EP2040934A2 - Élément de sécurité - Google Patents

Élément de sécurité

Info

Publication number
EP2040934A2
EP2040934A2 EP07785815A EP07785815A EP2040934A2 EP 2040934 A2 EP2040934 A2 EP 2040934A2 EP 07785815 A EP07785815 A EP 07785815A EP 07785815 A EP07785815 A EP 07785815A EP 2040934 A2 EP2040934 A2 EP 2040934A2
Authority
EP
European Patent Office
Prior art keywords
security element
elements
element according
security
subregions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07785815A
Other languages
German (de)
English (en)
Other versions
EP2040934B2 (fr
EP2040934B1 (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 GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38713427&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2040934(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2040934A2 publication Critical patent/EP2040934A2/fr
Application granted granted Critical
Publication of EP2040934B1 publication Critical patent/EP2040934B1/fr
Publication of EP2040934B2 publication Critical patent/EP2040934B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/342—Moiré effects
    • 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
    • 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 moire 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.
  • Security elements for the purpose of security, which make it possible to check the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • the security elements can be embodied, for example, in the form of a security thread embedded in a banknote, a covering 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 manufacture.
  • Security elements with optically variable elements which give the viewer a different image impression under different viewing angles, play a special role, since they can not be reproduced even with high-quality color copying machines.
  • the security elements can be equipped with security features in the form of diffraction-optically effective microstructures or nanostructures, such as with conventional embossed holograms or other hologram-like diffraction structures, as described, for example, in the publications EP 0 330 733 A1 or EP 0064 067 A1. It is also known to use lens systems as security features.
  • EP 0 238 043 A2 describes a security thread made of a transparent material, on the surface of which a grid of several parallel cylindrical lenses is embossed.
  • the thickness of the security thread is chosen so that it corresponds approximately to the focal length of the cylindrical lenses.
  • the print image is designed taking into account the optical properties of the cylindrical lenses. Due to the focusing effect of the cylindrical lenses and the position of the printed image in the focal plane different subregions of the printed image are visible depending on the viewing angle. By appropriate design of the printed image so that information can be introduced, which are visible only at certain angles.
  • a certain embodiment of the printed image also makes it possible to produce "moving" images, the motif moves only approximately continuously from one location on the security thread to another location when the document is rotated about an axis parallel to the cylindrical lenses.
  • US Pat. No. 5,712,731 A discloses the use of a moire magnification arrangement as a security feature.
  • the security device described therein has a regular array of substantially identical printed microimages of up to 250 ⁇ m in size and a regular two-dimensional array of substantially identical spherical microlenses.
  • the microlens array has substantially the same pitch as the microimage array. If the micro-image arrangement is viewed by the microlens array, then in the areas in which the two arrangements are substantially in register, one or more enlarged versions of the microimages are generated for the viewer.
  • the principal operation of such moiré magnification arrangements is described in the article "The Moire Magnifier", MC Hutley, R. Hunt, RF Stevens and P. Savander, Pure Appl.
  • moiré magnification hereinafter refers to a phenomenon that occurs when a grid of identical image objects is viewed through a lenticular grid of approximately the same pitch, and the resulting moiré pattern represents an enlargement and rotation of the image objects of the image raster.
  • the object of the invention is to avoid the disadvantages of the prior art and, in particular, to specify a security element with a micro-optical moire magnification arrangement of high counterfeit security.
  • a generic security element includes a micro-optical moiré magnification arrangement a motif image which consists of a planar periodic or at least locally periodic arrangement of a plurality of micromotivements, and
  • the motif image contains two or more subregions with micromotif elements differing from one another in their contrast, wherein the shape of the subregions forms 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 to integrate an additional macroscopically recognizable image information and thus a higher-level security feature in the security element by a controlled individual variation of the contrast of the micromotif elements.
  • this macroscopic image information can be produced without additional work steps, such as the demetallization of metallic cover layers, and thus particularly economically.
  • macroscopically recognizable image information is taken to mean image information that can be recognized without visual aid by the naked eye.
  • the partial areas themselves each have dimensions of 0.1 mm or more.
  • the outlines of the partial regions form the macroscopic image information
  • the partial regions respectively represent regions 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 must be recognizable to the naked eye, in order to form macroscopic image information.
