EP2385902A1 - Élément de sécurité et papier de sécurité - Google Patents

Élément de sécurité et papier de sécurité

Info

Publication number
EP2385902A1
EP2385902A1 EP09799257A EP09799257A EP2385902A1 EP 2385902 A1 EP2385902 A1 EP 2385902A1 EP 09799257 A EP09799257 A EP 09799257A EP 09799257 A EP09799257 A EP 09799257A EP 2385902 A1 EP2385902 A1 EP 2385902A1
Authority
EP
European Patent Office
Prior art keywords
security
motif
security feature
area
feature
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
EP09799257A
Other languages
German (de)
English (en)
Other versions
EP2385902B1 (fr
Inventor
Michael Rahm
André Gregarek
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 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
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2385902A1 publication Critical patent/EP2385902A1/fr
Application granted granted Critical
Publication of EP2385902B1 publication Critical patent/EP2385902B1/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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • 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
    • B42D2035/12—
    • B42D2035/20—
    • B42D2035/36—
    • B42D2035/44—
    • B42D2035/50—
    • 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

Definitions

  • the invention relates to a security element for security or value documents and a security paper with a see-through security element which is arranged in or above a window area or a through opening of the security paper.
  • Security or value documents such as banknotes, identity cards and the like, are often equipped with security elements for security, which allow verification of the authenticity of the documents and at the same time serve as protection against unauthorized reproduction.
  • the security elements may be in the form of, for example, a security thread embedded in a banknote, a product packaging tearing thread, an applied security strip, a cover sheet for a banknote having a through opening or a self-supporting transfer element, such as a patch or label its production is applied to a document of value.
  • a security thread embedded in a banknote a product packaging tearing thread
  • an applied security strip a cover sheet for a banknote having a through opening or a self-supporting transfer element, such as a patch or label its production is applied to a document of value.
  • Increasingly transparent security features, such as transparent windows in banknotes are becoming increasingly attractive.
  • a film provided with an adhesive layer on one side is applied to a banknote in order to close a previously produced through opening of the banknote.
  • Security elements with optically variable elements which give the viewer a different image impression at different viewing angles, play a special role, since they can not be reproduced even with high-quality color copying machines.
  • the safety elements can be equipped with safety features in the form of diffraction can be equipped table effective micro- or nanostructures, such as with conventional embossed holograms or other hologram-like diffraction structures, as described for example in the publications EP 0330 733 Al or EP 0064 067 Al.
  • 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, as well as a regular two-dimensional array of substantially identical spherical microlenses.
  • the microlens arrangement has substantially the same pitch as the microimage arrangement. 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.
  • Moir ⁇ magnification refers to a phenomenon that occurs when viewing a grid of identical image objects through a lenticular grid of approximately the same pitch: As with any pair of similar rasters, this results in a moire pattern, in this case an enlarged and possibly rotated image the repeated elements of the image grid appears.
  • the object of the invention is to avoid the disadvantages of the prior art and, in particular, to avoid a safety specify element or a security paper of the type mentioned with high security against counterfeiting.
  • the see-through security element has a first security feature, which is formed by a micro-optical representation arrangement for representing at least one first motif,
  • the micro-optical representation arrangement includes a motif image which is divided into a plurality of cells, in each of which imaged areas of the first motif are arranged, as well as a viewing grid of a plurality of viewing elements, the first motif from the in the Reconstructed cells arranged imaged areas,
  • the security paper has a second security feature with at least a second motif, which is in a sense context with the first motif.
  • the invention is based on the idea of providing a second security feature in addition to a first security feature in the form of a microoptical representation arrangement for representing a first motif, which represents a second motif standing in a context of meaning to the first motif.
  • Such a context of meaning may consist in particular in that the second security feature represents the same motif as the first security feature, wherein the spatial position and / or the size of the two motifs may differ.
  • the context of meaning according to the invention can also consist in that the first and second motives respectively represent only parts of the motive that complement one another in an overall motif or that the first and second motive complement each other to form a conclusive overall picture.
  • the difference between the two latter possibilities lies in the fact that the motifs in the first case are recognizable as incomplete parts of an overall motif, while in the latter case the two motifs each represent independent motifs, which, however, fit together in terms of content and together result in a consistent overall picture.
  • the first and second motif may be spatially matched to one another in order to produce a context of meaning, in particular in arrangement, shape and / or size.
  • a sense context of the motives of the two security features leads to an increased protection against counterfeiting of the security paper or the security element, since the production of the content-related security features represents a larger technological hurdle than that separate or contentwise unlinked production of two security features.
  • the safety features used in the security area are usually already individually associated with a high outlay for the procurement of the necessary equipment for the production of the security feature and the necessary know-how.
  • the manufacturer must not only have the technologies to make the features used, but must also be able to provide those features in a required manner in terms of arrangement, color, shape and / or size or in general in the visual appearance in order to create the desired meaning context.
