EP4049852B1 - Élément de sécurité, support de données et procédé de fabrication - Google Patents

Élément de sécurité, support de données et procédé de fabrication Download PDF

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Publication number
EP4049852B1
EP4049852B1 EP22020067.9A EP22020067A EP4049852B1 EP 4049852 B1 EP4049852 B1 EP 4049852B1 EP 22020067 A EP22020067 A EP 22020067A EP 4049852 B1 EP4049852 B1 EP 4049852B1
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EP
European Patent Office
Prior art keywords
color
security element
visible
luminescent
microstructure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22020067.9A
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German (de)
English (en)
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EP4049852A1 (fr
Inventor
Peter Schiffmann
Inge Altmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP4049852A1 publication Critical patent/EP4049852A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—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
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Definitions

  • the invention relates to a security element for securing valuables, a data carrier with such a security element, and a method for producing such a security element.
  • Data carriers such as valuables or identification documents, but also other valuables, such as branded items, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • security elements for security purposes, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • luminescent substances it is known to use luminescent substances to secure valuables or identification documents. The presence of the luminescent substances can then be checked, for example, using a UV lamp.
  • inkjet printers have become readily available, with which would-be counterfeiters can create impression counterfeits of banknotes that, at first glance, bear a close resemblance to the original.
  • the printing can take place without observation by third parties and without the possibility of tracing back to a specific person.
  • Inkjet fluorescent colors are now relatively easily available, especially through online retail, so that luminescence features can also be recreated using inkjet printers.
  • the document GB 2562262 A discloses a security element according to the preamble of claim 1.
  • the invention is based on the object of providing security elements and valuable documents which, in addition to an attractive appearance, have a high level of security against forgery and are protected in particular against counterfeiting using office printers, such as multi-color inkjet printers.
  • the invention contains a security element according to claim 1.
  • the shape of the first color area can show a visually visible motif within a different colored environment.
  • the feature area shows at least two different luminescence colors.
  • luminescence includes phosphorescence and fluorescence, with the excitation of luminescence using invisible UV radiation or IR radiation can occur.
  • the luminescent substances are preferably transparent in the visible spectral range.
  • a homogeneous appearance when viewed with the naked eye means in particular that the viewer cannot see any structures from a normal viewing distance of 25 cm or more, but that the first color area creates the impression of a uniformly printed area.
  • the color of the first color range of the feature range is uniform at least in some areas; the first color range preferably even shows only a single, uniform visible color.
  • At least two luminescent substances of the second color range which produce two different luminescent colors, lie completely within a region of the first color range with a uniform visible color.
  • the luminescence colors of the feature area generated by excitation preferably differ from the respective uniform visible colors of the feature area, in particular they differ from this in the case of a single uniform visible color.
  • the second color area advantageously has two or more luminescence areas which are designed in the form of patterns, characters or codes and which each show one of the different luminescence colors under UV or IR excitation light.
  • the second color area may be located entirely within the feature area and cover only a portion of the feature area. However, it is also possible for the second color range to completely cover the feature range and/or for the second color range to also lie partially outside the feature range. In In an advantageous embodiment, the second color range lies completely within the first color range.
  • the microstructure elements have two or more different colors, which produce the perceived color impression for the viewer from the normal viewing distance through color mixing, in particular subtractive color mixing.
  • a background color for example the color of the carrier on which the microstructure elements are applied, can also contribute to the mixed color.
  • this background color is often white, but it can also be provided by a colored underprint layer.
  • the background color can be present in particular in spaces between the microstructure elements and/or in recesses in the microstructure elements and contribute to the mixed color.
  • the different colors of the microstructure elements in the CIELab system have a color difference ⁇ E of at least 4.0, preferably at least 6.0.
  • the color difference ⁇ E is a measure of the perceived color difference and is constructed in such a way that it is essentially the same distance for all colors that occur.
  • the microstructure elements of the first color range can be arranged adjacent to one another or at a distance from one another.
  • the microstructure elements can be shown in positive form in the form of geometric symbols, Letters and/or numbers and/or in negative representation as a surface with recesses in the form of geometric symbols, letters and/or numbers.
  • line fragments, squares, triangles or other polygons, each with or without filling come into consideration as geometric symbols.
  • the microstructure elements at least partially accommodate geometric elements that are visible to the naked eye elsewhere in the security element in order to establish a connection between the various elements of the security element. Such a connection also makes it easier to recognize or identify the content of information encoded by the microstructure.
  • the characteristic dimensions of the microstructure elements are given, for example, by the diameter of the geometric symbols or the line thickness of letters or numbers. In negative representations, the distance between adjacent recesses forms a characteristic dimension of the microstructure elements. Regardless of the specific design of the microstructure arrangement, the only important thing in the present case is that the microstructure elements cannot be recognized as such with the naked eye due to their small dimensions from the normal viewing distance of 25 cm or more, but that the microstructure arrangement is due to the color mixing of the element colors like a fine print grid is perceived as a homogeneous surface.