  • the micromotif elements of the subareas can each have the same shape, or at least partially different shapes. Preferably, only a few different forms are used.
  • the shape of the micromotif elements can also change slowly over the surface of the security element and, for example, continuously change from a first shape to a second shape.
  • the contrast differences of the micromotif elements are advantageously produced by a variation of the line width and / or the stitch depth and / or the color of the micromotif elements.
  • the number of occurring contrast gradations of the micromotif elements is basically arbitrary. However, in many cases, macroscopic image information is more easily recognizable with a small number of contrast gradations.
  • the micromotif elements in the subregions are therefore preferably in two, three, four or five contrast graduations.
  • the contrast transitions between adjacent subareas may be discontinuous, so that the contrast changes abruptly from one subarea to the next.
  • the contrast transitions can also be continuous, for example to produce a slowly changing contrast to generate history.
  • Continuous contrast transitions include, in particular, quasi-continuous contrast transitions with small differences in contrast between adjacent subregions, which are not or hardly discernible to the naked eye.
  • the contrast of the micromotif elements is very low in at least one subarea. In extreme cases, the contrast of the micromotif elements may even disappear.
  • the lateral dimensions of the micromotif elements and of the microfocusing elements are preferably below about 100 ⁇ m, preferably between about 5 ⁇ m and about 50 ⁇ m, particularly preferably between about 10 ⁇ m and about 35 ⁇ m.
  • the micromotif elements in the partial areas are each arranged in the form of a grid, wherein the grid arrangements differ in different partial areas in at least one raster parameter, in particular in the raster width, the raster orientation or the lattice symmetry of the raster.
  • the microfocusing element arrangement is preferably likewise subdivided into subareas in which the arrangement of the microfocusing elements is respectively matched to the raster arrangement of the associated subarea of the micromotif elements.
  • the macroscopic image information can be seen in a transparent manner.
  • the arrangement of micromotif elements and the arrangement of microfocusing elements advantageously 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 may 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 hybrid of these lens types. Preferably, they are formed by non-cylindrical microlenses, in particular by microlenses having a circular or polygonal limited base surface.
  • the arrangement of microfocusing elements can moreover be provided with a protective layer whose refractive index 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 able to be easily molded.
  • microfocusing elements are produced, for example, from lacquers having a refractive index of 1.2 to 1.5
  • lacquers filled with nanoparticles of titanium oxide for example, which are commercially available with refractive indices between 1.7 and 2, are suitable as protective layers.
  • the micromotif elements are preferably in the form of micro-characters or micro-patterns.
  • the micromotif elements may be present in a printing layer. It is understood that the micromotif elements for Generation of moire magnification effect must be largely identical. However, a slow, in particular periodically modulated change in the appearance of the micromotif elements and thus also of the enlarged images is likewise within the scope of the invention. Also, individual or a part of the micromotif elements can be equipped with additional information that does not appear in the enlarged moiré image, but which can be used as an additional authenticity indicator.
  • 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, document of value or the like.
  • the security element can span a transparent or recessed area of a data medium, for example 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 with a micro-optical moiré magnification arrangement, in which a motif image consisting 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 arrangement of a Plurality of microfocusing elements are arranged so that the micromotif elements, as viewed through the microfocus
  • the motif image with two or more subregions having mutually differing micromotif elements is designed in such a way that the shape of the subregions forms a macroscopic image information in the form of characters, patterns or codes that can be recognized by the contrast differences of the micromotif elements ,
  • a security paper according to the invention for the production of security documents or valuable documents, such as banknotes, checks, identity cards, originals or the like, is provided with a security element of the type described above.
  • the security paper may in particular comprise a carrier substrate made of paper or plastic.
  • the invention also includes a data carrier, in particular a brand article, a value document or the like, with a security element of the type described above.
  • the security element can be arranged in particular in a window area, ie a transparent or recessed area of the data carrier.
  • 1 shows a schematic representation of a banknote with an embedded security thread and a see-through security element arranged above a see-through area
  • 2 schematically the layer structure of a security element according to the invention in cross-section
