EP3825141B1 - Element luminescent avec zone de motif luminescente - Google Patents

Element luminescent avec zone de motif luminescente Download PDF

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Publication number
EP3825141B1
EP3825141B1 EP20020514.4A EP20020514A EP3825141B1 EP 3825141 B1 EP3825141 B1 EP 3825141B1 EP 20020514 A EP20020514 A EP 20020514A EP 3825141 B1 EP3825141 B1 EP 3825141B1
Authority
EP
European Patent Office
Prior art keywords
luminescence
luminescent
region
ink
motif
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
EP20020514.4A
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German (de)
English (en)
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EP3825141A3 (fr
EP3825141A2 (fr
Inventor
Peter Schiffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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Publication of EP3825141A2 publication Critical patent/EP3825141A2/fr
Publication of EP3825141A3 publication Critical patent/EP3825141A3/fr
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    • 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
    • B42D25/351—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
    • B42D25/30—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 luminescence element with a luminescence motif area. It relates in particular to a luminescent element with a normal motif area whose colored normal motif can be recognized in the visible spectral range without aids, and with a luminescent motif area overlapping the normal motif area whose colored luminescent motif can only be recognized after excitation with UV or IR radiation.
  • the invention also relates to a method for manufacturing such an element.
  • Data carriers such as value or ID documents, but also other valuables, such as branded items, are often provided with features for security purposes, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction.
  • luminescent and in particular fluorescent substances to protect valuable or identity documents.
  • the presence of the luminescent substances can then be checked, for example, with the aid of a UV lamp.
  • Fluorescence features have recently been used more and more because of the availability of chemically stable fluorescent pigments and the parallel availability of inexpensive, small UV-LED detectors. Multicolored and in particular photorealistic fluorescent prints are perceived as particularly attractive when it comes to authenticity assurance.
  • EP 3 513 984 A1 a luminescent area and a normal area are provided in the same color tone, which complement each other to form an overall motif.
  • the invention is based on the object of specifying a forgery-proof luminescence element of the type mentioned at the outset with an attractive appearance and high security against forgery, which can nevertheless be easily checked by the user.
  • the luminescence element comprises a normal motif area, the colored normal motif of which can be recognized in the visible spectral range without aids, and a luminescent motif area overlapping the normal motif area, the colored luminescent motif of which can only be recognized after excitation with UV or IR radiation.
  • the luminescence element provides for the luminescence motif area to contain at least one color area which luminesces in a uniform color tone after excitation by UV or IR radiation or UV and IR radiation.
  • said color range contains a first partial color range, which lies outside the overlapping area with the normal motif area, and contains a second partial color range, which lies within the overlapping area with the normal motif area.
  • the first partial color area contains one or more luminescent colors which produce the specified uniform hue with a plurality of spectral components under UV, IR excitation or UV and IR excitation.
  • the visually visible color that overlaps in the second color sub-area has a different remission for the multiple spectral components of the first color sub-area.
  • the second color sub-area contains one or more luminescence colors whose luminescence, in particular with regard to the luminescence intensities of their spectral components and/or their spectral components, are matched to the overlapping visually visible color of the normal motif area, so that together with the visually visible color in UV and / or IR excitation produce the specified uniform hue.
  • the color sub-areas can be arranged at a distance, but it is particularly advantageous for the first and second color sub-areas to be arranged adjacent to one another, so that they appear with their uniform hue as a coherent luminescent surface area.
  • the luminescence motif area contains several color areas with different but uniform color tones in the form of a motif, in particular in the form of a portrait, an architectural, technical or natural motif, or an alphanumeric character string. If several color areas are present, this is an advantage at least in part of the color areas, the associated first and second partial color areas are arranged adjacent to one another.
  • Such complex motifs represent an effective and at the same time easily verifiable authenticity assurance, since the human eye reacts very sensitively to color differences in partial areas of a motif that should actually appear with the same hue.
  • a correct reproduction of such complex motifs despite the fact that the luminescence is influenced differently in some areas by the presence of the visually visible color, represents a major technological hurdle for potential counterfeiters that is difficult to overcome.
  • the luminescence motif area advantageously contains at least one color area which produces a white or gray hue in luminescence under UV and/or IR excitation.
  • the normal motif has two or more different color tones in the overlapping area, which makes it even more difficult for a potential counterfeiter to match the luminescence intensity in the first or the second partial color areas.
