EP3452299A1 - Élément de sécurité doté d'une impression luminescente - Google Patents

Élément de sécurité doté d'une impression luminescente

Info

Publication number
EP3452299A1
EP3452299A1 EP17720681.0A EP17720681A EP3452299A1 EP 3452299 A1 EP3452299 A1 EP 3452299A1 EP 17720681 A EP17720681 A EP 17720681A EP 3452299 A1 EP3452299 A1 EP 3452299A1
Authority
EP
European Patent Office
Prior art keywords
luminescent
white
imprint
security element
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.)
Granted
Application number
EP17720681.0A
Other languages
German (de)
English (en)
Other versions
EP3452299B1 (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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3452299A1 publication Critical patent/EP3452299A1/fr
Application granted granted Critical
Publication of EP3452299B1 publication Critical patent/EP3452299B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects

Definitions

  • the invention relates to a security element for securing security papers, documents of value and other data carriers, with a luminescent imprint which shows a multicolored motif in UV light.
  • the invention also relates to a method for producing such a security element as well as to a data carrier equipped with such a security element.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • a fluorescent color is printed in the form of a motif, which is not visible in normal daylight, but when viewed under UV illumination is visible.
  • the fluorescent color can also be admixed with a visible color in daylight, so that the printed motif is visible even in daylight, but with a different hue.
  • the printing of true-color luminescence images has also been known for several years.
  • the implementation is usually done in inkjet printing with special colors, which are not visible in visible light and after excitation by UV light a comparable color impression as a classic picture, such as a portrait of the passport owner show.
  • the present invention seeks to provide a security element of the type mentioned above with attractive visual appearance and high protection against counterfeiting. This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
  • the luminescent imprint is formed by printed luminescent white on the one hand and at least two printed luminescent basic dyes, for example from the group consisting of luminescent green, luminescent red and luminescent blue, on the other hand, and the multicolor motif also in FIG colored areas contains achromatic parts, which are formed in the imprint at least partially by luminescent white.
  • luminescent white refers to a white-luminescent luminescent substance.
  • luminescent red, luminescent green, and luminescent blue respectively red, green, and blue luminescent luminescent.
  • At least two, but usually three, basic luminescent dyes are used.
  • Luminescent red, luminescent green, and luminescent blue form the usual primary colors.
  • Other primary colors to choose for the luminescent basic dyes is possible in the present case.
  • Three luminescent Basic dyes may be chosen so that their additive color mixing results in white.
  • the luminescence is preferably a photoluminescence.
  • the luminescence includes fluorescence and phosphorescence, in particular also anti-Stokes luminescence.
  • luminescent substances for example, all fluorescent and phosphorescent substances come into question.
  • substances which emit white light after appropriate excitation are suitable as luminescent white.
  • Luminescent white can (before printing) also be provided as a mixture of luminescent pigments, in particular red, blue and green luminescent.
  • the energy transfer from excitation to luminescence can also be multistage, so that a first substance absorbs the excitation energy and transfers it directly or via further intermediate steps to the finally emitting luminescent substance.
  • the most transparent possible luminescent colors are used, which can be achieved for example by the use of small luminescent pigments, in particular of nanopigments, and / or the use of a highly transparent binder.
  • the excitation of the luminescent substance or, in the case of a transmission of the excitation energy, the excitation of the first substance preferably takes place in the ultraviolet (UV) spectral range.
  • UV ultraviolet
  • An excitation in the infrared range for the luminescence in the visible range is also conceivable.
  • the wavelength range from 315 nm to 380 nm is described as long-wave UV radiation (UV-A), the wavelength range from 280 nm to 315 nm as medium-wave UV radiation (UV-B) and the wavelength range from 100 nm to 280 nm as short-wave UV Radiation (UV-C).
  • UV-A long-wave UV radiation
  • UV-B medium-wave UV radiation
  • UV-C short-wave UV Radiation
  • the excitation can be carried out with UV-A and / or UV-B and / or UV-C radiation.
  • the multicolored motif contains not only the primary colors, such as red, green, and blue, but also mixed colors of two or all three primary colors. The motif therefore has a realistic appearance and, in the context of this description, is sometimes referred to as a true color image or true color luminescence image.
  • the multicolored motif in subregions can also contain pure grayscale without any color component.