  • a micro-optical representation arrangement for representing a given motif is combined with a continuous opening which is to have the same shape and size as the given motif, the manufacturer must not only punch or cut suitable holes and produce micro-optical display arrangements, but rather the micro-optical In addition, the representation arrangement must be generated with the correct magnification in order to achieve the desired congruence of reconstructed motif and opening.
  • a further advantage of the configurations according to the invention is that a contextual linking of the various security features results in greater user attention and easier recognizability of adjustments: the lack of one of the security features or a quality inferior due to counterfeiting is much easier if the of the security features presented in a meaningful context. In this way, the attention of to increase the technological requirements of the potential counterfeiter.
  • the micro-optical representation arrangement of the first security feature can be embodied in particular as a moire magnification arrangement, as a moiré-type micro-optical magnification arrangement or as a modulo magnification arrangement.
  • the functional principle and the properties of these micro-optical representational arrangements are described in detail in German patent applications DE 102005 062 132.5, DE 10 2007029 203.3 and DE 102007029 204.1, as well as in international applications PCT / EP2006 / 012374, PCT / EP2008 / 005171 and PCT / EP2008 / 005172 described, the disclosure of which are included in the present application in this respect.
  • the regions of the first motif imaged in the cells of the motif image of the microoptical representation arrangement are also sometimes referred to as micromotif elements in accordance with the terminology used in the aforementioned applications.
  • viewing elements refractive microlenses and micromirrors are preferred, but other viewing elements mentioned in the publications cited above can also be used.
  • the information formed by the first and second motif is in particular an alphanumeric string, such as a serial number or a denomination of a banknote, a logo, an encoding or a graphic motif, which in particular represents objects of any kind, plants, animals or humans.
  • the first subject can also be a sequence of images, showing, for example, a short story or the transformation of a subject into another subject (morphing).
  • the second security feature is formed by the window area or the continuous opening of the security paper and the second motif by the outline shape of the window area or the continuous opening.
  • the window area or the through opening can advantageously have a sharply delimited edge at least in a partial area, as can be generated for example by punching or laser cutting.
  • the window region or the through opening advantageously has, at least in one subarea, an edge produced during papermaking with characteristic irregularities.
  • Especially attractive and tamper-proof variants use window areas or continuous openings with a combination of sharp and characteristically irregular edges.
  • a combination can be produced, for example, by producing a continuous opening with characteristic irregularities in the edge region during papermaking and by modifying the edge region of the opening thus produced after papermaking by cutting or punching and thereby sharply limited in desired partial areas.
  • Further possibilities for combining sharp and characteristically irregular edge regions are described in the publication WO 2006/119896 A2, the disclosure of which is incorporated in the present application in this respect.
  • a see-through security element with the first security feature which is formed by a micro-optical representation arrangement for representing the at least first motif, generates
  • a window area or a continuous opening is produced as a second security feature, and the second motif, which is meaningful with the first motif, is formed by the outline shape of the window area or the through opening, and
  • the see-through security element is arranged in or over the window area or the through opening.
  • the second security feature is present in the see-through security element.
  • the second security feature can advantageously represent a diffractive optical element that generates a traceable projection image with the second motif from a passing beam of substantially parallel light in transmission.
  • Diffractive optical elements are typically diffractive structures embossed in transparent substrates, which are designed for monochromatic coherent laser radiation of a predetermined wavelength. If they are irradiated with a laser of suitable wavelength, registered images can be displayed on a projection screen.
  • the diffractive optical element used as a second security feature is preferably formed from a plurality of diffractive unit cells, which have a lateral dimension of about 1 mm, preferably also below 1 mm.
  • the projection image of the diffractive optical element is preferably only visible under special lighting and viewing conditions with the naked eye and without aids, and a good representation of the projection image without colored edges is only achieved by irradiation with a suitable light source, such as a laser pointer. The projection image can then be captured on a screen.
  • the second security feature may advantageously be a refractive optical element that generates the second motif from a passing beam of substantially parallel light or from light from a remote point light source.
  • the refractive optical element used as a second security feature is preferably formed from a plurality of achromatic microstructure elements which have a lateral dimension below 1 mm, preferably between 3 ⁇ m and 100 ⁇ m.
  • the different achromatic microstructure elements are combined into superordinate units whose lateral dimension is preferably about 1 mm or less and which are arranged periodically in at least one spatial direction or at least locally periodically.
  • at least a part of the microstructure elements is formed by microprisms, which are each characterized by the dimension of their base, a refractive angle and an orientation of the microprism indicating azimuth angle.
  • at least a part of the microstructure elements has a curved surface.
  • These achromatic microstructure elements may be formed, for example, by microcones or micro-step cones, each through the diameter of its base and a ⁇ ffhungswinkel are characterized.
  • the microstructure elements in each case have a lateral dimension above about 3 ⁇ m, preferably above about 5 ⁇ m, particularly preferred above about 10 um on. Further information on the possible configurations and properties of such refractive optical elements can be found in the publication WO 2007/137744 A2 and the application PCT / EP2008 / 002841, the disclosures of which are incorporated in the present application in this respect.