  • the uniform hue of a color area does not represent the complementary color of the overlapping visually visible color of the second color sub-area.
  • the normal motif area is formed at least partially by a carrier of the luminescent element and/or at least partially by colored layers of the luminescent element.
  • the color layers of the normal motif area can be at least partially provided with a scattering additive, in particular titanium dioxide, to a to achieve higher reflectivity and brightness in the second partial color range. This is particularly advantageous when the luminescence colors are applied above the normal subject area.
  • the luminescence colors of the second partial color area can be arranged above or below the color layers of the normal motif area.
  • the luminescence in the second partial color range exhibits other luminescence intensities in the UV and/or IR excitation for the same spectral components as in the first partial color range or other spectral components than in the first partial color range.
  • At least one of the one or more luminescence colors in the first color sub-area can differ from the one or more luminescence colors in the second color sub-area.
  • the color sub-areas can therefore include different luminescence colors.
  • the several luminescence colors in the partial color areas are particularly preferably the same and only the proportion of the luminescence colors is different.
  • the luminescence in both partial color ranges can have the same spectral components with different intensities.
  • the spectral components of the uniform hue are generated by luminescent primary dyes, which preferably contain at least two, in particular three luminescent primary dyes.
  • the luminescent primary dyes can be, for example, from the group consisting of luminescent green, luminescent red and luminescent blue.
  • a luminescent color layer is provided in the second partial color area, which layer represents a mixture of at least two, in particular three, luminescent primary colorants.
  • the luminescence intensity of the second partial color area is adjusted by setting a mixing ratio of the luminescent primary dyes in the luminescent color layer.
  • a layer sequence of at least two, in particular three, luminescent color layers is provided in the second partial color area, each of which is formed by a luminescent primary dye.
  • the luminescence intensity of the second partial color area is adjusted by adjusting the relative area coverage of the luminescent color layers of the layer sequence.
  • the luminescent colors or the luminescent primary dyes are preferably visually transparent (ie transparent in the visible spectral range).
  • a layer sequence of two luminescent color layers can be provided in the second partial color area, with a first color layer being formed by a luminescent primary dye, for example luminescent red, and the second color layer being a mixture of two other primary luminescent dyes, for example luminescent green and luminescent blue.
  • a layer thickness ratio of the first to the second luminescent color layer of 1:2 white luminescence can be produced with the two color layers.
  • Many mixed colors can also be produced, but of course with the restriction that the relative ratio of the luminescent primary dyes used in the second color layer is fixed.
  • the normal motif area and the luminescence motif area are present on a translucent or transparent carrier substrate that covers the visible spectral range.
  • the carrier substrate is also particularly preferably designed to be absorbent in the UV spectral range from 200 to 400 nm, so that the luminescence motif can only be seen with UV excitation of that substrate side on which the luminescence motif area is arranged.
  • the named luminescence area is advantageously designed for excitation by UV light in all configurations.
  • the invention also includes a data carrier such as security paper, value document or identity document as a luminescent element of the type described.
  • a data carrier such as security paper, value document or identity document
  • the luminescence motif area and/or the normal motif area can be transferred from a temporary carrier to the data carrier, which optionally already includes the normal motif area or the luminescence motif area.
  • the luminescence element can also be present as a security element, such as a patch, stripe or thread.
  • the security element for a data carrier (of the types mentioned) can then be applied to or incorporated into a data carrier, or it can form an integral part of a data carrier itself.
  • the luminescent element or the security element has its own carrier, which can be designed in particular as a film layer.
  • the data carrier can be, in particular, a bank note, a paper or card-based identity or identification document, a credit card, a product or brand protection application, a tax stamp, a ticket, a TÜV label, a security label or a license plate number act.
  • the invention further includes a method for producing a luminescence element of the type described, in which the luminescence motif area is generated with at least one color area, which after excitation by UV, IR radiation or UV and IR radiation with uniform tone with luminescence.
  • the color area is generated with a first color sub-area, which lies outside the overlapping area with the normal subject area and with a second color sub-area, which lies within the overlapping area with the normal subject area.
  • the first partial color area is generated with one or more luminescent colors that generate the specified uniform hue with multiple spectral components under UV and/or IR excitation.
  • the visually visible color that overlaps in the second color sub-area has a different remission for the multiple spectral components of the first color sub-area.