  • the microstructure elements contain a first group of microstructure elements of a first color in a negative representation and a second group of microstructure elements of a second, different color in a positive representation, the microstructure elements of the second group are arranged in the recesses of the first group of microstructure elements.
  • the luminescent substances of the second color range are present at least in some areas in a luminescent layer arranged above and/or below the visually visible printing inks.
  • the luminescent substances of the second color range are present in a luminescence layer arranged below the visually visible printing inks and the visually visible printing inks of the first color range contain a UV blocker in some areas, which prevents UV excitation at least in a partial range of the UV spectrum 200 nm and 400 nm reduced or prevented.
  • the first and second color ranges are overprinted with a line structure with a non-luminescent, visually visible color, the color of which differs from the uniform color or colors of the first color range.
  • the line structure preferably accommodates geometric shapes that can be seen with the naked eye elsewhere in the security element, in particular the outline shape of a luminescent or non-luminescent partial area of the feature area. With the additional line structure you can Any visible color differences, gloss differences and/or registration fluctuations of the visually visible printing inks are masked.
  • the at least two different macroscopic luminescence areas have a different colored luminescent outer contour, which corresponds in color to the other luminescence color or a mixed color of the two luminescence colors.
  • the microstructure arrangement is advantageously arranged on a transparent or opaque carrier, in particular on a transfer film element.
  • the microstructure arrangement can in particular be arranged directly on the carrier, in particular printed onto the carrier.
  • the security element is advantageously a security thread, in particular a window security thread or a pendulum security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
  • the security element can contain a carrier film or be present without a carrier film.
  • the invention also contains a method for producing a security element of the type described according to claim 14.
  • the microstructure arrangement and/or the luminescent substances are advantageously applied in offset printing, letterpress printing, indirect letterpress printing, gravure printing or in a digital printing process such as ink-jet printing or laser printing process.
  • the second color range even shows only a single uniform luminescence color.
  • the uniform luminescence colors of the feature area generated upon excitation, or the only uniform luminescence color advantageously differ from the colors of the feature area that are visible in visible light.
  • the first color range advantageously has two or more color ranges, which are designed in the form of patterns, characters or a coding and which each show one of the different visible colors in visible light.
  • the microstructure elements have two or more different luminescent colors, which produce the perceived color impression for the viewer from the normal viewing distance through color mixing, in particular additive color mixing and absorption of the emission color by the visually visible colors.
  • a luminescent background color can also contribute to the mixed color. It is advantageously provided that the different luminescence colors of the microstructure elements in the CIELab system have a color difference ⁇ E of at least 4.0, preferably of at least 6.0.
  • the microstructure elements of the second color range can be arranged adjacent to one another or at a distance from one another.
  • the microstructure elements can be designed in the positive representation in the form of geometric symbols, letters and/or numbers and/or in the negative representation as a surface with recesses in the form of geometric symbols, letters and/or numbers.
  • line fragments, squares, triangles or other polygons, each with or without filling come into consideration as geometric symbols.
  • the microstructure elements at least partially accommodate geometric elements that are visible to the naked eye elsewhere in the security element in order to establish a connection between the various elements of the security element. Such a connection also makes it easier to recognize or identify the content of information encoded by the microstructure.
  • the characteristic dimensions of the microstructure elements are given, for example, by the diameter of the geometric symbols or the line thickness of letters or numbers. In negative representations, the distance between adjacent recesses forms a characteristic dimension of the microstructure elements. Regardless of the specific design of the microstructure arrangement, the only important thing in the present case is that the microstructure elements cannot be seen with the naked eye due to their small dimensions from the normal viewing distance of 25 cm or more, but that the microstructure arrangement is created by the additive color mixing of the luminescent colors of the elements like a fine print screen is perceived as a homogeneous surface.
  • the microstructure elements contain a first group of microstructure elements of a first luminescent color in a negative representation and a second group of microstructure elements of a second, different luminescence color in a positive representation, the microstructure elements of the second group being arranged in the recesses of the first group of microstructure elements.
  • the luminescent substances of the second color range are mixed at least in areas with the visually visible printing inks of the first color range and thereby form printing inks that are both visually visible and luminescent.
  • the luminescent substances of the second color range can be present at least in some areas in a luminescent layer arranged above and/or below the visually visible printing inks.
  • the invention also contains a data carrier with a security element of the type described.
  • the data carrier can in particular be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a voucher , a check, a seal, a tax stamp, a high-quality admission ticket, but also an identification card, such as a credit card, a bank card, a cash payment card, an authorization card, an ID card or a passport personalization page.