  • FIG. 3 shows in (a) the motif image of a security element according to the invention in a plan view, in (b) the appearance of the security element when viewed in a plan view and in (c) the appearance of the security element when viewed in phantom,
  • FIG. 5 shows an inventive see-through security element according to a further exemplary embodiment of the invention, wherein (a) is a schematic plan view of the motif image of the see-through security element, (b) the visual impression when viewing the motif image in a plan view and (c) the visual impression when viewed in FIG Review shows, and
  • Fig. 6 shows the visual impression when viewing a security element according to a further embodiment of the invention in plan view.
  • Fig. 1 shows a schematic representation of a banknote 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 at certain window areas 14 on the surface of the banknote 10, while it is embedded in the intervening areas in the interior of the banknote 10.
  • the second security element is designed in the form of a see-through security element 16, which is arranged above a see-through region 18, for example a window region or a through-opening of the banknote 10.
  • Both the security thread 12 and the see-through security element 16 may include a moire magnification arrangement with additional macroscopic image information according to an embodiment of the invention.
  • Fig. 2 shows schematically the layer structure of a security element according to the invention 20 in cross section, wherein only the parts of the layer structure required for the explanation of the functional principle are shown.
  • the security element 20 includes an optical spacer layer 22, the upper side of which is provided with a regular array of microlenses 24.
  • the arrangement of the microlenses 24 in each case partially forms a grid with preselected screen parameters, such as screen ruling, grid orientation and grid symmetry.
  • the lattice symmetry can be described by a two-dimensional Bravais lattice, the hexagonal symmetry being assumed for the following explanation for the sake of simplicity, even if the Bravais lattice according to the invention can have a lower symmetry and thus a more general shape.
  • a motif layer 26 which contains a likewise grid-shaped arrangement of similar micro-motive elements 28.
  • the arrangement of the micromotif elements 28 can also be described by a two-dimensional Bravais lattice with a preselected symmetry, again assuming a hexagonal lattice symmetry for illustration.
  • the Bravais grid of the micromotif elements 28 differs slightly in its symmetry and / or in the size of the grid parameters from the Bravais grid of the microlenses 24 to the desired one Moire magnification effect to produce.
  • the distance of adjacent microlenses 24 is preferably chosen as small as possible in order to ensure the highest possible area coverage and thus a high-contrast representation.
  • the spherically or aspherically configured microlenses 24 have a diameter of between 5 ⁇ m and 50 ⁇ m, preferably only between 10 ⁇ m and 35 ⁇ m, and are therefore invisible to the naked eye.
  • the grating period and the diameter of the micromotif elements 28 are in the same order of magnitude as that of the microlenses 24, ie in the range from 5 ⁇ m to 50 ⁇ m, preferably from 10 ⁇ m to 35 ⁇ m, so that even the micromotif elements 28 themselves are not visible to the naked eye can be seen.
  • the optical thickness of the spacer layer 22 and the focal length of the microlenses 24 are matched to one another such that the micromotif elements 28 are approximately at the distance of the lens focal length. Due to the slightly differing lattice parameters, when the security element 20 is viewed from above through the microlenses 24, the observer sees a slightly different subregion of the micromotif elements 28, respectively. such that the plurality of microlenses produces an overall enlarged image of the micromotif elements 28.
  • the resulting moire magnification depends on the relative difference of the lattice parameters of the Bravais lattice used. If, for example, the grating periods of two hexagonal grids differ by 1%, the result is a 100-fold moire magnification.
  • the motif image is now formed according to the invention with two or more subregions, each of which contains micro-motive elements differing in their contrast and the shape of which is a macroscopic image information in the form of characters, patterns or objects recognizable by the contrast differences of the micromotif elements Codings forms.
  • FIG. 3 (a) shows a schematic plan view of the motif image 30 of a see-through security element according to an exemplary embodiment of the invention, 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 of identical shape but locally different in contrast.
  • the different contrast arises in the exemplary embodiment in that the micromotif elements 36 are formed in a first subregion 32 of the motif image 30 with a low line width, while the micromotif elements 38 of a second subregion 34 are formed with a large line thickness.
  • the outline of the subregions 32, 34 forms a macroscopic image information, in the exemplary embodiment the letter "A".
  • the dimensions of the macroscopic image information "A" are typically in the range of a few millimeters or centimeters and are therefore significantly larger than the micromotif elements 36, 38 whose dimensions are only in the range of a few tens of micrometers.
  • the micromotif elements 36, 38 in FIG. 3 (a) are shown individually only in enlarged detailed cutouts 42, 44 of the partial regions 32, 34.
  • the micromotif elements 36, 38 of the two subareas are formed with identical shape, in the embodiment in the form of a 5-pointed star, but different line thickness.