  • the second partial color area is generated with one or more luminescence colors whose luminescence, in particular in terms of the luminescence intensity(s) and/or spectral component(s), has been matched to the overlapping, visually visible color of the normal subject area, so that it is visible in the UV and / or IR excitation with their spectral components - together with the visually visible color - produce the uniform hue mentioned.
  • the hues of the first and second partial color ranges are preferably matched to one another by a colorimetric method in order to produce the uniform hue mentioned.
  • Different reflectance can arise in particular due to wavelength-dependent different transmission and/or absorption.
  • the normal motif area and the luminescent motif area can be formed in particular by imprints, with classic printing methods such as offset printing, letterpress, indirect letterpress, flexographic printing, gravure printing or screen printing being able to be used to form the imprints.
  • Digital printing processes such as ink-jet printing, laser printing, thermal sublimation printing, Thermal transfer printing, indirect ink jet printing such as nanoprinting and/or film transfer processes can be used.
  • Metals, plastics, plastic-foil composites, paper-based substrates and/or hybrid substrates consisting of a combination of the substrates mentioned come into consideration as the substrate of the luminescent element.
  • the luminescent element according to the invention also provides increased protection against counterfeiting, because many re-enactments are created using conventional offset printing machines and/or inkjet office printers, and the registration of print areas is carried out both in offset printing machines and in inkjet printers different printing colors is a problem if the printing takes place in two or more process steps or if the substrate is transported from one printing unit to the next printing unit. In an offset printing press, this is the case when printing is not carried out using a common impression cylinder.
  • simulations are usually generated with a first printer that is only filled with fluorescent inks that are not visible to the eye in the cartridges, and with a second printer that is only filled with inks that are visible to the eye.
  • the substrate is printed in two process steps, so that the registration inaccuracies mentioned above occur.
  • register fluctuations may not necessarily be noticed by the viewer, with the significantly more complex design of the luminescence elements according to the invention, these are easily noticeable as color tone deviations in actually uniform color areas and therefore present potential counterfeiters with considerable problems in achieving the required or necessary register.
  • the luminescent element according to the invention therefore has a very high level of protection against counterfeiting, combined with the possibility of attractive designs and simple verification even by laypersons.
  • FIG. 1 schematically shows a bank note 10 with a feature area 12.
  • the bank note 10 is the luminescence element.
  • the luminescence element it is also possible for the luminescence element to be formed by a separate element which includes the feature region 12 and which is applied to or incorporated into the bank note 10 or another data carrier.
  • the feature area 12 has luminescent properties and, when viewed under a UV lamp, exhibits a true color appearance that differs significantly from its daylight appearance.
  • the changed visual impression allows a simple authenticity check of the banknote 10, but the authenticity feature is difficult to reproduce due to the special combination of a normal motif with a luminescent motif described below and therefore offers high security against forgery.
  • FIG.2(a) showing the appearance presented to a viewer 20 in ordinary artificial or natural light 22
  • Fig.2(b) 12 shows the appearance presented to the viewer 20 upon excitation of the feature region 12 with UV radiation 26.
  • the appearance of the feature area 12 changes significantly: As in Fig.2(b) shown, the viewer 20 then sees instead of the two red triangles 14 at the same location on the one hand a uniformly white luminescent rhombus 16 and on the other hand a uniformly orange-green (or red) luminescent rhombus 18 in front of the non-luminescent background of banknote paper.
  • the luminescent color tone of the diamonds 16, 18 extends uniformly both over the area 14 that appears red in daylight and over an area 14i that does not differ from the background in daylight.
  • the luminescent color tones are not simple spectral colors, but rather represent complex color tones formed from a number of spectral components, in the example shown white and orange-green (or red). of orange and green is misunderstood.
  • white and orange-green (or red) of orange and green is misunderstood.
  • the generation of uniform, complex color tones in areas with and without a visible color background poses considerable technological problems for potential counterfeiters.
  • the human eye is very sensitive to color differences, so that even small deviations in the luminescent color tones in the areas 14 or 14i can easily be perceived and recognized as an indication of a counterfeit product.
  • the feature area 12 contains, on the one hand, a normal motif area 30, which is formed by two red imprints 32, 34 in the form of triangles pointing to the right.
  • This normal motif area 30 can be seen in daylight 22 without any aids and generates the in Fig.2(a) shown appearance of the feature area 12.