  • a banknote in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a voucher , a check, a seal, a tax stamp, a high-quality admission ticket
  • an identification card such as a credit card, a bank card, a cash payment card, an authorization card, an ID card or a passport personalization page.
  • the security element can represent a separate security element, for example a film element, which is located at a desired location on a Disk is arranged.
  • the security element can also form an integral part of the data carrier itself, for example by means of an imprint that is applied to a substrate of the data carrier.
  • FIG. 1 shows a schematic representation of a banknote 10, which has a substrate made of paper, plastic or a hybrid substrate a combination of paper and plastic layers.
  • the banknote 10 is provided with three security elements 12, 16 and 18 according to exemplary embodiments of the invention, the first security element representing a security thread 12 which emerges from certain window areas 14 on the surface of the banknote 10, while in the intermediate areas inside the banknote 10 Banknote 10 is embedded.
  • the second security element 16 is formed by a portion of the banknote 10, in which the banknote paper is provided with an imprint that has the various special color areas described in more detail below.
  • the third security element 18 is formed by a portion of the banknote 10, in which the banknote paper is provided with a motif-shaped imprint, namely an imprint with a recess in the form of the value number "10" of the banknote. This print also has the special color ranges described below.
  • the invention does not apply to the in Fig. 1 security elements shown by way of example, but in particular also includes glued-on transfer elements of any shape with or without their own carrier film.
  • the security element can also be designed in the form of a cover film which is arranged over a window area or a continuous opening of the banknote.
  • the invention can be used for all types of security elements, for example labels on goods and packaging or for securing documents, ID cards, passports, credit cards, health cards and the like.
  • Figure 2 shows a top view of a security element 20 according to a first exemplary embodiment of the invention, where Fig. 2(a) the appearance of the security element in visible light and Fig. 2(b) represents the appearance of the security element under UV light.
  • the security element 20 When viewed in visible light, the security element 20 appears to the naked eye from a usual viewing distance of approximately 30 cm as a homogeneous surface 22 with a uniform color, for example red. As in detail D of the Fig. 2(a) illustrated, the surface that appears monochromatic is actually formed from a large number of small microstructure elements 24, 26, all of which have a dimension below the resolution limit of the human eye and are therefore not visible to the naked eye.
  • the microstructure elements are formed by 80 ⁇ m ⁇ 80 ⁇ m squares 24, 26, each of which has a recess 28 in the form of letters or numbers, as in Fig. 2(a) illustrated by the letters “A” and “B” respectively.
  • the squares 24 are printed directly onto the banknote paper of a banknote 10 with a printing ink with yellow color pigments, the squares 26 with a printing ink with magenta color pigments.
  • the background underneath the microstructures, for example the white banknote paper appears in the letter-shaped recesses 28.
  • the different colored squares 24, 26 produce the mixed color red of the surface 22 through subtractive color mixing, the color saturation of the red color impression being able to be adjusted by the size of the recesses 28.
  • Figure 2 shows the same size Squares 24, 26, but the microstructures can also have different sizes, for example in order to produce a mixed color of a desired color.
  • the surface 22, which appears homogeneously monochrome from a normal viewing distance, actually consists of the different colored squares 24, 26 with their letter-shaped recesses 28 can be determined with a magnifying glass or a microscope and represents an authenticity feature of the security element 20 that is difficult to reproduce.
  • the security element 20 When viewed under UV light, the security element 20 shows the in Fig. 2(b) Appearance shown with two motif-shaped luminescence areas 30, 32 located within the surface 22, which glow with different luminescence colors, for example orange and green. Both luminescence colors are different from the visible red color of the surface 22, so that the luminescence areas 30, 32 appear in a clearly contrasting manner even with the combination lighting of visible and UV light that is usually present.
  • the luminescence areas 30, 32 are not recognizable; the same homogeneous, red appearance is visible in their surface areas as in the rest of the surface 22, so that the position of the luminescence areas in Fig. 2(a) is only indicated by dashed lines.
  • the homogeneous appearing surface 22 forms the above-mentioned first color area and at the same time the feature area that is congruent with the first color area, and the luminescence areas 30, 32 together form the above-mentioned second color area, which overlaps the feature area.
  • the second color area is the second color area arranged completely within the feature area.
  • the microscopic microstructure elements 24, 26 and the macroscopic luminescence regions 30, 32 can advantageously be coordinated with one another.
  • the recesses 28 of the microstructure elements 24, 26 can be designed alternately in the form of the numbers "1" and "0" of the value number "10" of the banknote, and the two luminescent areas 30, 32 can also be in the form of the numbers "1” or "0” may be applied to represent the value under UV lighting.
  • Figure 3 shows in (a) schematically the structure of an unclaimed security element 20 in cross section, which Figures 3(b) and 3(c) illustrate the associated appearance of the security element when viewed in visible light or in UV light in top view.
