EP2091756A2 - Elément de sécurité transparent doté de microstructures - Google Patents

Elément de sécurité transparent doté de microstructures

Info

Publication number
EP2091756A2
EP2091756A2 EP07819023A EP07819023A EP2091756A2 EP 2091756 A2 EP2091756 A2 EP 2091756A2 EP 07819023 A EP07819023 A EP 07819023A EP 07819023 A EP07819023 A EP 07819023A EP 2091756 A2 EP2091756 A2 EP 2091756A2
Authority
EP
European Patent Office
Prior art keywords
see
security element
microstructure
element according
structural elements
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
EP07819023A
Other languages
German (de)
English (en)
Other versions
EP2091756B1 (fr
Inventor
Manfred Heim
Marius Dichtl
Michael Rahm
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
Priority to EP15001325.8A priority Critical patent/EP2939845B1/fr
Publication of EP2091756A2 publication Critical patent/EP2091756A2/fr
Application granted granted Critical
Publication of EP2091756B1 publication Critical patent/EP2091756B1/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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • B42D2033/24—
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

  • the invention relates to a see-through security element for security papers, documents of value and the like having at least one microstructure with a viewing appearance-dependent visual appearance.
  • Data carriers such as security documents or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers 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 tearing thread for product packaging, an applied security strip, a cover sheet for a banknote with a continuous opening or a self-supporting transfer element, such as a patch or a label its production is applied to a document of value.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are thereby equipped with optically variable elements which give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • the object of the invention is to specify a see-through safety element of the type mentioned at the outset, which avoids the disadvantages of the prior art.
  • the visual security element as a security feature have easily recognizable optical information that offers a high protection against counterfeiting and does not require special lighting conditions for the authenticity test.
  • the at least one microstructure is formed from an arrangement of a multiplicity of structural elements with a characteristic structural spacing of 1 ⁇ m or more.
  • the see-through security element according to the invention has a total thickness of 50 microns or less.
  • the arrangement according to the invention of a plurality of structural elements can be a regular, irregular or region-wise regular arrangement.
  • the invention thus encompasses any arrangement of a multiplicity of structural elements which has a structure spacing of 1 ⁇ m or more.
  • the see-through security element preferably has a transparent or translucent substrate and a marking layer applied to the substrate, which contains the at least one microstructure.
  • any transparent or translucent substrate can be used for the see-through security element.
  • the light transmittance must be at least so large that in the transmitted light the viewing angle-dependent appearance can be perceived by the viewer.
  • the use of an additional means of illumination to improve the visibility of the appearance by the viewer is conceivable, although the thickness of the material is chosen according to the invention so that the optically variable appearance of the see-through security element is possible without tools.
  • paper in particular cotton vellum paper, is fundamentally conceivable as a substrate.
  • paper which contains a proportion of polymeric material in the range of 0 ⁇ x ⁇ 100% by weight.
  • the substrate is a plastic, in particular a plastic film, for.
  • a plastic film of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA) is.
  • the film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature.
  • the tools required for exploiting these properties, such as polarization filters, are known to the person skilled in the art.
  • the substrate is a multilayer composite, in particular a composite of several different films (composite composite).
  • composite composite can be z. B. be formed from the aforementioned plastic materials.
  • Such a composite is characterized by an extremely high stability, which is for the durability of the security element of great advantage. Also, these composite materials can be used in certain climatic regions of the earth with great advantage.
  • All materials used as a substrate may have additives which serve as authenticity features. It is primarily to be thought of luminescent, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, eg. B. a UV or IR radiation emitting radiation source, can be excited to produce a visible or at least detectable luminescence.
  • a suitable tool eg. B. a UV or IR radiation emitting radiation source
  • the marking layer ie z.
  • the marking layer of the see-through security element represents a colored embossing lacquer layer, the layers of which leave it during the embossing, d. H. unembossed areas form the structural elements of the at least one microstructure.
  • the marking layer of the see-through security element is a transparent or translucent embossing lacquer layer which has impressed recesses and subsequently filled with colored material, which form the structural elements of the at least one microstructure.
  • the depressions can have any desired shape or outline shape.
  • the marking layer of the see-through security element is a printed layer having areas of high light transmission and areas of low light transmission, the areas of low light transmission forming the structural elements of the at least one microstructure.