  • the window area or the through opening of the security paper can advantageously have a third security feature with one through the outline shape of the window area or the continuous opening formed third motif, which is in a sense context with the first and second motif.
  • the third security feature may represent the same motif as the first and / or second security feature.
  • a see-through security element with the first security feature which is formed by a micro-optical representation arrangement for representing the at least first motif, and with the second security feature with the second motif, which stands in a meaningful relationship with the first motif,
  • the see-through security element is arranged in or over the window area or the through opening.
  • the security element has a first security feature which is formed by a micro-optical representation arrangement for representing at least one first motif
  • the micro-optical representation arrangement contains a motif image, which is divided into a plurality of cells, in each of which arranged areas of the first motif are arranged, as well as a viewing grid of a plurality of viewing elements, which reconstructs the first motif from the imaged areas arranged in the cells when viewing the motif image,
  • the security element has a second security feature with at least one second motif, which is in a meaning context with the first motif
  • the second security feature is formed by a static image area arranged within the first security feature and the second motif by the outline shape of the static image area, wherein no viewing elements are provided in the static image area or the optical effect of the viewing elements is neutralized and / or none imaged areas of the first motif are provided.
  • a security element is generated with the first and second security feature, wherein the first security feature is formed by a micro-optical representation arrangement for representing the at least first motif, and the second security feature forms the second motif, which is in a meaning context with the first motif,
  • the second security feature by a disposed within the first security feature static image area and the second motif is formed by the outline of the static image area, wherein no viewing elements are provided in the static image area or the visual effect of the viewing elements is neutralized and / or no imaged areas of the first motif are provided.
  • the security element has a first security feature which is formed by a micro-optical representation arrangement for representing at least one first motif
  • the micro-optical representation arrangement contains a motif image, which is divided into a plurality of cells, in each of which imaged areas of the first motif are arranged, as well as a viewing grid of a plurality of viewing elements, the first motif when viewing the motif image of the reconstructed in the cells arranged imaged areas,
  • the security element has a second security feature with at least one second motif, which is in a meaning context with the first motif
  • the second security feature is formed by an area with an optically variable layer system and the second motif by the outline of this area.
  • a security element is generated with the first and second security feature, wherein the first security feature is formed by a micro-optical representation arrangement for representing the at least first motif, and the second security feature forms the second motif, which correlates with the first motif,
  • the second security feature is formed by an area with an optically variable layer system and the second motif by the outline of this area.
  • the security elements of the second and third aspect of the invention may, but need not be, see-through security features. Rather, the security elements may also be nontransparent, for example metallized and designed for viewing in supervision. This may be the case, for example, when microvoided mirrors are used as viewing elements. Also in the embodiments of the second and third aspect of the invention, the first and second motif are always in a sense context, wherein the statements made in connection with the first aspect of the invention on the meaning and the formation of this feature also apply here.
  • the second security feature is formed by a region with a thin-film element with a color-shift effect.
  • thin-film elements typically have a reflective layer, an absorber layer and an intermediate between the reflective layer and the absorber layer disposed dielectric spacer layer.
  • the color shift effect is based on viewing angle dependent interference effects due to multiple reflections in the different sublayers of the element.
  • the thin-film element is to be made semitransparent, for example for use in a see-through security element, then the thin-film element can consist of a dielectric layer enclosed by two thin metal layers, the metal layers in this case being made so thin that they are partially translucent.
  • the thin-film element can also be formed from a sequence of dielectric layers with different refractive indices.
  • the region with an optically variable layer system is additionally provided with embossed structures which lead to a shutter effect and / or additionally modify the color tilting effect.
  • embossed structures can be formed for example by sawtooth structures.
  • the second security feature is formed by a region having a liquid-crystalline material, for example a cholesteric liquid-crystal layer with the outline shape of the second motif.
  • the second security feature is formed by a color-variable layer system
  • a further coordination between the first and second security feature can be provided.
  • the imaged areas of the first motif are executed in color, so that the first motif appears when viewed in a predetermined color.
  • the color impression of the optically variable layer system is then used for adjusted to the color of the first subject under predetermined viewing conditions.
  • the optically variable layer system displays the same color as the enlarged images of the microoptical display arrangement, while in other viewing conditions the color shift effect of the optically variable layer system results in color differences between the two motifs.
  • the imaged areas of the first motif may be multicolored and / or their color may change in an angle-dependent manner.
  • a feature region of the first motif may contain metallic nanostructures in which volume or surface plasmons are excited by the incident electromagnetic radiation and / or resonance phenomena are caused.
  • the second motif is formed by a color-variable layer system, which for this purpose have a certain contour shape and / or can be created as a raster image.
  • the invention further includes a document of value such as a banknote, an identity card and the like, with a security paper or security element of the type described above.
  • a document of value such as a banknote, an identity card and the like
  • security paper is understood as a precursor to a value document that can not yet be processed and which can have further authenticity features in addition to the security element , Security paper is usually in quasi-endless form and will be further processed at a later date.