  • the feature area 12 also contains a luminescent motif area 40 that overlaps the normal motif area 30 and, in the exemplary embodiment, consists of a left and a right diamond-shaped color area 42 and 46, respectively.
  • the colored areas 42, 46 are applied to the banknote paper or to the imprints 32, 34 with luminescent colors, which are transparent in the visible spectral range and not visible to the naked eye and therefore do not appear without UV excitation.
  • the left diamond-shaped color area 42 contains a first color sub-area 44-1, which adjoins the imprint 32 of the normal motif area 30 but does not overlap with it, and a second color sub-area 44-2, which lies over the red imprint 32 of the normal motif area 30.
  • the luminescence primary colors luminescence red, luminescence green and luminescence blue are printed in the first partial color area 44-1 in a mixing ratio that produces white luminescence upon UV excitation.
  • the luminescence intensity of the mixed white luminescence color can be lowered or adapted to the luminescence intensity in the area 44-2 by adding a transparent white (non-fluorescent).
  • the three luminescence primary colors mentioned are also used in the second color sub-area 44-2, but the proportion of luminescence red is reduced compared to the first color sub-area 44-1 (and the proportions of luminescence green and luminescence blue may be increased), in order to avoid influencing the luminescence emission by to take into account the red background imprint 32 and to achieve the same white luminescence overall as in the first partial color area 44-1.
  • white fluorescence based on a fluorescent substance, e.g. Honeywell CD350
  • a uniform white luminescence hue for the diamond-shaped color area 42 can be obtained due to the different mixing ratio of the luminescence primary colors, each of which produces a spectral component of the desired luminescence.
  • the right diamond-shaped color area 46 contains a first color area 48-1, which adjoins the imprint 34 of the normal motif area 30 but does not overlap with it, and a second color area 48-2, which lies over the red imprint 34 of the normal motif area 30.
  • the luminescence primary colors luminescence red, luminescence green and luminescence blue are printed in the first partial color area 48-1 in a mixing ratio that produces an orange-green (or red) luminescence upon UV excitation.
  • the three primary luminescence colors mentioned are also used in the second color sub-area 48-2, but in a different mixing ratio than in the color sub-area 48-1, in order to take into account the influence of the luminescence emission by the red imprint 34 and overall to the same orange-green ( or red) luminescence as in the first partial color region 48-1.
  • a uniform orange-green (or red) luminescence hue for the diamond-shaped color area 46 can be obtained due to the different mixing ratio of the luminescence primary colors, each of which produces a spectral component of the desired luminescence.
  • test prints are produced, on the one hand with the specified red color of the imprints 32, 34 with a luminescence imprint for white luminescence arranged above it, consisting for example of one green and one blue and a red luminescent, visually non-visible luminescent base color.
  • a background color e.g. red
  • a desired luminescence color e.g. white
  • test prints are created with the luminescence print for white luminescence without the red background print.
  • the appearance of the test prints under UV exposure is recorded, the color values of the various sub-areas are determined and the color deviation from the desired target state, namely a white luminescence of the same color with and without a red background print, is determined.
  • the composition of the luminescent base colors used is modified in the desired direction and test prints are produced with the modified composition.
  • the test prints are again checked with the help of the image acquisition system and, if necessary, a further modification is made. This process is repeated until the hues of the color sub-areas involved have a sufficiently uniform hue.
  • the color distance can also be calculated in another color system, whereby the CIE Lab color system is used with particular advantage, as it takes human perception of colors and color differences particularly well into account.
  • ⁇ E falls below a predetermined threshold value, for example 2, 3, 5 or 10.
  • the required modification of the composition can be determined, for example, with a computer program that contains the concentration data of the luminescence base colors involved and the luminescence base colors with the admixture of the visually visible color as base data.
  • FIG 4 schematically illustrates a luminescent element 50 according to a further embodiment of the invention, wherein Fig.4(a) the luminescent element 50 in cross section, Fig.4(b) the appearance of the luminescent element 50 in top view under daylight illumination 22 and Fig.4(c) the appearance of the luminescent element 50 in a top view when exposed to UV light 26 .