  • the marking layer of the see-through security element is a micro-gravure printing layer with areas of high transparency and areas of low light transmission, wherein the areas of low light transmission form the structural elements of the at least one microstructure.
  • the see-through security element preferably has a total thickness of 20 ⁇ m or less, more preferably from 3 ⁇ m to 10 ⁇ m.
  • the structural elements of the microstructure expediently have a characteristic structure spacing of 5 ⁇ m or more.
  • the structural elements each have a structure size of 1 ⁇ m or more, preferably of 3 ⁇ m or more.
  • height-to-width ratios of about 1: 5 to about 5: 1 are considered to be advantageous and from about 1: 1 to about 5: 1 are considered to be particularly advantageous.
  • At least one of optionally a plurality of microstructures is formed by a lamellar structure of a plurality of substantially parallel lamellae.
  • the visual appearance of the microstructures then changes as you rotate or tilting the security element by the relative to the parallel slats changing direction of view.
  • the security element it is particularly preferable to provide a plurality of microstructures formed by lamellae structures, which differ in one or more of the parameters lateral orientation, color, width, height, relief shape and distance.
  • the differing lamellar structures can advantageously be arranged in the form of patterns, characters or a coding which appear, change or disappear, in particular when the security element is turned or tilted.
  • At least one of optionally a plurality of microstructures is formed by a multiplicity of recesses with an increased transparency in a marking layer, so that the visual appearance of the microstructure when the security element is rotated or tilted by the viewing direction changing relative to the recesses changed.
  • the plurality of depressions can be arranged with advantage in the form of patterns, characters or a coding, which appear in particular when turning or tilting the security element, change or disappear.
  • the structural elements are provided in partial areas with an opaque, transparent, semi-transparent, reflective or absorbent coating.
  • the coating can be single-layered or multi-layered and, with particular advantage, a thin-film element with a color-shift effect, ie be optically variable.
  • single-layer thin-film elements coatings of so-called pearlescent pigments are to be mentioned in the first place.
  • Multilayer thin-film elements are generally referred to as purely dielectric Dünn GmbHst ⁇ ikturen or metallic / dielectric multilayer structures formed. In the multilayer thin-film elements, three-layered interference layer structures (metal / dielectric three-layer structure) are currently particularly preferred.
  • the structural elements may be provided in partial areas with a metallic coating, with a light-absorbing moth-eye structure or else with a diffractive structure which diffracts substantial parts of the incident light away from the viewer.
  • the structural elements have an asymmetrically arranged coating, moth-eye structure or diffractive structure.
  • the asymmetric arrangement on the structural elements z. B. be achieved by an oblique evaporation.
  • the see-through security element has a transparent or translucent substrate with a first and an opposite second surface, wherein a transparent mask is applied to the first surface as a microstructure.
  • a congruent see-through mask is applied to the second surface at a predetermined lateral offset of 100 ⁇ m or less.
  • the see-through mask preferably includes a motif in the form of patterns, characters, or a code that is visually discernible only at a particular viewing angle.
  • the see-through masks are each formed by an opaque layer with translucent openings, wherein the openings have a size of less than 200 microns, preferably a size of about 3 microns to about 100 microns, and a motif in the form of patterns, characters or a Form coding.
  • the offset of the see-through mask is tuned to the size of the openings and the thickness of the substrate, and is preferably substantially less than 100 ⁇ m, for example, only about 20 ⁇ m or less, or even only about 10 ⁇ m or less.
  • the see-through security element according to the invention can advantageously have further security elements in order to further increase the security against counterfeiting.
  • the additional security element may be a transparent or semitransparent coating, which is constructed in one or more layers.
  • optically variable layers in particular interference layers, can be used to advantage.
  • the person skilled in the art is sufficiently familiar with purely dielectric thin-film structures, metallic / dielectric multilayer structures and the materials used in each case for the layers of these interference layer systems.
  • an additional security element can also be regarded as part of the see-through security element according to the invention, in particular if, as in the case of the above-mentioned thin-film elements with color shift effect, the further security element (interference layer structure) is arranged on or under the microstructure.
  • the synergistic interaction of the microstructure with the additional security element results in a significant increase in the security against counterfeiting and an appreciation of the visual appearance of the see-through security element according to the invention.
  • the additional coating can be superimposed or underlaid on the microstructure of the see-through safety element.
  • a particularly impressive, additional optically variable effect can, for. Example, be obtained when the additional optically variable coating between the transparent or translucent substrate and the microstructure-containing marking layer is arranged.