  • the multicolor motif also contains achromatic parts in the colored areas, which result in the manner explained in greater detail below with reference to FIG. 2 by a decomposition of the color structure into an achromatic component and a chromatic component. These achromatic parts of the color structure are now formed in the print according to the invention at least partially by luminescence white.
  • the process stability when printing true color luminescence images can be significantly increased.
  • some printing processes such as offset or high pressure, may have process problems in printing three primary colors one on top of the other.
  • the number of primary colors required can generally be reduced to two, as explained in more detail below.
  • any problems with the drying of the colors on a substrate in particular the physical drying of mineral oil-based offset inks can be overcome, since the entire color coverage can be reduced by the use of luminescent white.
  • problems with the controlled regression of color in the inking of a printing plate cylinder, a transfer cylinder can also be overcome. For example, a blanket cylinder in offset printing, and overcome the substrate, since the color splitting takes place the more undefined, the greater the number of non-intermediate dried different layers of paint.
  • the inventors have also found that the use of luminescent white in addition to the luminescent basic dyes in the print and the representable color space is increased. The use of fluorescent white further allows increased flexibility in the selection of luminescent basic dyes.
  • the choice of the luminescent basic dyes must then be less compromised in terms of resistances, luminosity and / or price than when a true color luminescence images is printed exclusively with the three luminescent basic dyes.
  • color variations when using fluorescent white are less conspicuous than in the case where a white color impression must be produced by printing the three primary luminescent colors one upon the other or side by side. In the latter case, not only does the intensity of the whiteness change in general, but it can also give rise to a certain bluish, yellowish or reddish color.
  • the luminescent imprint is formed by luminescent white on the one hand and the three luminescent basic dyes luminescent green, luminescent red and luminescent blue on the other hand.
  • the achromatic parts of the multicolor motif are preferably formed completely by the luminescent white, at least in a partial region of the motif. In this case, for each color pixel or for each same color Color range to be dispensed with at least one of the luminescent basic dyes used.
  • the luminescent white may consist of a single luminescent substance, but may also be formed from a mixture of two or more luminescent substances, which in combination give a white.
  • the mixture can contain both dyes and pigments.
  • the luminescent substances which form the luminescent white advantageously have a similar surface functionalization by means of a surface coating.
  • a separation of the color can also be counteracted by the fact that the luminescent substances forming the luminescent white are present in a common capsule.
  • the fluorescence white may in particular have a high luminous intensity, which exceeds the luminosity of a combination of the three luminescent basic dyes.
  • the luminescent white of the luminescent imprint can be excited in a first UV excitation area together with the luminescent primary dyes present in the imprint.
  • the luminescent white in a second UV excitation region, can be excited individually without the luminescent basic dyes present in the imprint.
  • the first UV excitation region can be, for example, the long-wave UV, the second UV excitation region the short-wave UV.
  • the luminescent imprint shows the multi-color motif when excited in the first UV excitation region, while it excites in the second UV excitation region shows a grayscale reduction of the multicolor motif, ie a grayscale motif that has the same image content as the multicolored motif and is not just colored.
  • the luminescent white of the imprint has a double function in this development, since on the one hand it is part of a first security feature in the form of the colored luminescent motif.
  • the luminescent white is also part of a separately testable second security feature, which is given in the form of a gray-scale image by the spatial distribution of luminescent white in the imprint.
  • the grayscale image may in particular represent a gray scale reduction of the multicolor motif, but it may also contain additional, in particular hidden, information by means of a spatial variation of the luminescence white fraction, as explained in greater detail below.
  • the luminescent basic dyes may contain, for example, an absorber for the second UV excitation region, so that excitation with UV radiation from the second UV excitation region does not lead to luminescence of the luminescence.
  • Basic dyes leads.
  • the achromatic parts of the motif in a camouflage region of the motif are formed only by the luminescent basic dyes.
  • the camouflage area is not recognizable on excitation in the first UV excitation area, while it emerges visibly upon excitation in the second UV excitation area.
  • the luminescent imprint in the UV light in addition to the multicolor motif also shows a gray scale pattern with different brightness values, which is formed by the luminescent white without using the luminescent base dyes.
  • Such a gray scale pattern can not practically be produced with luminescent basic dyes without a residual color, so that an adjustment of the security element without the use of luminescent white is also easily recognizable to the layman.