  • the security element 20 has a substrate 36, which in particular represents the substrate of the document of value onto which the security element 20 is applied, for example printed.
  • the substrate 36 it is also possible for the substrate 36 to be a substrate film of a separate security element, which is applied, for example glued, to a desired target substrate after its production.
  • the security element 20 can also have been produced on a transfer carrier substrate, transferred to the target substrate and the transfer carrier substrate then peeled off.
  • the surface 22 is formed by a sequence of microstructure elements 24, 26, which are formed, for example, by printing inks with yellow or magenta color pigments.
  • the microstructure elements can also contain recesses, as in Fig. 2 shown, but for the sake of easier presentation Fig. 3 are not shown.
  • the microstructure elements can be applied adjacent to one another or at a small distance next to one another. Due to the small dimensions of the microstructure elements 24, 26, the surface 22 appears from a normal viewing distance with the uniform subtractive mixed color of the yellow and magenta microstructure elements, i.e. in a uniform red color.
  • the printing inks of the microstructure elements 24, 26 in the first luminescence regions 30 are mixed with a first luminescent substance 40, which is transparent in the visible spectral range and therefore does not influence the visual colors of the microstructure elements.
  • a second, visible transparent luminescent substance 42 is mixed into the printing inks of the microstructure elements 24, 26.
  • the luminescent colors of the first and second luminescent substances 40, 42 differ from one another and also differ from the mixed color of the surface 22.
  • the non-luminescent areas 34 the printing colors of the microstructure elements 24, 26 are present without the admixture of luminescent substances.
  • the luminescence areas 30, 32 are formed macroscopically in the form of characters or patterns, such as the coat of arms motif or the star motif Fig. 2(b) .
  • the luminescence regions have such large dimensions that, in contrast to the microstructure elements 24, 26, they can be seen with the naked eye from a normal viewing distance, and therefore each contain a large number of microstructure elements 24, 26.
  • the Luminescence areas 30, 32 can be continuous or gridded, i.e. formed by small luminescent grid elements that cannot be resolved with the naked eye, which together form the desired luminescence motif from a normal viewing distance.
  • Six different printing colors are therefore used to print the surface 22, namely the visually visible printing ink with the first color (yellow) without the addition of luminescent substance, the visually visible printing ink of the first color with the addition of the first luminescent substance 40 or the second luminescent substance 42 , the visually visible printing ink of the second color (magenta) without admixture of luminescent substance and the visually visible printing ink of the second color with admixture of the first luminescent substance 40 or the second luminescent substance 42.
  • the transparent luminescent substances do not appear when viewed in the visible spectral range.
  • the sequence of the different colored microstructure elements 24, 26 can be seen with a magnifying glass; with the naked eye, the color effects of the microstructure elements 24, 26 mix to form the uniform mixed color of the surface 22.
  • the luminescent areas 30, 32 When viewed under UV light, the luminescent areas 30, 32 glow in the corresponding luminescent colors, as shown in Fig. 3(c) illustrated. In the case of a combination illumination of visible light and UV light, in addition to the luminescent colors, the colors of the microstructure elements 24, 26 also appear, so that the luminescent areas 30, 32 appear to the naked eye against the background of the mixed color of the surface 22.
  • Figure 4 shows a modification of the design that falls under the main claim Fig. 3 , in which the luminescent substances 40, 42 are not mixed with the printing inks of the microstructure elements 24, 26, but are printed separately as visually transparent, luminescent printing inks 50, 52 on the printing layer with the microstructure elements 24, 26.
  • the macroscopic luminescence regions 30, 32 fit to the microstructure elements 24, 26.
  • the luminescence areas can be either continuous (illustrated on the luminescence area 30) or rasterized (illustrated on the luminescence area 32), i.e. formed by small luminescent grid elements 38 that cannot be resolved with the naked eye, which form the desired luminescence motif from the normal viewing distance in the manner of a raster image generate.
  • the printing inks 50, 52 can be printed onto the microstructure elements 24, 26, as in Fig. 4 illustrated, or below the microstructure elements 24, 26 are available. In the latter case, the light emitted after UV excitation passes through the printing inks of the microstructure elements 24, 26, so that the perceptible luminescence colors result from the emitted luminescence colors and the absorption properties of the printing inks of the microstructure elements. It goes without saying that the luminescent printing inks 50, 52 can also be present partly above and partly below the microstructure elements 24, 26. The technological challenge of this design lies in particular in the fit of the microstructure elements 24, 26 to produce the homogeneously monochromatic surface 22.
  • the visually invisible luminescent printing ink is printed more or less well registered in the area of the first visually visible microstructure color, for example yellow, and for the second luminescent area in the area of the second visually visible microstructure, for example magenta.