  • the motif image 30 is viewed through the microlens array 24, as shown in the illumination situation of FIG. 3 (b), locally differently contrasting enlarged images 46 and 48 result. Assuming a 100 times moire magnification of the See-through security element, the dimensions of the images 46, 48 then 100 times larger than the dimensions of the micromotif elements 36, 38th
  • the viewer perceives the moiré magnification effect with enlarged images 46, 48 of the micromotif elements 36, 38, which is associated with the motion effects known from moiré magnification arrangements when tilting the security element.
  • the motif image 30 and the microlens array 24 may be designed for the occurrence of an ortho-parallactic motion effect in which the magnified images 46, 48 are perpendicular to the direction of tilt rather than parallel to the tipping direction, as you would intuitively expect.
  • the images 46, 48 may seem to float in front of or behind the image plane of the security element.
  • the second optical effect is formed by the macroscopic variation of the contrast of the moire magnified images 46, 48 in the subregions 32 and 34, respectively.
  • This optical effect leads to the representation of a macroscopic image information which is stationary relative to the plane of the security element and which in the exemplary embodiment is formed by the outline of the letter "A" which can clearly be seen in FIG. 3 (b).
  • the stitch depth and / or the color of the micromotif elements in the subregions can also be varied in order to obtain a different contrast effect.
  • continuous contrast transitions can also be realized, for example by a continuous increase or decrease in the line width of the micromotif elements.
  • the number of different contrast gradations in a motif image is basically arbitrary. A limited number of contrast gradations, however, in many applications leads to an easier recognizability of the macroscopic information, so that currently designs with two to five contrast graduations are preferred.
  • the rasters in which the respective micromotif elements are arranged can additionally be designed differently, as illustrated with reference to FIG. 4.
  • FIGS. 4 (a) and 4 (b) show again the micromotif elements 36 and 38 in the cutouts 42 and 44 of FIG. 3 (a), which are both arranged in a grid with hexagonal lattice symmetry.
  • the micromotif elements 38 of the partial area 34 can then be arranged, for example, in a hexagonal grid of greater screen width, as shown in FIG. 4 (c), in a hexagonal grid of the same Raster width but different orientation, as shown in Fig. 4 (d), or in a raster with other, for example, square lattice symmetry, as shown in Fig. 4 (e).
  • more than one screen parameter can be varied at the same time.
  • the grid arrangement of the associated microlenses 24 is suitably matched to the grid arrangement of the micromotif elements 36, 38 in the respective subregions.
  • the stationary contrast variation described above can be extended by a further optical effect, namely by a variation of the primary moiré magnification effect in the different subregions 32, 34.
  • the partial area 34 representing the interior of the letter "A" in FIG. 3 may have a different moiré magnification than the partial area 32, so that the motif elements appear there not only with different contrast but also with a different magnification.
  • the motion effects in the subregions 32, 34 may differ from one another, such that the magnified images 46, 48 move in different directions during tilting of the security element in the subregions 32, 34.
  • FIG. 5 shows a schematic plan view of the motif image 50 of the see-through security element
  • FIG. 5 (b) shows the visual impression when viewing the motif image 50 in plan view
  • FIG Fig. 5 (c) illustrates the visual impression when viewed in phantom.
  • the motif image 50 contains a plurality of micromotif elements 62, 64, 66 with 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 designed with a very low line width, while the micromotif elements 64 and 66 are formed in the subregion 54 or 56 with medium or large line thickness.
  • 5 are not contiguous in the exemplary embodiment of FIG. 5 and are therefore filled with narrow hatching for illustration (partial area 56), filled with wide hatching (partial area 54) or not hatched (partial area 52).
  • the subregions 52, 54, 56 each represent regions of the same brightness level in a halftone image, such as a portrait. Often, this is already sufficient three levels of brightness, corresponding to the tonal values of white, gray and black, to produce a halftone image that is clearly visible to the human eye.
  • the dimensions of the halftone image are in the macroscopic range, that is, the motif image 50 represents image information that can be recognized with the naked eye. Accordingly, the micromotif elements 62, 64, 66, which are substantially smaller with, for example, about 30 ⁇ m, are as in FIG. 3 (a). , shown only in enlarged sections of the sections 52, 54, 56.
  • a security element 80 contains a motif image with micromotif elements which, in addition to different contrasts, also have different shapes.
  • a first subarea 82 contains micromotif elements of a first shape (star) and with a low line width.
  • a second portion 84 contains micromotif elements of the same shape (star) with a large line width.
  • a third subregion 86 contains micromotif elements of a second shape (symbol) with a low line width, while a fourth subregion 88 contains micromotif elements of the second shape (symbol) with a large line width.
  • the first and second partial regions 82, 84 and the third and fourth partial regions 86, 88 form macroscopic image information with their outlines, in the exemplary embodiment the letter sequence "PL".