  • the synergistic interaction of the optically variable microstructure and the additional optically variable coating considerably increases the security against forgery of the see-through security element.
  • the additional coating may have at least partially machine readable properties.
  • the additional coating also advantageously has magnetic, electrically conductive or luminescent properties.
  • the additional security element may, however, advantageously also be diffraction structures, kinematic structures or matt structures.
  • holograms may be used as diffractive structures provided with a transparent or semitransparent metal layer or high refractive dielectric coating.
  • the additional security element can also be in the form of a liquid-crystal layer, in particular as a cholesteric or nematic liquid-crystal layer, or in the form of a multilayer arrangement cholesteric and / or nematic liquid crystals.
  • the formation of the additional security element as a pressure element is possible.
  • the printing element may advantageously contain a color that absorbs and / or emits in the infrared (IR) or ultraviolet wavelength range (fluorescence or phosphorescence), which enables machine detection. Also, the printing element may contain optically variable or iridescent pigments.
  • a non-diffractive or diffractive lens structure for.
  • a Fresnel lens arrangement as an additional security element with the microstructure according to the invention can be combined.
  • the invention also encompasses a method for producing a see-through safety element of the type described, in which the see-through safety element is provided with at least one microstructure having a viewing angle-dependent visual appearance comprising at least one microstructure of an arrangement of a multiplicity of structural elements with a characteristic Structure pitch of 1 micron or more is formed and the see-through security element is produced with a total thickness of 50 microns or less.
  • the at least one microstructure is formed in the form of a regular, irregular or partially regular arrangement of a plurality of structural elements.
  • a marking layer is advantageously applied to a transparent or translucent substrate in which the at least one microstructure is formed.
  • a colored embossing lacquer layer is applied as a marking layer, for example printed on it, and the embossing lacquer layer is structured by embossing techniques in such a way that the regions which are left in embossing, ie not embossed, form the structural elements of the at least one microstructure.
  • a transparent or translucent embossing lacquer layer is applied as the marking layer, for example printed on it, and recesses are introduced into the embossing lacquer layer by means of embossing techniques.
  • the depressions in the embossing lacquer layer are then filled with colored material, for example a printing ink, so that the filled depressions form the structural elements of the at least one microstructure.
  • the depressions can have any shape and are also referred to below as "trenches”.
  • a printing layer having regions of high light transmittance and regions of low light transmittance is applied as the marking layer, the regions of low light transmittance forming the structural elements of the at least one microstructure.
  • the microfill printing method is to be mentioned here, in which the microstructure is applied to the substrate by a) a tool shape is provided whose surface has an arrangement of elevations and depressions in the form of the desired microstructure,
  • the substrate is pretreated for a good anchoring of the colored or colorless lacquer
  • the depressions of the mold are filled in step b) with a radiation-curing lacquer and the lacquer in step e) by applying Radiation, especially with UV radiation, is cured.
  • Radiation especially with UV radiation
  • the paint can advantageously be pre-cured in the recesses of the tool mold prior to contacting the step d).
  • the microstructure of the mold is formed by microstructure elements having a line width between about 1 ⁇ m and about 10 ⁇ m. It is also preferred if the macrostructure of the tool mold is formed by microstructure elements with a structure depth between approximately 1 ⁇ m and approximately 10 ⁇ m, preferably between approximately 1 ⁇ m and approximately 5 ⁇ m.
  • the see-through security element is produced with a total thickness of 20 ⁇ m or less, preferably from 3 ⁇ m to 10 ⁇ m.
  • At least one microstructure can be formed by a lamellar structure of a plurality of substantially parallel lamellae.
  • At least one microstructure in a marking layer is formed by a multiplicity of depressions with an increased light transmission.
  • the structural elements are provided in partial areas with an opaque, transparent, semitransparent, reflective or absorbing coating, in particular with a metallic coating, a moth-eye structure or a diffractive structure.
  • a transparent or translucent substrate having a first surface and an opposing second surface is provided, a see-through mask is applied to the first surface as a microstructure, and a congruent see-through mask with a predetermined lateral offset of 100 ⁇ m or less applied to the second surface.
  • the transparency masks are applied simultaneously to the opposing surfaces of the substrate in an advantageous process management.
  • the see-through masks may also be sequentially applied to the opposing surfaces of the substrate.
  • the see-through masks are applied to the opposite sides of the substrate by means of the micro-gravure printing technique described above.