  • the visually invisible luminescent printing ink is printed more or less well registered in the area of the first visually visible microstructure color, for example yellow, and for the second luminescent area in the area of the second visually visible microstructure, for example magenta.
  • Figure 5 shows another unclaimed modification of the design of the Fig. 3 , in which one of the printing inks, in the exemplary embodiment the printing ink for the microstructure elements 24 ', is formulated to be opaque and these microstructure elements 24' are printed on previously applied microstructure elements 26'.
  • the opaque printing ink of the microstructures 24' partially covers the microstructures 26' arranged underneath, so that essentially only the opaque printing ink appears at the overprinted areas.
  • the printing ink provided with a luminescent substance 40 or 42 also has an opaque effect, only the luminescent substance of the opaque printing ink is excited to emit in the overprinted areas in the luminescent areas 30 and 32, respectively. Accordingly, the result is essentially an appearance as in Fig. 3(b) in visible light and an appearance like in Fig. 3(c) in UV light.
  • Figure 6 shows another modification of the design that falls under the main claim Fig. 3 , in which there is a continuous luminescent layer 60 on the substrate 36, which takes up the entire surface 22 and contains a first luminescent substance 40 in some areas and a second luminescent substance 42 in some areas.
  • the microstructure elements 24, 26 are printed onto the luminescent layer 60, with a UV blocker 62 being mixed into the printing inks of the microstructure elements 24, 26 in the non-luminescent areas 34, which prevents UV excitation of the luminescent substances 40, 42 at these points.
  • the luminescent substances 40, 42 can be excited through the visible printing inks and the luminescence emission, filtered through the printing inks of the microstructure elements 24, 26, can be observed.
  • the overall result is essentially an appearance as in Fig. 3(b) in visible light and an appearance like in Fig. 3(c) in UV light.
  • areas of the luminescent layer 60 without overprinting by visually visible printing inks or in recesses of the visually visible printing inks there is no filtering of the emission color.
  • IR-stimulable luminescent substances are used, corresponding NIR absorbers must be used instead of UV blockers in order to achieve the desired prevention of IR excitation.
  • FIG. 7 shows schematically the structure of an unclaimed security element 20 in cross section and in (b) and (c) the associated appearance when viewed in visible light or in UV light in top view.
  • surface 22 is referenced Fig. 7(a) formed by a sequence of microstructure elements 24, 26, which are applied to the substrate 36 with small gaps 70.
  • the dimensions of the gaps 70 are of the same order of magnitude as the dimensions of the microstructure elements 24, 26.
  • the gaps 70 are filled with visually transparent, luminescent printing inks 50, 52, which are filled with first and second luminescent substances 40, 42 are provided.
  • the luminescent printing inks 50, 52 arranged there represent small printing dots or printing elements of a raster image, and form the desired motifs of the luminescent areas from a normal viewing distance, without the raster itself being resolvable with the naked eye.
  • the luminescent areas 30, 32 When viewed under UV light, the luminescent areas 30, 32 light up in the corresponding luminescent colors, as shown in Fig. 7(c) illustrated, whereby the luminescent spaces produce the desired luminescence motifs in the manner of raster images as described.
  • inventions described can also be used Figures 2 to 7 are possible and that more than two different visually visible colors and more than two different luminescent colors can be used to further complicate reenactment.
  • the luminescent substances can differ from one another in particular in the excitation spectrum, the emission spectrum and the afterglow duration.
  • Figure 8 illustrates some advantageous embodiments for dividing the visually homogeneous surface into microstructure elements in the form of various characters and symbols. An enlarged section of the area of the first color area with the microstructure elements is shown schematically. To the naked eye, the surface appears homogeneous from a normal viewing distance, as already explained above.
  • the seemingly homogeneous surface 80 contains microstructure elements 82 of a first color, and microstructure elements 84 of a second, different color.
  • the microstructure elements are each formed by letters of a specific font in the same font size and printed on a white substrate base 86.
  • the line width of the letters is 10 ⁇ m to 30 ⁇ m and the letter height is 30 ⁇ m to 100 ⁇ m.
  • the letters of the different colored microstructure elements 82, 84 form the word "TALER" as a hidden coding that is only visible with a magnifying glass.
  • the color of the initial letter “T” changes constantly in order to create the most uniform color impression possible of the surface 80 from the normal viewing distance.
  • the color of the surface 80 results from the two different colors of the microstructure elements 82, 84 and the white color of the substrate background 86.
  • the color of the first letters of each line also advantageously changes from line to line in order to avoid monochrome edge lines.
  • the exemplary embodiment of the Fig. 8(b) shows a modification of the design Fig. 8(a) , in which the readability of the microwriting formed by the microstructure elements is increased by adding a star-shaped separation symbol 88.