  • the security elements according to the invention can be introduced into a wide variety of substrates.
  • these can be stored in or on a paste piersubstrat, a paper with synthetic fibers, ie paper with a proportion x polymeric material in the range of 0 ⁇ x 100 wt .-%, a plastic film, for.
  • a film of polyethylene PE
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEN polyethylene naphthalate
  • PP polypropylene
  • PA polyamide
  • a multilayer composite in particular a composite of several different films (composite composite ) or a paper-film composite (foil / paper / foil or paper / foil / paper), wherein the security element can be provided in or on or between each of the layers of such a multilayer composite.
  • the security elements according to the invention can therefore not only be formed on a carrier film from which they can be transferred in a known manner to a security paper or document of value. It is also possible to design the security elements directly on the value document or security paper.
  • embossed structures in the form of refractory microlenses and optionally diffractive or refractive refractive optical elements can be generated directly on a plastic film of the value document or security paper, for example, in plastic banknotes or composite film banknotes to form a security element according to the invention.
  • FIG. 4 shows an enlarged detail of the banknote of FIG. 1 in the area of the through opening, FIG.
  • Fig. 5 shows another embodiment of an inventive
  • FIG. 7 shows a further exemplary embodiment of the invention in which both the first and the second security feature are present in the see-through security element, wherein (a) shows the security paper in cross-section and (b) shows an enlarged detail in the region of the through-opening in plan view, 8 shows a security element according to the invention, in which the second
  • Security feature is formed by a arranged within the micro-optical representation arrangement static image area,
  • FIG. 9 shows a further security element according to the invention, in which the second security feature is formed by an area with an optically variable layer system,
  • Fig. 10, 11 two film assemblies for security elements according to the invention with color-shifting thin-film elements as a second security feature
  • Fig. 12 shows a development of the design of Fig. 6 (a) according to a further embodiment of the invention.
  • Fig. 1 shows a schematic representation of a banknote
  • the banknote 10 contains two security features relating to each other in terms of their meaning, which represent two motifs arranged spatially in relation to each other in terms of their arrangement, shape and size.
  • a micro-optical representation arrangement for displaying at least one first motif is arranged in the see-through security element 12.
  • a microoptical display arrangement can be designed in particular as a moiré magnification arrangement, as a moiré-type microoptical magnification arrangement or as a modulo magnification arrangement.
  • FIG. 3 shows a schematic cross-sectional view of the layer structure of a microoptical display position arrangement 30, wherein only the parts of the layer structure required for the explanation are shown.
  • the micro-optical representation arrangement 30 contains a carrier 20 in the form of a transparent plastic film, for example an approximately 20 ⁇ m thick polyethylene terephthalate (PET) film.
  • PET polyethylene terephthalate
  • the upper side of the carrier foil 20 is provided with a grid-like arrangement of microlenses 22 which form on the surface of the carrier foil a two-dimensional Bravais lattice with a preselected symmetry.
  • the Bravais grating for example, have a hexagonal lattice symmetry.
  • other, in particular lower, symmetries and thus more general forms, such as the symmetry of a parallelogram grating are also possible.
  • the spacing of adjacent microlenses 22 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 22 preferably have a diameter between 5 ⁇ m and 50 ⁇ m and in particular a diameter between only 10 ⁇ m and 35 ⁇ m and are therefore not visible to the naked eye.
  • a motif layer 26 is arranged, which comprises a motif image with micro-cells, which is divided into a plurality of cells 24. romotivettin 28 contains.
  • the arrangement of the grid cells 24 also forms a two-dimensional Bravais grid with a preselected symmetry.
  • the Bravais lattice of the lattice cells 24 differs slightly in its symmetry and / or in the size of its lattice parameters from the Bravais lattice of the microlenses 22.
  • the consideration arises of the motif image is an enlarged image of the micromotif elements 28.
  • the grating period and the diameter of the grid cells 24 are of the same order of magnitude as those of the microlenses 22, that is preferably in the range of 5 ⁇ m to 50 ⁇ m and in particular in the range of 10 ⁇ m to 35 ⁇ m, so that the micromotif elements 28 usually themselves also have are not visible to the naked eye.
  • the optical thickness of the carrier film 20 and the focal length of the microlenses 22 are coordinated so that the motif layer 26 is located approximately at a distance of the lens focal length.
  • the carrier film 20 thus forms an optical spacer layer which ensures a desired, constant spacing of the microlenses 22 and the motif layer 26 with the motif image.
  • the microoptical representation arrangement contains a motif image 26, which is divided into a plurality of cells 24, in which respectively imaged regions 28 of the first motif are arranged, and a viewing grid of a plurality of viewing elements 22.
  • the first motif is reconstructed from the imaged regions 28 arranged in the cells, the first motif, depending on the design of the image.
  • micro-optical display arrangements 30 also allow impressive motion effects, as explained in more detail in the above-mentioned publications.