  • the invention also includes a security paper for the production of security or value documents, such as banknotes, checks, identity cards, certificates or the like, and a data carrier, in particular a branded article, a document of value or the like, wherein the security paper or the data carrier with a security element of described type are equipped.
  • a security paper for the production of security or value documents, such as banknotes, checks, identity cards, certificates or the like
  • a data carrier in particular a branded article, a document of value or the like, wherein the security paper or the data carrier with a security element of described type are equipped.
  • the described measures ensure that the see-through security elements according to the invention are thin enough so that they can also be used in the field of documents of value and that they can also be economically produced in the required high quantities with the proposed methods.
  • the structure spacing of 1 ⁇ m or more, or the structure size of 1 ⁇ m or more ensures that the microstructures are largely achromatic, ie without disturbing color splitting. The optically variable effects can therefore be easily recognized even under unfavorable lighting conditions.
  • the see-through security element With the see-through security element according to the invention, it is advantageously possible to achieve a series of so-called movement effects which, on the one hand, further improve counterfeiting security and, on the other hand, are visually very appealing to the observer.
  • movement effects which are also referred to as flip, run or pump effects. In these effects, the viewer perceives an apparent movement of the observed structure when tilting the see-through security element due to the changing in a defined manner optical impression.
  • FIG. 1 is a schematic representation of a banknote with a see-through security element according to the invention
  • FIG. 2 shows a cross section through an inventive see-through security element with shutter image
  • Fig. 3 shows a cross section through a see-through security element
  • Venetian blind in which the slats are designed in trapezoidal shape
  • FIG. 5 shows a schematic plan view of a see-through security element according to a further exemplary embodiment of the invention
  • FIG. 6 shows a section of the banknote of FIG. 1 with a see-through security element according to the invention, in which the denomination of the banknote is repeated as an optically variable element, FIG.
  • FIG. 7 shows a cross section through a see-through security element according to the invention with a marking layer which contains a pattern of depressions
  • FIG. 8 shows, by way of example, some shapes for depressions which in each case impart a defined increased transparency to the marking layer, wherein (a) shows depressions of different width and depth and (b) depressions with different outline shapes and sizes, FIG.
  • FIG. 9 shows a see-through security element according to the invention with a symmetrical lamellar structure which is provided with an asymmetrical opaque coating
  • 10 shows a security element similar to that of FIG. 9, in which the
  • Structural elements have more surfaces of different inclination
  • FIG. 11 shows a security element similar to that of FIGS. 9 and 10 with FIG.
  • FIGS. 9 to 11 shows a security element similar to that of FIGS. 9 to 11, in which the structural elements are provided in partial regions with light-absorbing moth-eye structures,
  • Fig. 13 is a see-through security element with on opposite
  • FIG. 14 shows a schematic plan view of a see-through security element according to yet another exemplary embodiment of the invention.
  • FIG. 15 shows a cross section through a further security element according to the invention, which has microstructure elements provided with an optically variable coating.
  • the invention will now be explained using the example of a security element for a banknote. 1 shows a schematic representation of a banknote 10 with a see-through security element 12 with a blind image, which is arranged above a see-through region 14, for example a window region or a continuous opening of the banknote 10.
  • the through opening may after the preparation of the substrate of the banknote 10, z. B. be produced by punching or laser beam cutting.
  • it is also conceivable to produce the through opening during the production of the banknote substrate as described in WO 03/054297 A2. In that regard, the disclosure of WO 03/054297 A2 is included in the present application.
  • the shutter image of the see-through safety element 12 shows a different visual appearance, depending on the viewing direction.
  • the security element 12 may appear structureless and bright when viewed vertically, while dark marks in the form of patterns, characters or encodings emerge when the banknote is tilted or rotated. In other designs, the markings are already visible when viewed vertically and disappear or change when turning or tilting the bill.
  • the see-through security element 12 in the banknote 10 or other securities is its small overall thickness of less than 50 microns.
  • the see-through security element even has an even smaller layer thickness of only about 20 ⁇ m or even only about 3 ⁇ m to 10 ⁇ m.
  • the invention provides several options for producing optically pleasing shutter images with such low total thicknesses.
  • a first possibility to produce a thin see-through security element with blind image is illustrated by the cross section through the security element 12 in FIG. 2.
  • a thin layer of a colored embossing lacquer 22 is first applied to a transparent substrate 20.