  • the separator symbol 88 preferably has essentially the same area coverage as the letter symbols so as not to introduce any noticeable disturbances in the character string.
  • the addition of the separation symbol 88 results in a further advantage that the color of the initial letter "T" can now always be the same, thereby increasing the readability of the coded word under a magnifying glass. It is understood that instead of the in Fig. 8(b) Others also used Stern symbols, and that multiple separation symbols can also be used.
  • the surface is 80, as in the design of the Fig. 2 , formed by a sequence of square microstructure elements 92, 94 in two different colors, the squares each containing a centered recess 98 in the form of the letters of the coded word "TALER".
  • the mixed color of the surface 80 results from the colors of the microstructure elements 92, 94 and the white color of the substrate background in the recesses 98.
  • the homogeneous appearing surface 80 is formed on the one hand by a negative microstructure 102 of a first color and on the other hand by a positive microstructure 104 of a second color.
  • the negative microstructure 102 contains recesses in the form of the letters of the word "TALER", while the positive microstructure 104 congruently contains the same letters in positive representation, which are each arranged in the recesses of the negative microstructure 102.
  • the unprinted portion of the substrate is further reduced by such a combination of two positive/negative microstructures and high color strength is achieved.
  • the first color area 110 of a security element can also contain several partial areas 112, 114 in which the homogeneously appearing surface 80 each appears with a different mixed color.
  • a negative microstructure 102 of a first color and a positive microstructure 104 of a second color and in a second subregion 114 a negative microstructure 106 of a third color, combined with the positive microstructure 104 of the second color ( or a fourth color).
  • the surface 80 then appears homogeneous and with a uniform color in both the partial area 112 and the partial area 114, the uniform color in the first partial area 114 being due to subtractive color mixing of the first and second colors, and the uniform color in the second partial area 116 by subtractive color mixing of the third and second colors (or the third and fourth colors).
  • the color of the positive microstructure 104 can also change from the first to the second subregion.
  • the partial areas of different colors can be spaced apart or directly adjacent to one another. More than two partial areas with different mixed colors can also be provided.
  • the mixed colors of these several partial areas are coordinated with one another in such a way that, from the normal viewing distance, they appear as a quasi-continuous color gradient between two areas with fixed but different mixed colors.
  • Figure 9 shows a further development of the security element 20 Figures 2 and 3 , in which the first color area 22 and the second color area 30, 32 are overprinted with a line structure 120, the color of which differs from the uniform red mixed color of the first color area.
  • the structure 120 can also be created by leaving out the visually visible colors.
  • the line structure 120 can be designed in any way but preferably takes up a geometric shape present in the partial areas 30, 32 or 34, in the exemplary embodiment approximately the star shape of the second luminescence area 32.
  • the additional line structure 120 masks any noticeable color differences, gloss differences and/or registration fluctuations between the partial areas 30, 32 or 34, which can remain in some cases despite the basic color sameness and the visual transparency of the luminescent substances.
  • the line structure 120 is printed with a visually visible, non-luminescent color so that when viewed in visible light it has the masking effect described, as in Fig. 9(a) illustrated. When viewed under UV light, the line structure 120 appears darker in the luminescence areas 30, 32 because it reduces the emission of the luminescent substances there. In Fig. 9(b) To illustrate this effect, this effect is shown with an exaggerated line thickness of the line structure 120 in the case of complete blocking of the luminescence emission.
  • Figures 10 and 11 illustrate another design of a security element 200, where Fig. 10(a) the appearance of the security element 200 in visible light and Fig. 10(b) represents the appearance of the security element under UV light.
  • Figure 11 shows schematically the structure of the security element 200 in cross section along the line XI-XI of Fig. 10(a) .
  • the security element 200 appears in visible light with two or more different colors in an area 202, where in Fig. 10(a) To illustrate, two color areas 204, 206 of different colors are shown, which are separated by an unprinted intermediate area 208.
  • the appearance of the security element 200 changes, so that when viewed with the naked eye from a usual viewing distance of approximately 30 cm, both color areas 204, 206 now glow in the same luminescent color, as in Fig. 10(b) illustrated.
  • the two motifs 204 (coat of arms and star) can appear red against a blue background 206 in visible light, while under UV light both the two motifs 204 and the background 206 appear with yellow luminescence.
  • the monochrome luminescent surface is actually composed of a plurality of small luminescent microstructure elements 224, 226, which have a dimension below the resolution limit of the human eye and are therefore not visible to the naked eye.
  • the single-color luminescent surface 202 is formed by a negative microstructure 224 with a first luminescent color, for example red, and a positive microstructure 226 of a second luminescent color, for example green, which together produce the yellow luminescent color of the surface 202 through additive color mixing.
  • the negative microstructure 224 contains the letters of the encoded word "TALER" as recesses, while the positive microstructure 226, congruent with the recesses of the negative microstructure 224, contains the same letters in positive representation.