  • the grid parameters of the arrangement of the imaged areas and the viewing grid can be matched to one another such that when the display arrangement 30 is tilted, an orthoparallactic motion effect results, in which the first motif moves perpendicular to the tilt direction and not parallel to it, as one would intuitively expect.
  • the first motif of the first security feature is formed by a plurality of stars 42 which, in the manner explained above, when viewing the micro-optical representation arrangement 30 are reconstructed.
  • the representation arrangement 30 is designed such that the stars 42 move horizontally back and forth during the vertical tilting of the arrangement (tilting direction 44) (movement direction 46).
  • the stars 42 move vertically up and down, thus showing an orthoparallactic motion effect in both tilt directions.
  • motion effects are also particularly preferred in which the enlarged motifs, when tilting the security element relative to the tilting direction, move neither purely horizontally nor purely vertically but in a general direction.
  • This first security feature is now combined with a second security feature with a second motif, which in the embodiment is formed by the outline 48 of the through hole 14 and which is in a sense context with the first motif.
  • the motifs 42, 48 are related to one another in that both motifs 42, 48 are designed as seven-pointed stars of identical shape, ie represent the same image information with different sizes.
  • the first motif reconstructed by the micro-optical representation arrangement 30 can also contain a plurality of different partial motifs.
  • the stars 42 of FIG. 4 when viewed with respect to the image plane, may seem to float not only all in the same but also in different planes. It is also possible for some of the sub-motifs to float in front of, while other sub-motifs float behind the image plane.
  • the partial motifs, in this case the stars 42 are in each case miniaturized images of the outline 48 of the opening 14, and have the same shape as the latter.
  • the partial motifs can generally be reconstructed with different sizes, wherein, for example, the sub-motifs hovering above the image plane are larger, the sub-motifs hovering below the image plane can be made smaller.
  • FIG. 5 shows a further exemplary embodiment of a security paper according to the invention with coordinated first and second motifs.
  • a banknote 50 has a through opening 52 whose contour 54 follows the contour of the denomination of the banknote, for example the numerical sequence "50."
  • the opening 52 is provided with a transparent protective element 12 having a microoptical representation arrangement 30 of the above covered type described.
  • the micro-optical representation arrangement 30 likewise reconstructs the motif "50."
  • the imaged regions 28 and the enlargement of the representation arrangement 30 are here chosen such that the reconstructed first motif 56 has the same shape and size as that of FIG.
  • the first motif 56 is provided with a movement effect when tilting the display assembly 30, which can be described together with the magnification by a magnification and movement matrix, as explained in detail in the application DE 102007029 203.3.
  • the reconstructed first motif 56 coincides with the outline 54 of the opening 52 only when viewed from certain viewing directions.
  • 5 (a) shows the visual appearance when viewed from a general viewing direction in which the reconstructed first subject 56 is shifted from the outline 54 of the aperture 52. Only by suitable horizontal and vertical tilting of the representation arrangement 30, it is possible to fit the motif 56 exactly in the outline shape 54, as shown in Fig. 5 (b).
  • the banknote 50 also has a high security against counterfeiting, since not only a suitable opening 52 and a microoptical display arrangement 30 for producing the number sequence "50" are produced in the production but the display assembly 30 must also be provided with the correct orientation and magnification to fit the digit sequence "50" exactly in the intended outline of the opening 52.
  • FIG. 6 shows a security paper 60 with a through opening 62, whose outline 64 forms a bow window 66 and the silhouette 68 of a city.
  • the opening 62 is combined with a see-through safety element 12 with a micro-optical representation arrangement 30 of the type described above, which represents as a motive clouds 70, which move horizontally when tilting the display assembly 30 back and forth (direction of movement 72).
  • the magnification and movement matrix of the representation arrangement 30 can be selected such that the clouds 70 always move horizontally in the direction 72, regardless of the tilting direction of the arrangement 30.
  • Such a design combines a high degree of conspicuity and a high recognition value with a high degree of protection against forgery, since the display arrangement 30, including the movement effect, must be precisely matched to the complex outline shape of the opening 62.
  • Guidance on how to design the magnification and motion matrix to achieve the above effects is in the application
  • the sharp edges of the openings described with reference to Figs. 4, 5 and 6 (a) can be well formed by, for example, punching or laser cutting.
  • the openings can also be generated paper-making with edges with characteristic irregularities.
  • Particularly attractive and tamper-proof variants used apertures with a combination of sharp and characteristically irregular edges, which have already been generally described above.
  • the outline 84 of the opening 82 in the region of the sheet window 86 is made paper-making and has an irregular edge there.
  • a sharp edge area is generated by laser cutting as in Fig. 6 (a).
  • the opening 82 with the two different edge regions 86, 88 is then combined in the manner described above with a micro-optical representation arrangement for representing the clouds 70.
  • the irregular edge of the arc window 86 may be realized only in the upper region of the window, since the distance of the city silhouette 88 to the edge of the arc window 86 in the lower window area may be too low.