  • it may contain or even consist of a gray wedge.
  • a possible residual color of an adjustment is particularly easy to notice.
  • the pure grayscale pattern can in particular also obtain stepless gray transitions, since these too are particularly difficult to recreate with the luminescent basic dyes alone.
  • a multicolored motif is divided into a multicolored subregion and a monochromatic subregion.
  • the monochromatic subregion is preferably printed only with luminescence white.
  • the subregions are arranged precisely to one another, in particular since they are produced in one printing operation.
  • the multicolor subregion is preferably arranged within the monochromatic subregion.
  • a multicolored main motif such as a building, a tree or a person, can therefore be set off particularly clearly from the monochromatic or grayscale background, such as a landscape, a building or a vehicle.
  • the entire motif can be excited with a first radiation (UV-A) and selectively only the multicolored partial region with a second radiation (UV-B).
  • the basic dyes can only be excited by radiation from one of the UV regions (UV-A, UV-B or UV-C) while the luminescent white can be excited by UV radiation from at least two (or all) of the UV regions (UV -A, UV-B and UV-C).
  • the luminescent white or at least one of the luminescent basic dyes is phosphorescent.
  • An afterglow after the end of the excitation becomes apparent. The afterglow would only be recognizable to an observer when using phosphorescent agents with a longer afterglow time (> 1-2 seconds). By machine, an afterglow, possibly also shorter, for example in the millisecond range, can be recognized or evaluated as an authenticity feature.
  • the luminescent white is printed with a different grid than the luminescent basic dyes.
  • the raster can differ in predetermined raster parameters (in particular raster angle, raster point shape or modulation) and / or in the raster type (eg frequency modulated (1st order, 2nd order), amplitude modulated or crossmodulated).
  • the different screens can be used as an authenticity feature. Detection of the difference is possible, for example, by means of a microscope, raster counter (eg GHG mini-lithometer) and / or moiree structure.
  • the luminescent imprint is imprinted onto a substrate which is substantially non-luminescent after UV excitation.
  • the luminescent imprint is imprinted onto a substrate which luminesces after UV excitation, and is provided in partial areas with a UV absorber in order to localize the substrate luminescence suppress.
  • the UV absorber may be absorptive of radiation of all UV ranges (UV-A, UV-B and UV-C) or selectively radiation of one or two of the UV ranges.
  • the invention also includes a method for producing a security element for securing security papers, documents of value and other data carriers, with a luminescent printing, which shows a multicolored motif in UV light, wherein in the process - the luminescent printing by printing luminescence white on the one hand and Printing of at least two luminescent basic dyes, in particular from the group consisting of Lumineszenzrion, Lumineszenzrot and Lumineszenzblau, on the other hand is formed, and the multicolor motif also in colored areas contains achromatic parts, which are formed in the print at least partially by luminescence white.
  • the imprint can be produced by means of different printing processes, in particular gravure printing, inkjet printing, flexographic printing, screen printing, offset printing or transfer printing (including sublimation transfer or thermal transfer).
  • the imprint is screened.
  • the imprint is rasterized. Different brightness values are achieved by area variation (in the raster) and / or layer thickness variation.
  • the imprint can be applied to a substrate, in particular in gravure or offset printing.
  • transparent luminescent colors are used. Transparent luminescent colors are particularly suitable for overprinting, in particular two, three or four colors. Thus, finer grid structures can be used, as possible deviations (register variations) are less critical.
  • the imprint may alternatively or additionally be made variable in its layer thickness to represent different brightness values, in particular by means of ink-jet printing or gravure printing.
  • ink-jet printing it is possible to print several droplets on top of each other or to print droplets of different sizes.
  • gravure printing it is possible to engrave the printing plate (produced by means of a stylus or laser) which are different deep. In both cases, different brightness values result from the transferred layer thickness.
  • FIG. 1 is a schematic representation of a banknote with a security element according to the invention
  • FIG. 2 shows schematically the color composition of a color region of the multicolor motif, in (a) without the use of luminescent white and in (b) using luminescent white,
  • Fig. 4 shows schematically the appearance of an inventive
  • FIG. 5 shows in (a) an inventive division of an imprint into a camouflage area and a normal area, in (b) schematically the appearance of the imprint when illuminated with long-wave UV radiation and in (c) schematically the appearance of the imprint when illuminated with short-wave UV Radiation, and
  • FIG. 6 schematically shows a luminescent printing of another security element according to the invention.