  • the luminescent element 50 of 4 contains on a carrier 52 two background prints 54, 56 with a non-fluorescent, visually visible red color, a print 60 of a visually not visible fluorescent color that produces a white fluorescence together with the red color of the background print 54, a print 62 of a visually not visible , white fluorescent fluorescent ink, an imprint 64 of a visually invisible fluorescent ink which, together with the red ink of the background imprint 54, produces an orange fluorescence, and an imprint 66 of a visually invisible, orange fluorescent fluorescent ink.
  • the imprints 62 and 64 can be applied with the same fluorescent color.
  • the red background prints 54, 56 form a normal motif area 30, which can be seen when viewed in daylight 22, as in Fig.4(b) shown.
  • the imprints 62, 66 provided at the points without background imprint are not visually recognizable in daylight, their position is in Fig.4(b) only indicated by dashed lines.
  • the imprints 60-66 form a luminescent motif area 40 which overlaps the normal motif area 30 .
  • the imprints 60, 64 lie above the background imprints 54, 56 of the normal motif area, while the imprints 62, 66 lie outside the normal motif area.
  • a left color area 42 of the luminescent motif area 40 is formed by the imprints 60 and 62 .
  • the luminescence primary colors are luminescence red, luminescence green and luminescence blue printed in a mixing ratio that produces white luminescence when exposed to UV light.
  • the luminescence primary colors mentioned are also used in the area of imprint 60, however the proportion of luminescence red is reduced compared to imprint 62 in order to take into account the influence of the luminescence by the red background imprint 54 and to achieve the same white hue of the luminescence as in the area of Imprint 62 to arrive.
  • a right-hand color area 46 of the luminescent motif area 40 is formed by the imprints 64 and 66 .
  • the luminescence primary colors luminescence red, luminescence green, and luminescence blue are printed in a mixing ratio that produces an orange luminescence on UV excitation.
  • the luminescence primary colors mentioned are also used, but in a modified mixing ratio compared to imprint 66, in order to take into account the influence of the luminescence by the red background imprint 56 and to the same orange hue of the luminescence as in the area of imprint 66 to get.
  • the appearance of the luminescent element 50 changes significantly, while two spaced red rectangles 54, 56 are visible under daylight illumination, as in FIG Fig.4(b) shown, two larger luminescence regions 42, 46, each with uniform white and orange-colored luminescence, occur at the same location when exposed to UV light.
  • the relative weight of the spectral luminescence components cannot only be determined by the mixing ratio of the luminescence primary colors in a homogeneously applied color layer be set, but with particular advantage through the relative area coverage of several full-area or screened luminescence primary color layers.
  • figure 5 1 shows a schematic cross section of a luminescent element 70 according to the invention, which when viewed in daylight and with UV excitation shows the same appearance as the luminescent element 50 in FIG 4 .
  • the luminescent element 70 contains a carrier 52 on which, as in the luminescent element 50, two background prints 54, 56 made of a non-fluorescent, visually visible red color are applied, which form the normal motif area 30 of the luminescent element.
  • the luminescence motif area 40 is in the exemplary embodiment figure 5 formed by a three layer sequence 72 comprising a visually non-visible green luminescent ink layer 74-G, a visually non-visible red luminescent ink layer 74-R, and a visually non-visible blue luminescent ink layer 74-B. If all three luminescent color layers are printed over the entire surface, additive color mixing results in a white luminescent color tone after UV excitation.
  • one or more of the luminescent ink layers 74-G, 74-R, 74-B are printed in areas as a grid and the optically effective area coverage is thereby different ranges as desired between 0% and 100%.
  • the green luminescent color layer 74-G and the blue luminescent color layer 74-B are applied with high area coverage and the red luminescent color layer 74-R with low area coverage, so that in area 80 with UV excitation together with the absorption by the background print 54 results overall in a white luminescent hue.
  • the green luminescent color layer 74-G, the blue luminescent color layer 74-B and the red luminescent color layer 74-R are applied with the same average area coverage, so that a white luminescence color tone results in area 82 upon UV excitation.
  • the area coverage of all luminescent color layers is reduced in area 82 in order to adapt not only the hue but also the luminescence brightness of area 82 to the luminescence brightness of area 80, which cannot assume the maximum possible value due to the absorbent background 54.
  • the green luminescent color layer 74-G, the blue luminescent color layer 74-B and the red luminescent color layer 74-R are applied with the same high area coverage, so that there with UV excitation due to the absorption by the background print 56 overall an orange luminescent hue results.