  • each two security features with first and second, standing in a meaningful motives.
  • the context of meaning in the exemplary embodiments explained below is illustrated in each case by motifs of the same shape (seven-pointed stars). It is understood, however, that the motives also in the other embodiments be generally related to each other or can complement each other to a total information or a coherent overall picture.
  • FIGS Representation arrangement 30 formed combined with a second security feature with a second motif, which is also in the above a through opening 14 of a security paper 90 arranged Castelsssêt element 92 is present.
  • the second security feature is a diffractive optical element 94 that generates a projection image 104 with the second motif which can be trapped on a screen 102 from a passing beam 100 of substantially parallel light in transmission.
  • the second motif is in a sense context with the first motif of the micro-optical representation arrangement 30 and, in the exemplary embodiment, also represents a seven-pointed star 104 with the same shape as the stars 42.
  • first area areas 96 and second area areas 98 in which the microoptical display arrangement 30 (first area areas 96) or the diffractive optical element 94 (second surface areas 98) is present.
  • the division into first and second surface areas 96, 98 can take place arbitrarily.
  • partitions which are based on the outline shape of the opening 14, as shown in FIG. 7 (b), for example, alternate sequences of stripes or rectangles may also be considered.
  • the outline shape 48 of the opening 14 forms a third security feature with a third motif which, as in the embodiment of FIG. 4, forms a seven-pointed star.
  • the security paper 90 thus has three different security features, each representing the same motif or generate.
  • the first security feature namely the reconstructed stars 42 of the micro-optical representation arrangement 30, and the third security feature, namely the star-shaped outline 48 of the opening 14, are easily recognizable by the naked eye.
  • the second security feature namely the star representation 104 encoded in the diffractive optical element 94, represents a higher-level security feature that is generated only when the see-through security element 92 is irradiated with a laser pointer 106 and can be collected on a screen 102. Under special lighting and viewing conditions, the star may also be visible to the naked eye.
  • the second security feature of the see-through security element 12 it is also possible to use a refractive optical element instead of a diffractive optical element, which generates from a passing beam of essentially parallel light or from a distant point light source a second motif recognizable with the naked eye and without aids, such as in the publication WO 2007/137744 A2 and in the application PCT / EP2008 / 002841 described in more detail.
  • the second motif can be projected onto a screen with a laser.
  • the structural elements of the diffractive optical element 94 or of the refractive optical element can be embossed together with the microlenses 22 of the micro-optical representation arrangement 30.
  • the structures can be brought together with the microlenses on a tool with the highest register accuracy.
  • the micromotif elements 28 of the depiction arrangement 30 can then be embossed over the entire area onto the back side of the film. It has been found that the functionality of the arranged on the front diffractive or refractive optical elements is practically not affected by such a back side embossing. Alternatively, however, those film regions which contain diffractive or refractive optical elements on their front side can also be recessed in the back side embossing of micromotif elements 28.
  • enlarged images 42 are not seen in the regions provided with diffractive or refractive optical elements, such as the second surface regions 98 of FIG. 7 (b). This effect can be used for interesting combinations with motion effects of the micro-optic display assembly 30 since the moving enlarged images 42 will vanish on reaching the second surface areas 98, or appear to emerge from nowhere.
  • the areas provided with diffractive or refractive optical elements appear uniform in the color of the micromotif elements, albeit with a reduced color intensity corresponding to the area coverage of the micromotif elements.
  • the security elements applied to the security paper may not only be see-through security elements, but also non-transparent security elements in which the microstructures of the microoptical imaging arrangement are made visible, for example, by metallization.
  • the security elements described below may be transparent, partially transparent or non-transparent, depending on the desired purpose.
  • the security elements according to the invention have a first security feature, which is formed by a micro-optical representation arrangement 30 for displaying at least a first motif, and a second security feature with at least one second motif, which is in a meaningful context with the first motif.
  • the second security feature is formed by a static image area 112 arranged inside the microoptical display arrangement 30, in which either no microlenses 22 are provided, or in which the optical effect of the microlenses 22, for example by leveling Microlenses 22 with a transparent paint of sufficient thickness and similar refractive index, is neutralized.
  • the second motif which is meaningfully connected to the first motif, is formed by the outline 114 of the static image region 112.
  • the static image area 112 likewise has the shape of a seven-pointed star 114, thus representing the same motif as the stars 42 of the micro-optical representation arrangement 30.
  • the static image area 112 In the static image area 112, due to the absence of microlenses 22 or due to the neutralization of their optical effect, no enlarged images 42 occur. Therefore, in micro-optical display assemblies 30 having motion effects, the images 42 appear to dissolve upon reaching the outline 114 of the static image area 112, or appear to emerge on the opposite side.
  • the static image area 112 represents a fixed, colored area whose color impression is determined by the color of the micromotif elements of the representation arrangement 30. Again, the color intensity of the region 112 is reduced compared to the color intensity of the micromotif elements 28 corresponding to the area coverage of the micromotif elements.