  • the security element 200 has a substrate 36, which, as in the previously described designs, can be, for example, a substrate film of the security element itself or the substrate of a document of value on which the security element is applied.
  • the two different colored color areas 204, 206 are printed on the substrate 36 using visually visible printing inks.
  • a luminescent layer 220 which is formed by the above-mentioned sequence of elements of the negative microstructure 224 and the positive microstructure 226, is applied to both color areas.
  • the negative microstructure 224 contains a first luminescent substance 214, which luminesces red after UV excitation
  • the positive microstructure 226 contains a second luminescent substance 216, which luminesces green after UV excitation. Due to the small dimensions of the microstructure elements 224, 226, the surface 202 appears with the uniform additive mixed color yellow from a normal viewing distance in UV light. With a magnifying glass or a microscope, the composite character of the area 202 can be proven as an authenticity feature.
  • microstructure elements 224, 226 can also be applied in other arrangements, in particular in one of the above with reference to Figures 8(a) to 8(e) described arrangements.
  • the luminescent substances 214, 216 can also each be mixed with a visually visible printing ink, as shown in FIG Fig. 12 illustrated.
  • the luminescent substances 214 and 216 are each mixed with a blue printing ink in the color areas 206, and the two printing inks 234, 236 thus obtained are printed alternately in the form of the microstructure elements 224, 226 in order to produce the background area 206.
  • the luminescent substances 214 and 216 are each mixed with a red printing ink, and the two printing inks 244, 246 thus obtained are printed alternately in the form of the microstructure elements 224, 226 in order to produce the red motif areas 204.
  • the result of this variant also results in the appearance of the security element 200 described above.
  • the exemplary embodiments were each described with reference to UV light as excitation radiation, but it is understood that luminescent substances that can be stimulated to luminescence by IR light can also be used in the same way.

Landscapes

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

Claims (15)

  1. Élément de sécurité (12), destiné à sécuriser des objets de valeur (10), l'élément de sécurité comportant
    - une zone de caractéristiques, qui contient une première zone colorée (20) qui est constituée d'encres d'impression visuellement perceptibles et
    - une deuxième zone colorée (30, 32), qui est constituée de substances luminescentes non visibles en l'absence d'excitation et qui chevauche au moins partiellement la zone de caractéristiques,
    - à l'observation à l'œil nu à la lumière visible, la première zone colorée de la zone de caractéristiques montrant une apparence homogène, dans une couleur uniformément visible et
    - à l'observation sous une lumière d'excitation par UV ou par IR, la zone de caractéristiques montrant au moins deux couleurs luminescentes différentes, caractérisé en ce que
    - la première zone colorée comprend un ensemble de microstructures composée d'éléments microstructuraux de différentes couleurs, qui font preuve d'une dimension caractéristique en-dessous de la limite de résolution de l'oeil humain et dont chacun comporte l'une d'au moins deux différentes couleurs et par mélange de couleurs, qui génèrent des couleurs uniformes, visible à l'œil nu et en ce que
    - les substances luminescentes de la deuxième zone colorée sont présentes au moins par endroits dans une couche luminescente, placée au-dessus et / ou en-dessous des encres d'impression visuellement perceptibles.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce qu'au moins deux substances luminescentes de la deuxième zone colorée se situent complètement dans une zone de la première zone colorée d'une couleur uniformément visible.
  3. Élément de sécurité selon la revendication 1 ou 2, caractérisé en ce qu'à l'observation à l'œil nu à la lumière visible, la zone de caractéristiques montre une apparence homogène, avec une unique couleur uniformément visible.
  4. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce que les couleurs luminescentes de la zone de caractéristiques se différencient des couleurs respectivement uniformément visibles, notamment de l'unique couleur uniformément visible.
  5. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que la deuxième zone colorée comporte deux zones luminescentes ou plus, qui sont constituées sous la forme de motifs, de caractères ou de codages et qui sous une lumière d'excitation par UV ou IR montrent chacune l'une des différentes couleurs luminescentes, la deuxième zone colorée se situant de préférence complètement à l'intérieur de la première zone colorée.
  6. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que dans le système CIELab, les différentes couleurs des éléments microstructuraux font preuve d'une différence de couleur ΔE d'au moins 4,0, de préférence d'au moins 6,0.
  7. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que les éléments microstructuraux sont placés en étant adjacents les uns aux autres ou en ce que les éléments microstructuraux sont placés en étant espacés les uns des autres.
  8. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce qu'en contraste positif, les éléments microstructuraux sont constitués en forme de symboles géométriques, de lettres et / ou de chiffres et / en contraste négatif, ils sont représentés en tant que surface dotée d'échancrures sous la forme de symboles géométriques, de lettres et / ou de chiffres.