  • the embossing lacquer layer 22 is then structured by means of embossing techniques in such a way that a lamellar structure is formed from a multiplicity of substantially parallel, individually standing lamellae 24.
  • the security element 12 When viewed parallel to the slats 24, that is, in the direction of view 26, the security element 12 appears to be substantially transparent when viewed. On the other hand, if the observer tilts the security element 12 out of the parallel viewing direction, for example in the direction of view 28, then the lamella 24 blocks the view, ie. H. the security element 12 appears opaque to the viewer.
  • the lamellar structure represents a regular arrangement of a plurality of lamellae 24 with a characteristic structure spacing, which according to the invention is 1 ⁇ m or more, so that the lamellae 24 do not cause color splitting in the visible spectral range by wavelength-dependent diffraction effects.
  • the spacing of adjacent lamellae 24 is 5 .mu.m
  • the structure size ie the width of the individual lamellae at 2.5 microns.
  • the height of the embossed fins 24 is 5 microns, so that there is a height-to-width ratio of 2: 1. In general, this ratio is between about 1: 5 and about 5: 1, preferably around or above 1: 1 up to about 5: 1.
  • the rectangular profile of the slats 24 shown in FIG. 2 represents an idealization of the actual conditions in an embossed lacquer layer
  • the transitions at the top and bottom edges of the slats are rounded to some extent and the edges of the slats 24 are not completely vertical.
  • the slope of the flanks is preferably between about 70 ° and about 85 °.
  • the transitions at the top and bottom edges of the slats are not completely sharp, but slightly rounded.
  • the brightness of the security element 12 in view can be adjusted by the ratio of slat width to slat spacing in a wide range. Also, the color impression can be selected largely freely by the color of the embossing lacquer and the transparent or translucent substrate.
  • a layer of a colorless embossing lacquer 32 can also be applied to the substrate 20, as shown in FIG. 4.
  • the colorless embossing lacquer 32 is then first structured with an embossing tool in such a way that depressions or trenches 34 in the form of the desired shade image are created, as illustrated in FIG. 4 (a). Subsequently, the recesses 34 are filled with color 36, as shown in Fig. 4 (b), to produce a shutter image with the desired color impression.
  • FIG. 5 shows a schematic plan view of a see-through security element 40 according to a further exemplary embodiment of the invention.
  • the security element 40 has a first lamellar structure in a first region 42, the parallel lamellae 44 of which run vertically in the view of FIG.
  • second regions 46 a second lamellar structure is provided which has the same lamella width and the same lamellar spacing as the first lamellar structure, but whose likewise parallel lamellae 48 are oriented at right angles to the lamellae 44.
  • the security element 40 When viewed vertically, the areas 42 and 46 are virtually indistinguishable in their visual appearance due to their uniform area coverage, the security element 40 appears structureless and bright. If the security element is then tilted to the right or left by a certain angle (tilting direction 50) Thus, the tilted slats 44 obstruct the viewer's view, while the spaces between the parallel slats 48 in the areas 46 still allow a view. For the viewer, bright circles 46 thus appear in front of a dark background 42.
  • louvers 48 obstruct the view, while the spaces between the louvers 44 keep the area 42 transparent.
  • the viewer now sees dark circles 46 against a light background 42.
  • the security element of Fig. 5 is an additional transparent or semitransparent, z. B. optically variable coating, the z. B. between the substrate and the microstructure or on the microstructure is arranged.
  • the security against forgery of the security element shown in Fig. 5 is further increased.
  • the simple geometric pattern of FIG. 5 may be extended to more complex patterns, characters, or encodings.
  • the denomination 16 of the currency attaining banknote 10 may be repeated in the see-through security element 12 in the form of areas 60, 62 having different louver orientation, as shown in FIG.
  • the see-through security element 12 appears structureless when viewed vertically, while the tilting of the banknote depending on the direction of tilting the digit sequence "10" emerges bright against a dark background or dark against a light background.
  • FIG. 14 Another see-through security element according to yet another embodiment of the invention is shown in FIG.
  • the security element 140 of FIG. 14 basically has a similar structure to the security elements of FIGS. 5 and 6, which is why reference is made to the statements made with regard to these figures.