  • microvoided mirrors are used as viewing elements, as is not shown here, then they can be neutralized in some areas by recessed or subsequently removed the mirroring at the corresponding locations. If a continuous mirroring is used, the embossing of the micro-hollow mirrors in the corresponding areas can instead be dispensed with.
  • thin metal layers are suitable as silvering.
  • FIG. 9 shows a further exemplary embodiment 120 of the invention, in which the second security feature is formed by a region 122 with an optically variable layer system and the second motif by the outline shape of this region 122.
  • the optically variable layer system region 122 represents a plurality of seven-pointed stars 124, 126 which have the same shape as the stars 42 of the micro-optical representation arrangement 30. It is understood that the motif of the optically variable layer system region 122 also converts the enlarged images 42 into an image. can complement or even form a coherent overall picture with them.
  • the optically variable layer system region 122 may be located both within (star 126) and outside (stars 124) of the region of the microoptical representation arrangement 30, as illustrated in FIG. 9.
  • the optically variable layer system may be a liquid crystalline material region, or what is presently preferred, a thin-film color-shifting element region.
  • the thin-film element may be opaque or semitransparent.
  • layer sequences of absorber layer - dielectric layer - reflector layer are used, in which the reflector layer is formed so thick that it is opaque to light.
  • Semitransparent thin film elements may also consist of a dielectric layer enclosed by two metal layers, in which case both metal layers are made thin enough to be partially transparent.
  • a semi-transparent layer sequence can also be produced from a sequence of dielectric layers with different refractive indices.
  • the motif image 26 of the representation arrangement 30 consists of colored microphoto elements 28, then the color impression of the color-shifting thin layer layer element when viewed under predetermined viewing conditions adapted to this color. Under these viewing conditions, the optically variable layer system region 122 then displays the same color as the enlarged images 42 of the microoptical representation assembly 30.
  • the region 122 of FIG. 9 may be designed so that its color impression changes from magenta when viewed perpendicularly to green when viewed obliquely.
  • the micro-motive elements 28 are likewise designed in magenta so that a magenta color impression results for the stars 42, which, unlike the color impression of the ink-tilting region 122, remains essentially unchanged when the security element is tilted.
  • the stars 42 When viewed perpendicularly, the stars 42 which lie within the middle star 126 of the optically variable layer system region 122 are virtually invisible, since both the stars 42 and the color-shifting region 122 appear magenta. If the security element is tilted or the viewer changes its position, the color of the stars 124, 126 of the fbilting region 122 changes from magenta to green, while the color of the enlarged stars 42 remains unchanged. The stars 42 then emerge clearly with a magenta appearance against a green background.
  • this metallization layer can also be used as a reflector layer for the thin-film element.
  • a corresponding film structure of a security element 130 is shown schematically in cross section in FIG.
  • the first motif formed by the micromotile elements 28 is reconstructed in a first region 132 when the metallized motif layer 26 is viewed through the microlenses 22.
  • the second region 134 there is a thin-film thin-film element 136 which comprises a partially transparent absorber layer 138 made of chromium, a vapor-deposited dielectric SiO 2 spacer layer 140 and a reflection layer 142 formed by an opaque aluminum layer.
  • the opaque reflection layer 142 of the second region 134 forms the metallization layer 26 of the microoptical representation arrangement 30 in the first region 132.
  • the thin film element 136 is viewed through the microlenses 22, thereby possibly modifying and / or attenuating its color-shifting properties.
  • a film structure 150 as shown in FIG. 11 may be used, in which the thin-film element 136 is applied to the viewer-facing side of the microlenses 22.
  • a further embodiment variant is that, unlike the variant of FIG. 10, in which the thin-film element 136 is arranged next to the area 132 occupied by micromotif elements 28, the color-tilting coating is applied to the surface occupied by micromotif elements. This can be done without a spacer layer, so that the color-shifting coating is applied directly to the area occupied by micromotif elements.
  • the second motif can be drawn from the outline of the color-tilting coating, but it can also be created as a raster image.
  • a semitransparent color-shifting layer system which reproduces the information of the second motif, is brought between the microlenses and the motif layer, wherein the plane of the micromotif elements is still in the focus of the microlenses.
  • the following procedure can be used to produce the film structure 150 of FIG. 11: First, the desired microstructures on the back side of a PET film 152 are embossed. The microlens embossing then takes place on the front side of the foil, wherein no microlenses are embossed in the second region 134, in which the thin-film elements which tip over the fibers are provided. Then, the first areas 132 provided with microlenses 22 are printed with a wash ink and the thin-film layer system 142, 140, 138 is vapor-deposited over the whole area. By washing out the wash paint, the vapor-deposited layers in the first region 132 are removed. Finally, the embossed microstructures of the backside of the film are coated with a metal layer 154 in full surface.
  • microstructures are not vapor-deposited, but filled with paint, it may be advantageous to make the thin-film element semitransparent.