  9. Élément de sécurité selon la revendication 8, caractérisé en ce que les éléments microstructuraux comprennent un premier groupe d'éléments microstructuraux d'une première couleur en contraste négatif et un deuxième groupe d'éléments microstructuraux d'une deuxième couleur différente en contraste positif, les éléments microstructuraux du deuxième groupe étant placés dans les échancrures du premier groupe d'éléments microstructuraux.
  10. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce que les substances luminescentes de la deuxième zone colorée sont présentes dans une couche luminescente placée en-dessous des encres d'impression visuellement perceptibles et en ce que les encres d'impression visuellement perceptibles de la première zone colorée comprennent par endroits un bloqueur d'UV, qui réduit ou empêche une excitation par UV au moins dans une gamme partielle du spectre UV comprise entre 200 nm et 400 nm.
  11. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce que la première et la deuxième zones colorées sont surimprimées d'une structure linéaire d'une couleur non luminescente, visuellement perceptible, dont la couleur se différencie de la ou des couleurs uniformes de la première zone colorée.
  12. Élément de sécurité selon au moins l'une quelconque des revendications 1 à 11, caractérisé en ce que l'ensemble de microstructures est placé sur un support transparent ou opaque, notamment sur un élément de film de transfert.
  13. Support de données, pourvu d'un élément de sécurité selon l'une quelconque des revendications 1 à 12, le support de données étant notamment un document de valeur ou une carte d'identité.
  14. Procédé, destiné à fabriquer un élément de sécurité selon l'une quelconque des revendications 1 à 12, lors duquel
    - l'on génère une zone de caractéristiques pourvue d'une première zone colorée, laquelle est constituée d'encres d'impression visuellement perceptibles,
    - l'on constitue une deuxième zone colorée de substances luminescentes non visibles en l'absence d'excitation, de telle sorte que la deuxième zone colorée chevauche au moins partiellement la zone de caractéristiques,
    - à l'observation à l'œil nu à la lumière visible, la première zone colorée de la zone de caractéristiques montrant une apparence homogène, avec une couleur uniformément visible,
    - à l'observation sous une lumière d'excitation par UV ou par IR, la zone de caractéristiques montrant au moins deux couleurs luminescentes différentes,
    - la première zone colorée étant constituée d'un ensemble de microstructures d'éléments microstructuraux de différentes couleurs, qui font preuve d'une dimension caractéristique en-dessous de la limite de résolution de l'œil humain et dont chacun comporte l'une d'au moins deux différentes couleurs et par mélange de couleurs, qui génèrent des couleurs uniformes, visible à l'œil nu et
    - l'on constitue la deuxième zone colorée en des substances luminescentes qui se présentent au moins par endroits dans une couche luminescente placée au-dessus et / ou au-dessous des encres d'impression visuellement perceptibles.
  15. Procédé selon la revendication 14, caractérisé en ce que l'on applique l'ensemble de microstructures et / ou substances luminescentes par impression offset, par impression en relief, par impression en relief indirecte, par héliogravure ou par un procédé d'impression numérique, comme l'impression au jet d'encre ou un procédé d'impression au laser.
EP22020067.9A 2021-02-25 2022-02-18 Élément de sécurité, support de données et procédé de fabrication Active EP4049852B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021001019.1A DE102021001019A1 (de) 2021-02-25 2021-02-25 Sicherheitselement, Datenträger und Herstellungsverfahren

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EP4049852A1 EP4049852A1 (fr) 2022-08-31
EP4049852B1 true EP4049852B1 (fr) 2024-01-31

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029852A1 (de) 2006-06-27 2008-01-03 Giesecke & Devrient Gmbh Verfahren zum Aufbringen einer Mikrostruktur, Werkzeugform und Gegenstand mit Mikrostruktur
GB201003397D0 (en) 2010-03-01 2010-04-14 Rue De Int Ltd Moire magnification security device
JP5699313B2 (ja) 2010-08-09 2015-04-08 大日本印刷株式会社 発光媒体
DE102014217002A1 (de) * 2014-08-26 2016-03-03 Bundesdruckerei Gmbh Farbige Lasergravur
DE102014117877A1 (de) 2014-12-04 2016-06-23 Leonhard Kurz Stiftung & Co. Kg Sicherheitselement
GB2549215B (en) 2015-06-10 2018-07-25 De La Rue Int Ltd Security devices and methods of manufacture thereof
FR3046109B1 (fr) 2015-12-29 2022-02-18 Arjowiggins Security Article securise comportant une image combinee et/ou une trame de revelation
GB2562262B (en) * 2017-05-10 2019-12-11 De La Rue Int Ltd Security devices and methods for their manufacture

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EP4049852A1 (fr) 2022-08-31

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