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

Abstract

L'invention concerne un élément de sécurité destiné à des papiers de sécurité, des documents de sécurité et similaires, comportant un dispositif d'agrandissement à moiré micro-optique, présentant une image à motifs (30) composée d'une disposition planaire périodique ou au moins localement périodique, d'une pluralité d'éléments à micro-motifs (36,38), et d'une disposition planaire périodique ou au moins localement périodique d'une pluralité d'éléments à micro-focalisation, pour l'observation agrandie à moiré des éléments de micro-motifs (36, 38) de l'image à motifs. L'image à motifs (30) comporte au moins deux zones partielles (32, 34) présentant des éléments à micro-motifs (36, 38) se différenciant par leur contraste, la forme des zones partielles (32, 34) formant une information d'image macroscopique se présentant sous la forme de symboles, de motifs ou de codages, reconnaissable au moyen des différences de contraste des éléments à micro-motifs (36, 38).
EP07785815.7A 2006-06-27 2007-06-13 Élément de sécurité Active EP2040934B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029850A DE102006029850A1 (de) 2006-06-27 2006-06-27 Sicherheitselement
PCT/EP2007/005201 WO2008000351A2 (fr) 2006-06-27 2007-06-13 Élément de sécurité

Publications (3)

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

Family

ID=38713427

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Publication number Publication date
EP2040934B2 (fr) 2020-01-01
WO2008000351A3 (fr) 2008-02-07
US20090322071A1 (en) 2009-12-31
WO2008000351A2 (fr) 2008-01-03
DE102006029850A1 (de) 2008-01-03
EP2040934B1 (fr) 2016-08-31
US8740095B2 (en) 2014-06-03

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