  • the invention will now be explained using the example of security elements for banknotes.
  • 1 shows a schematic representation of a banknote 10, which is provided with a luminescent imprint 14 in a partial area with a security element 12 according to the invention.
  • the print 14 shows when viewed in UV light in additive color mixing a multi-colored motif, here for illustration in the form of a butterfly.
  • the security element 12 is part of the banknote 10, but it can also be embodied as a separate security element in other configurations, for example as a transfer element that is applied to a banknote or another data carrier.
  • a peculiarity of the luminescent imprint 14 consists in the fact that the imprint is not only formed by the luminescent basic dyes luminescence green, luminescent red and luminescent blue, but that at least a fraction of the colored motif passes through at least partially
  • Lumineszenz ie a white luminescent luminescent substance is generated.
  • FIG. 2 (a) schematically shows the color composition of a specific color region of the multicolor motif, for example a color pixel or a monochrome surface region.
  • the color range shows a mixed color (true color), for example, by Lumineszenzrot 20R, ie a red luminescent luminescent, with a coverage of 100%, by Lumineszenzrion 20G, ie a green luminescent luminescent, with a coverage of 75%, and by Lumineszenzblau 20B , that is to say a blue-luminescent luminescent substance, with a surface coverage of 40%.
  • the color structure of FIG. 2 (a) can be decomposed into an achromatic component 22 and a chromatic component 24.
  • this colored portion 22 is now at least partially formed according to the invention not by a combination of luminescent green 20G, luminescent red 20R and luminescent blue 20B, but by the additional luminescent luminescent white 20W, as shown in FIG. 2 (b).
  • the areal coverage of the three luminescent basic dyes can be reduced (reference numerals 26R, 26G, 26B), so that the overall result is a lower areal coverage.
  • the achromatic component 22 of a color region can also be completely formed by luminescence white 20 W.
  • the areal coverage of luminescent blue 20B can be reduced to zero by a sufficiently large proportion of luminescent white 20W and the true color of the color area can only be generated with luminescent green 20G, luminescent red 20R and luminescent white 20W.
  • the different variants will be explained again with reference to FIG. 3 on the basis of color pixels of a luminescent printing.
  • the color pixels can also be representative of a larger, monochrome area of the imprint.
  • the layer sequence or the arrangement of the color pixels can be generated in any order.
  • the color pixel 30 has a structure corresponding to FIG. 2 (a) without the use of luminescent white 20W.
  • such color pixels or color areas can be used in particular for generating additional effects, such as the introduction of hidden information, described in more detail in connection with FIG. 5, into a true color luminescence image.
  • the color pixel 32 luminesces in the suitable UV light with the same true color as the color pixel 30 and has a structure according to FIG. 2 (b). In the case of the color pixel 32, part of the colored portion of the illustrated true color is replaced by luminescent white 20W, so that the area coverage of the luminescent primary colors 20R, 20G, 20B is correspondingly reduced.
  • the color pixel 34 luminesces in the suitable UV light with the same true color as the color pixels 30 and 32. In the color pixel 34, however, the colorant part of the true color is completely replaced by luminescent white 20W and the use of luminescent blue 20B can be dispensed with desired true color alone with luminescent white 20W and the two luminescent basic dyes Lumineszenzrion 20G and Lumineszenzrot 20R can be generated.
  • the color pixel 36 is a modification of the color pixel 32 with all four luminescent colors 20W, 20R, 20G, 20B, wherein the colors are not printed one above the other but side by side. Not shown separately is, for example, a possible layer sequence in which the luminescent white 20W is printed on the luminescent basic colors.
  • the absorber layer should preferably be absorbent for only a partial region, for example UV-A radiation, from the (UV) excitation radiation.
  • the absorber layer can be printed in full color on one of the luminescent layers in the color pixel 34 or only partially cover one of the luminescent layers 20R, 20G, 20B or 20W.
  • the luminescent substances 20W, 20R, 20G, 20B are selected such that the luminescent white 20W of the imprint 14 in the long-wave UV, for example at an excitation wavelength of 366 nm, together with the Lumineszenz basic dyes 20R, 20G, 20B is excitable, while excitation in the short-wave UV, for example at an excitation wavelength of 254 nm, only the luminescent white 20W, but not the luminescent basic dyes 20R, 20G, 20B are excitable.