  • the color of the microstructures then shimmers through the thin film element 136 and facilitates color matching of thin film element and microstructures.
  • optically variable layer systems provided in the second regions 134 can also be applied semitransparently to the microlenses 22. without leveling or saving them. In this case, the enlarged images can be seen through the optically variable layer system, as shown for example in FIG. If, instead of the semitransparent, optically variable layer system, a completely reflecting color-shifting layer system is used, the enlarged images can only be seen in the released areas.
  • FIG. 12 shows a further development of the design already described in connection with FIG. 6 (a), in which the security paper 160 has been provided with a laser-modifiable marking substance in an environment of the through opening 162.
  • the laser-modifiable marking substance displays a desired color change, in the exemplary embodiment from colorless to red.
  • the laser-modifiable marking substance was then laser-shaped in the form of desired markings 164, for example the doors shown in the figure or the church clock, modified.
  • both the sharp edge 166, 168 of the opening 162 can be cut in the same operation with the same laser beam, and the marking substance in the form of the markings 164 can also be modified when the laser energy is reduced.
  • the locally introduced laser energy can be reduced by reducing the laser power and / or increasing the deflection speed of the laser beam.
  • the markings 164 can thereby be precisely registered to the edge of the opening 162 and thus to the city silhouette 168. Further information on the equipment of security paper with laser-modifiable markers can be found in the application PCT / EP2008 / 004921, the disclosure of which is incorporated in the present application in this respect.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un papier de sécurité (10) pour la fabrication de documents de sécurité ou de valeur, comprenant un élément de sécurité transparent (12) qui est disposé dans ou au-dessus d'une fenêtre ou d'une ouverture passante (14) du papier de sécurité (10). L'invention est caractérisée en ce que l'élément de sécurité transparent (12) comporte une première caractéristique de sécurité qui est formée par un système de représentation micro-optique (30) destiné à représenter au moins un premier motif, le système de représentation micro-optique (30) contenant une image à motif qui est subdivisée en une pluralité de cellules (24) dans lesquelles sont disposées respectivement des zones (28) reproduites du premier motif ainsi qu'une grille de visualisation composée d'une pluralité d'éléments de visualisation (22) qui, lorsqu'on regarde l'image du motif, reconstruit le premier motif à partir des zones (28) reproduites disposées dans les cellules (24), et en ce que le papier de sécurité (10) comporte une deuxième caractéristique de sécurité (14) avec au moins un deuxième motif qui est en rapport avec le premier motif.
EP09799257.2A 2008-12-16 2009-12-15 Élément de sécurité et papier de sécurité Active EP2385902B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008062475A DE102008062475A1 (de) 2008-12-16 2008-12-16 Sicherheitselement und Sicherheitspapier
PCT/EP2009/008967 WO2010075954A1 (fr) 2008-12-16 2009-12-15 Élément de sécurité et papier de sécurité

Publications (2)

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EP2385902A1 true EP2385902A1 (fr) 2011-11-16
EP2385902B1 EP2385902B1 (fr) 2014-09-17

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EP (1) EP2385902B1 (fr)
DE (1) DE102008062475A1 (fr)
WO (1) WO2010075954A1 (fr)

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GB0919108D0 (en) * 2009-10-30 2009-12-16 Rue De Int Ltd Security device
DE102010025775A1 (de) 2010-07-01 2012-01-05 Giesecke & Devrient Gmbh Sicherheitselement sowie Wertdokument mit einem solchen Sicherheitselement
DE102011112554A1 (de) * 2011-09-06 2013-03-07 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Sicherheitspapiers und Mikrolinsenfaden
DE102012025266A1 (de) * 2012-12-21 2014-06-26 Giesecke & Devrient Gmbh Sicherheitselement mit Linsenrasterbild
EP2767395A1 (fr) 2013-02-15 2014-08-20 KBA-NotaSys SA Substrat pour papiers de sécurité et son procédé de fabrication
DE102013016041A1 (de) * 2013-09-26 2015-03-26 Giesecke & Devrient Gmbh Sicherheitselement mit Linsenrasterbild
DE102013021358A1 (de) * 2013-12-16 2015-06-18 Giesecke & Devrient Gmbh Sicherheitselement für Sicherheitspapiere
DE102014007108A1 (de) * 2014-05-14 2015-11-19 Giesecke & Devrient Gmbh Sicherheitselement
DE102015000690A1 (de) * 2015-01-20 2016-07-21 Giesecke & Devrient Gmbh Datenträger mit einem Fenstersicherheitsfaden
DE102015003785A1 (de) * 2015-03-23 2016-09-29 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Fensters in einem Papiersubstrat mit einem Sicherheitselement
GB2537830B (en) * 2015-04-24 2017-05-31 De La Rue Int Ltd Improvements in security substrates

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GB9309673D0 (en) 1993-05-11 1993-06-23 De La Rue Holographics Ltd Security device
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DE102008062475A1 (de) 2010-06-17
WO2010075954A1 (fr) 2010-07-08

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