 (fr) 2008-01-03
EP2040934A2 (fr) 2009-04-01
DE102006029850A1 (de) 2008-01-03

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