  • the red luminescent color layer 74-R with high area coverage and the green luminescent color layer 74-G and the blue luminescent color layer 74-B with medium area coverage are applied in area 86, so that there is a luminescence with a to area under UV excitation 84 uniform orange hue results There is also area coverage of the luminescent color layers is reduced to match not only the hue but also the luminescence brightness of region 86 to the luminescence brightness of region 84.
  • the exact area coverages of the luminescent color layers are advantageously determined analogously to the procedure described above by a series of test prints, the detection of the luminescent color shades achieved and a modification of the area coverages.
  • the sequence of the luminescent primary color layers can of course also be selected differently than in the exemplary embodiment.
  • a change in the order of the layers due to different color acceptance of the colors, absorption effects and scattering usually requires a change in the surface coverage in order to obtain the same visual appearance.
  • figure 6 shows a modification of the design of the figure 5 , in which only two primary color layers are used in the luminescence element 90 for the layer sequence 92 of the luminescence motif area 40, namely on the one hand a red luminescent color layer 94-R with the luminescence primary dye luminescence red, and on the other hand a cyan luminescent color layer 94-C, which is a mixture of the Luminescent primary dyes containing luminescent green and luminescent blue. Because of the additive color mixture, white luminescence can also be achieved by matching the area coverages of the red luminescent color layer 94-R and the cyan luminescent color layer 94-C.
  • Fig.7(a) a simple dot screen 100 for one of the luminescent color layers, in which the screen elements of the screen are uniformly formed by small screen dots.
  • Figure 7(b) shows a complex motif grid 102 of a luminescent color layer, in which the grid elements 104 are formed by small faces that form a superstructure in the form of the letter "E".
  • the grid of FIG. 6(b) appears as a uniform area coverage, with a magnifying glass the letter "E” and finally with a microscope the faces of the grid elements 104 can be resolved.
  • These complex grids can serve as additional authenticity protection and hurdle for potential counterfeiters.

Claims (21)

  1. Elément de luminescence (10) ayant une zone de motif normal (30) dont le motif normal coloré (32, 34) est reconnaissable sans moyen auxiliaire dans la plage spectrale visible,
    et ayant une zone de motif luminescent qui chevauche partiellement la zone de motif normal et dont le motif luminescent coloré n'est reconnaissable qu'après excitation avec du rayonnement ultraviolet et/ou infrarouge, cependant que,
    - la zone de motif luminescent (40) comporte au moins une zone de couleur (44-1, 48-1) qui, après excitation par rayonnement ultraviolet et/ou infrarouge, engendre de la luminescence en une teinte uniforme, et qui comporte une première zone partielle de couleur située à l'extérieur de la zone de chevauchement avec la zone de motif normal et une deuxième zone partielle de couleur (44-2, 48-2) située à l'intérieur de la zone de chevauchement avec la zone de motif normal,
    caractérisé en ce que
    - la première zone partielle de couleur comporte une ou plusieurs couleurs luminescentes qui génèrent de manière luminescente lors de l'excitation ultraviolette et/ou infrarouge avec plusieurs composants spectraux la teinte uniforme précitée, et
    - la deuxième zone partielle de couleur comporte une ou plusieurs couleurs luminescentes dont la luminescence est ajustée de telle façon par rapport à la couleur chevauchante visuellement visible, de la zone de motif normal, qui présente une réflectance différente pour les plusieurs composants spectraux de la première zone partielle de couleur, que, lors de l'excitation ultraviolette et/ou infrarouge, la une ou les plusieurs couleurs luminescentes de la deuxième zone partielle de couleur génèrent conjointement avec la couleur visuellement visible la teinte uniforme précitée.
  2. Elément de luminescence selon la revendication 1, caractérisé en ce que la première et deuxième zone partielle de couleur sont agencées de manière adjacente entre elles.
  3. Elément de luminescence selon la revendication 1 ou 2, caractérisé en ce que la zone de motif luminescent comporte plusieurs zones de couleur ayant différentes teintes uniformes sous forme d'un motif, en particulier sous forme d'un portrait, d'un motif architectural, technique ou de la nature, ou d'une suite alphanumérique de caractères.
  4. Elément de luminescence selon au moins une des revendications de 1 à 3, caractérisé en ce que la zone de motif luminescent comporte au moins une zone de couleur qui, lors d'une excitation avec du rayonnement ultraviolet ou infrarouge, génère en luminescence une teinte blanche ou grise.