  • the essential difference between the see-through security element 140 with respect to the see-through security elements of FIGS. 5 and 6 is that the areas of differently oriented lamellar structures are clearly less sharply delimited from one another. While, for example, the areas 42 and 46 of the security element 40 of FIG. 5 are arranged perpendicular to one another, the louvers 141, 147 of the security element 140 of FIG. 14 have only a non-rectilinear profile in most areas, the differences in the direction of travel being adjacent Areas are relatively small. As can be seen from FIG. 14, the meander-shaped blades 141 in the regions 144 and 145, on the other hand, have a course which differs from the preferred embodiment shown in FIG. 14 from top to bottom. direction, which is predetermined by the slats 147 of the area 143, deviates significantly.
  • the security element 140 When viewed vertically, the areas 143 and 144 and 145 practically do not differ in their visual appearance due to their equal area coverage, the security element 140 appears substantially featureless and bright. However, if the security element 140 is tilted by a certain angle to the right or left (FIG. Tilting direction 150), the tilted slats 147 adjust the viewer's view, while the spaces between the slats 141 in the areas 144 and 145 at least partially permit a view to a considerable extent. In contrast to the very sharply delimited regions 42 and 46 when the security element 40 of FIG.
  • the interstices of the louvers 147 keep the region 143 translucent, while the now tilted louvers 141 of the regions 144, 145 substantially block the view. Accordingly sees the Observers now have dark areas 144, 145 which merge continuously into the bright areas 142, 143 and 146.
  • a trained according to FIG. 14 security element 140 has a very high security against counterfeiting, since the complex curved lamellar structures can not be composed of individual, possibly available lamellar films or adjusted without further notice. Furthermore, the continuous light / dark transitions are perceived by a viewer as visually very appealing.
  • the security element of FIG. 14 can also have an optically variable coating which, for. B. between the substrate and the microstructure or on the microstructure is arranged.
  • the security against forgery of such a security element (not shown) is further increased by such a measure.
  • the see-through security elements according to the invention can also contain other microstructures, for example microstructures from a multiplicity of depressions with increased light transmission, instead of venetian blind images whose microstructures are formed by parallel lamellae.
  • the substantially parallel arrangement of the lamellae is replaced at least in areas by a non-parallel arrangement, which is equivalent to an increase in the security against counterfeiting of the security element, since such structures can be technically very difficult to adjust.
  • FIG. 7 shows a see-through security element 70, in which a continuous dark embossing pattern is first applied to a transparent substrate 72.
  • lacquer layer 74 is applied.
  • Embossed in the embossing lacquer layer 74 are a multiplicity of recesses 76 in which the light transmittance of the embossing lacquer layer 74 is increased due to the locally reduced layer thickness.
  • the recesses 76 are arranged so that they viewed together as viewed form a motif that appears and disappears depending on the viewing angle.
  • the characteristic spacing of the recesses is also 1 ⁇ m or more in the designs in which the microstructures comprise a multiplicity of depressions.
  • the lateral dimensions of the depressions are advantageously also about 1 ⁇ m or more.
  • FIGS. 8 (a) and (b) show, by way of example, a number of configurations for depressions 76a, 76b, 76c of different widths and depths as well as depressions 78 having different outline shapes and sizes, which respectively give the embossing lacquer layer a defined increased translucency and therefore for establishing halftone images can be used.
  • Realistic halftone images can generally be generated with only a few gray levels, so that a low level of color Number of different well shapes, sizes and depths is sufficient.
  • microstructures (lamellae or depressions) can be produced as described by embossing, in particular by embossing into a UV-curable embossing lacquer or a thermoplastic lacquer.
  • embossing lacquer soluble dyes but also pigment dyes can be used.
  • printing techniques that are capable of lining up very finely structured opaque and non-opaque areas can also be used to produce the microstructures.
  • the desired effects can be obtained with sufficiently low total thickness with any printing technique capable of producing a layer about 3 ⁇ m to 20 ⁇ m thick with recesses or trenches with diameters between 1 ⁇ m and 30 ⁇ m.
  • micro-gravure printing technology a tool mold is provided whose surface has an arrangement of elevations and depressions in the form of the desired microstructure.
  • the recesses of the tool mold are filled with a curable colored or colorless varnish, and the substrate to be printed is pretreated for a good anchoring of the varnish.
  • the surface of the mold is brought into contact with the carrier, and the paint in contact with the carrier is hardened in the recesses of the mold while being connected to the carrier.
  • the surface of the again removes it from the carrier so that the hardened lacquer associated with the carrier is pulled out of the recesses of the tool mold.