  5. Elément de luminescence selon au moins une des revendications de 1 à 4, caractérisé en ce que le motif normal comporte dans la zone de chevauchement deux ou davantage teintes différentes.
  6. Elément de luminescence selon au moins une des revendications de 1 à 5, caractérisé en ce que la teinte uniforme d'une zone de couleur ne représente pas la couleur complémentaire de la couleur chevauchante visuellement visible de la deuxième zone partielle de couleur.
  7. Elément de luminescence selon au moins une des revendications de 1 à 6, caractérisé en ce que la zone de motif normal est constitué au moins partiellement par un support de l'élément de luminescence et/ou au moins partiellement par des couches de couleur de l'élément de luminescence.
  8. Elément de luminescence selon au moins une des revendications de 1 à 7, caractérisé en ce que les couches de couleur de la zone de motif normal sont pourvues au moins partiellement d'un additif diffuseur, en particulier dioxyde de titane.
  9. Elément de luminescence selon au moins une des revendications de 1 à 8, caractérisé en ce que les couleurs luminescentes de la deuxième zone partielle de couleur sont agencées au-dessus ou au-dessous des couches de couleur.
  10. Elément de luminescence selon au moins une des revendications de 1 à 9, caractérisé en ce que la luminescence dans la deuxième zone partielle de couleur présente, lors de l'excitation ultraviolette et/ou infrarouge, d'autres intensités de luminescence pour les mêmes composants spectraux ou d'autres composants spectraux.
  11. Elément de luminescence selon au moins une des revendications de 1 à 10, caractérisé en ce qu'au moins une de la une ou des plusieurs couleurs luminescentes dans la première et la deuxième zone partielle de couleur se différencient entre elles.
  12. Elément de luminescence selon au moins une des revendications de 1 à 11, caractérisé en ce que les composants spectraux de la teinte uniforme sont générés par des colorants de base luminescents qui comportent de préférence au moins deux, en outre de préférence trois colorants de base luminescents, en particulier du groupe consistant en vert luminescent, rouge luminescent et bleu luminescent.
  13. Elément de luminescence selon au moins une des revendications de 1 à 12, caractérisé en ce que, dans la deuxième zone partielle de couleur, une couche de couleur luminescente est prévue, laquelle représente un mélange d'au moins deux, en particulier trois colorants de base luminescents, cependant que la luminescence de la deuxième zone partielle de couleur est ajustée par le réglage d'un rapport de mélange des colorants de base luminescents dans la couche de couleur luminescente.
  14. Elément de luminescence selon au moins une des revendications de 1 à 12, caractérisé en ce que, dans la deuxième zone partielle de couleur, une suite de couches consistant en au moins deux, en particulier trois couches de couleur luminescentes est prévue, lesquelles sont respectivement constituées par un colorant de base luminescent, cependant que la luminescence de la deuxième zone partielle de couleur est ajustée par le réglage de la couverture relative de surface des couches de couleur luminescentes.
  15. Elément de luminescence selon la revendication 14, caractérisé en ce que les couches de couleur luminescentes sont, pour le réglage d'une couverture de surface, réalisées au moins partiellement sous forme tramée, cependant que les trames représentent en particulier des trames de points, des trames de chaînes, des trames à modulation de fréquence ou des trames en lettres, en chiffres ou en figures géométriques, cependant que, en outre de préférence, les trames sont constituées par des éléments de trame dont la taille se situe en-dessous du pouvoir de résolution de l'œil humain, en particulier en-dessous de 150 µm ou même en-dessous de 100 µm.
  16. Elément de luminescence selon au moins une des revendications de 1 à 15, caractérisé en ce que la zone de motif normal et la zone de motif luminescent se trouvent sur un substrat porteur transparent, semi-transparent ou opaque dans la plage spectrale visible, cependant que le substrat porteur est de préférence absorbant dans la plage spectrale ultraviolette comprise entre 200 et 300 nm.
  17. Elément de luminescence selon au moins une des revendications de 1 à 16 sous forme d'un support de données, en particulier papier de sécurité, document de valeur ou document d'identification, ou d'un élément de sécurité pour un support de données tel que papier de sécurité, document de valeur ou document d'identification.