  • the structural elements of the microstructures for example the lamellae of FIGS. 2 to 6 or the depressions of FIGS. 7 and 8, can also be provided in partial regions with an opaque, a reflective or an absorbent coating.
  • FIG. 9 shows a security element 80 with a lamellar structure of a plurality of substantially parallel, transparent lamellae 82, which, as described above, mitange e e of an embossing lacquer layer, a printing layer or a micro-gravure printing layer are formed.
  • the symmetrical lamellar structure 82 is asymmetrically provided with an opaque coating 84, as shown in FIG. In this case, the asymmetric coating z.
  • PVD Physical Vapor Deposition
  • the intended for Schrägbedampfung particle steam then strikes under an oblique, ie not with respect to the substrate surface vertical angle, on the microstructure elements or the substrate surface. Due to the asymmetry of the coating, a viewing through the transparent lamellae 82 is possible from the viewing direction 88, while the opaque coating 84 obstructs the viewing on the lamellae 82 from the viewing direction 86, so that the security element 80 in the partial region shown becomes opaque from the viewing direction 86 appears.
  • suitable arrangement of the lamellae 82 and the coating 84 it is thus possible, for example, to produce a see-through image which becomes visible only when the security element is tilted in the viewing direction 88.
  • Fig.10 shows a microstructure 90 with symmetrical microstructure elements and with a z. B. generated by oblique deposition asymmetric coating 92, in which the microstructure elements, however, more surfaces have different inclination 94, 96, and thus increase the freedom of design for the design of the transparencies.
  • FIG. 12 shows a security element 110 having a microstructure 112 with various structural elements, which are provided in partial regions with so-called moth eye structures 114, which represent effective light traps for the incident light.
  • the features of the microstructure 112 are provided with diffraction gratings which diffract substantial portions of the light incident at a certain angle in directions out of viewing direction.
  • a geometric microstructure with a characteristic element size of 3 ⁇ m to 50 ⁇ m with a diffraction structure with a characteristic element size of about 300 nm to about 1000 nm also makes it possible to realize effective see-through tilting effects.
  • the structures may additionally be provided perpendicularly or obliquely with a reflective layer or with a layer having a refractive index which differs significantly from the structural elements.
  • FIG. 15 Such a see-through security element with an additional coating is shown in FIG.
  • the security element 160 of FIG. 15 has a transparent or translucent material 161, z. B. a plastic film made of PET, applied microstructure 170, which in turn from a plurality of microstructure elements 162 and 163 and an arranged over it optically variable coating with layers 164, 165 and 166 is formed.
  • the microstructure elements 162 and 163 arranged symmetrically with respect to the plane of symmetry 169 form a sawtooth-shaped relief structure.
  • the relief structure can also be taken as a grid structure with a relatively small grid angle ⁇ .
  • the grating angle ⁇ is about 20 °, although even smaller angles up to about 5 ° or larger angles up to about 45 ° are conceivable.
  • the height h of the individual grid lines is approximately 5 ⁇ m.
  • a three-layer optically variable coating is arranged above the microstructure.
  • the individual layers 164, 165 and 166 were deposited by vapor deposition from a direction substantially perpendicular to the substrate surface.
  • the flanks 167 of the relief structure arranged parallel to the vapor deposition direction do not have an optically variable coating.
  • the three-layer coating with color-tilting effect is a metallic / dielectric structure with the following structure.
  • a layer 164 of aluminum is preferably first applied by vapor deposition.
  • the layer serves as a reflector and has a layer thickness of about 10 nm to 100 nm, preferably of about 30 nm.
  • a layer of SiO 2 with a layer thickness of 100 nm to 1000 nm, more preferably with a layer thickness of about 200 nm to 600 nm is usually applied by vapor deposition.
  • the thickness of the SiCh layer determines the color shift effect to be perceived later by the observer for the structure.
  • a semitransparent layer of chromium is deposited over the layer of SiO 2 , which has a layer thickness of about 3 nm to 10 nm.
  • the three-layer structure thus obtained has a color shift effect from green (top view, direction 177) to magenta (oblique viewing angle, direction 178, 179).
  • the embodiment of the see-through security element according to the invention shown in FIG. 15 shows, in a plan view (direction 177), substantially the same color for the observer for the regions of the microstructure 170 provided with the microstructure elements 162 and 163.