  18. Procédé de fabrication d'un élément de luminescence, en particulier selon une des revendications de 1 à 17, comprenant
    - génération d'une zone de motif normal dont le motif normal coloré est reconnaissable sans moyen auxiliaire dans la plage spectrale visible,
    - génération d'une zone de motif luminescent ayant au moins une zone de couleur qui engendre de la luminescence en une teinte uniforme après excitation ultraviolette et/ou infrarouge et qui est générée avec une première zone partielle de couleur située à l'extérieur de la zone de chevauchement avec une zone de motif normal, et avec une deuxième zone partielle de couleur située à l'intérieur de la zone de chevauchement avec la zone de motif normal,
    cependant que la première zone partielle de couleur est générée avec une ou plusieurs couleurs luminescentes qui, avec plusieurs composants spectraux lors de l'excitation ultraviolette et/ou infrarouge, génèrent la teinte uniforme précitée,
    cependant que la couleur visuellement visible présente dans la zone de chevauchement de la zone de motif normal une réflectance différente pour les plusieurs composants spectraux, et
    cependant que la deuxième zone partielle de couleur est générée avec une ou plusieurs couleurs luminescentes dont la luminescence, en particulier en intensité et/ou en composants spectraux, est, avant les étapes de la génération, ajustée par rapport à la couleur chevauchante visuellement visible de la zone de motif normal, de telle façon que la une ou les plusieurs couleurs luminescentes, lors de l'excitation ultraviolette et/ou infrarouge, génèrent conjointement avec la couleur visuellement visible la teinte uniforme précitée.
  19. Procédé selon la revendication 18, caractérisé en ce que les couleurs luminescentes, de la première et deuxième zone partielle de couleur, différentes quant à l'intensité de luminescence et/ou quant aux composants spectraux de la luminescence, sont ajustées entre elles par un procédé colorimétrique afin de générer une teinte uniforme.
  20. Procédé selon la revendication 18 ou 19, caractérisé en ce que, à l'étape de l'ajustage,
    - tout d'abord la couleur visuellement visible est définie,
    - des couleurs luminescentes de base sont définies,
    - des teintes après excitation sont mesurées pour chaque couleur luminescente de base conjointement avec et sans la couleur visuellement visible, cependant qu'en particulier, respectivement pour des intensités différentes, la couleur luminescente de base est mesurée, et ensuite les proportions des couleurs luminescentes de base dans la deuxième zone partielle de couleur sont définies sur la base des mesures de teintes.
  21. Procédé selon la revendication 20, caractérisé en ce que les proportions déterminées sont utilisées pour définir le recouvrement de surface d'une trame de la couleur luminescente respective de base, cependant qu'en particulier une augmentation de la valeur tonale est prise en compte pour la couleur luminescente de base.
EP20020514.4A 2019-11-21 2020-11-09 Element luminescent avec zone de motif luminescente Active EP3825141B1 (fr)

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DE102021002764A1 (de) 2021-05-27 2022-12-01 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung einer lumineszenten Druckfarbe
DE102021002759A1 (de) * 2021-05-27 2022-12-01 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Erzeugung einer lumineszenten Sicherheitsmarkierung und lumineszente Sicherheitsmarkierung
DE102022000932A1 (de) 2022-03-17 2023-09-21 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung von Wertdokumenten und Sensorsystem zur Qualitätsprüfung bei der Herstellung von Wertdokumenten

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US7422158B2 (en) * 2003-10-24 2008-09-09 Pitney Bowes Inc. Fluorescent hidden indicium
US7926730B2 (en) * 2005-11-30 2011-04-19 Pitney Bowes Inc. Combined multi-spectral document markings
JP5622087B2 (ja) * 2010-08-09 2014-11-12 大日本印刷株式会社 発光媒体
DE102017004037B4 (de) * 2017-04-26 2019-06-27 Mühlbauer Gmbh & Co. Kg Sicherheitseinlage mit einer Vertiefung für ein Ausweisdokument und Verfahren zur Herstellung einer Sicherheitseinlage mit einer Vertiefung für ein Ausweisdokument
DE102017127923A1 (de) * 2017-11-27 2019-06-13 Bundesdruckerei Gmbh Codierungssystem zum Ausbilden eines Sicherheitsmerkmals in oder an einem Sicherheits- oder Wertdokument oder einer Mehrzahl von Sicherheits- oder Wertdokumenten
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