  • the security element is tilted from the vertical viewing direction 177 to an oblique viewing direction 178 or 179, the color impression for the areas of the security element 160 provided with the microstructure elements 162 and 163 changes due to the then different
  • the angle between the irradiated light and the interference layer arrangement with the layers 164, 165, 166 present on the micropattern elements 162 and 163, respectively, is clear, wherein the plane 169 forms a sharp boundary between the regions perceived differently colored by the observer with the elements 162 and 16, respectively 163 represents.
  • the security element 160 is extraordinarily tamper-proof by the superimposition of a relief structure and a coating with a color shift effect and the resulting synergistic effects.
  • such an optically variable security element is very appealing to the viewer, so that a security element according to this embodiment has a particularly high recognition value.
  • the see-through security element 120 shown there has a transparent or translucent substrate 122 having a first surface and an opposite second surface, wherein a see-through mask 124 is applied to the first surface as a microstructure.
  • the see-through mask 124 is formed by an opaque layer 126 with translucent openings 128 having a size below 200 microns, preferably having a size of about 5 microns to about 100 microns, wherein the arrangement of the openings a motif in the form of patterns, characters or forms an encoding.
  • a congruent see-through mask 130 is applied to the opposite second surface of the substrate 122 with a certain lateral offset ⁇ of less than 100 ⁇ m, for example of only 10 ⁇ m.
  • the opaque layers of the see-through masks can be produced by known printing methods, by embossing in ink layers, by embossing wells in transparent lacquer and then filling the wells with paint, by metallization / demetalization and preferably by the above-mentioned microtip printing technique according to German patent application 102006029852.7. It is also conceivable in principle that the see-through mask on one side of the substrate z. B. is obtained by a stamping technique, the transparent mask on the other side of the substrate but by a suitable metallization or Demetallmaschines- technology. When demetallizing various laser techniques can be used with advantage, since they can be obtained with high-resolution transparency masks.
  • the transparent masks In order to achieve the required small offset of the transparent masks, they can be applied in particular simultaneously to the opposing surfaces of the substrate.
  • the see-through masks are applied successively, special attention must be paid to the registration of the microstructures, in particular their adaptation to the size of the openings 128. If larger openings 128 are used, the registration is less critical, so that in this case application methods with a larger clearance can be used.
  • an additional coating eg. As an optically variable, semi-transparent thin-film arrangement, to be arranged on or below the see-through masks.
  • the additional coating as well as the transparency mask is structured, so has the same motif, which z. B. can be achieved by demetallization techniques.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un élément (12) de sécurité transparent pour papiers de sécurité, documents de valeur et similaires, qui présente au moins une microstructure dont l'aspect visuel (26, 28) dépend de l'angle d'observation en transparence. Selon l'invention, la ou les microstructures sont formées d'un agencement de plusieurs éléments structurels (24), l'écart caractéristique entre les structures étant de 1 µm ou davantage, l'élément (12) de sécurité transparent ayant une épaisseur totale de 50 µm ou moins.
EP07819023.8A 2006-10-24 2007-10-16 Elément de sécurité transparent doté de microstructures Active EP2091756B1 (fr)

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EP15001325.8A EP2939845B1 (fr) 2006-10-24 2007-10-16 Élément de sécurité transparent à microstructures

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DE102006050047A DE102006050047A1 (de) 2006-10-24 2006-10-24 Durchsichtssicherheitselement mit Mikrostrukturen
PCT/EP2007/008953 WO2008049533A2 (fr) 2006-10-24 2007-10-16 Elément de sécurité transparent doté de microstructures

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US (1) US8534708B2 (fr)
EP (2) EP2091756B1 (fr)
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DE (1) DE102006050047A1 (fr)
RU (1) RU2452627C2 (fr)
WO (1) WO2008049533A2 (fr)

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WO2008049533A2 (fr) 2008-05-02
EP2939845B1 (fr) 2018-05-02
EP2091756B1 (fr) 2015-05-13
US8534708B2 (en) 2013-09-17
EP2939845A2 (fr) 2015-11-04
RU2452627C2 (ru) 2012-06-10
DE102006050047A1 (de) 2008-04-30
US20100194091A1 (en) 2010-08-05
CN101528474A (zh) 2009-09-09
WO2008049533A3 (fr) 2009-01-15
RU2009119034A (ru) 2010-11-27
CN101528474B (zh) 2012-05-23
EP2939845A3 (fr) 2016-04-13

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