  • the achromatic parts 22 of the butterfly motif are completely formed in all colored areas by luminescent white 20W.
  • the print 14 thus shows the multicolor motif in true color representation 50 under long-wave UV radiation 42, as illustrated schematically in FIG. 4 (a).
  • the luminescent white 20W may be arranged in the layer sequence above the basic dyes 20G, 20B, 20R, in particular if one of the or the base dyes 20G, 20B, 20R include UV absorbing moieties, eg, UVA absorbing.
  • An optional background for the true color representation 50 may be free of luminescent printing, but is preferably designed as a white (or light gray) luminescent background 51, for example printed with luminescent white 20W.
  • the short-wave UV source 44 and the long-wave UV lamp 40 can be different devices, or can also be integrated in one device and formed, for example, by a switchable lamp or a lamp with selectable (different) filters.
  • the different excitability of the luminescent substances 20W, 20R, 20G, 20B can be achieved, for example, by the fact that for the luminescence For example, for luminescent green 20G, luminescent red 20R and luminescent blue 20B, luminescent substances which are selectively excitable only in the long-wave UV are selected.
  • all the luminescent substances used can in principle be stimulated broadband, wherein the luminescent basic dyes 20R, 20G, 20B, an additional UV absorber for the short-wave UV radiation is added so that incident short-wave UV radiation is absorbed and not to a luminescence of Luminescent basic dyes 20R, 20G, 20B leads.
  • UV absorbers are Tinuvin 400 or resins or binders which absorb short-wave UV radiation.
  • a typical broad UV-excitable luminescent substance is about CD 350 from Honeywell.
  • an additional hidden information in a multi-colored motif can be coded by a skillful choice of the luminescent substance combinations. 4, so that in the long-wave UV all four luminescent colors 20W, 20R, 20G, 20B can be excited, while in the short-wave UV only the luminescent white 20W can be excited.
  • a camouflage region 62 is defined in the desired colored motif 60, which in the exemplary embodiment is embodied in the form of the inscription "original".
  • the true colors of the subject are generated without the use of luminescent white 20W only with the luminescent primary colors 20R, 20G, 20B as shown in Fig. 2 (a) and the color pixel 30 of Fig. 3.
  • the true colors of the motif are generated using luminescent white 20W, as explained with reference to Fig. 2 (b) and the color pixels 32, 34 of Fig. 3.
  • the non-colored portion 22 of the true colors in the normal region 64 is even completely formed by luminescent white 20W.
  • the subject 60 in the present case comprises a true-color luminescent representation 66 in front of an (optional) white-luminescent background 67.
  • the background 67 can, as described later with advantage on FIG. 6, be in gray scale available.
  • the camouflage region 62 should be arranged completely or, as shown, at least partially within the true color representation 66. A camouflage area 62 lying outside the true color representation 66 is conceivable, but much less secure.
  • the imprint thus obtained is exposed to long-wave UV radiation 42 of a UV lamp 40, all four luminescent colors 20W, 20R, 20G, 20B are excited and luminesce in the corresponding color white, red, green or blue.
  • the true colors are produced in the camouflage region 62 only by the luminescent primary colors 20R, 20G, 20B.
  • the true colors of the representation 66 are generated with additional use (and / or the background 67 under exclusive use) of luminescent white 20W.
  • the camouflage area 62 blends seamlessly and without any contrast or color difference into the overall motif in true color representation 66 (and in the white background) , In the long-wave UV light 42 of the camouflage region 62 is thus not visible.
  • the imprint is subjected to short-wave UV radiation 46 of a UV source 44, only the luminescent white 20W is used for luminescence. neszenz excited, while the short-wave non-excitable colored luminescent 20R, 20G, 20B does not shine.
  • the imprint thus shows an achromatic motif in the normal region 64, which represents a gray scale reduction 52 of the multicolored butterfly motif.
  • the imprint is formed entirely without the use of luminescent white 20W, so that the camouflage region 62 does not glow with short-wave UV excitation and thus does not take part in the reconstruction of the motif.
  • the camouflage region 62 appears dark before the normal area 64 luminescent in gray (and / or white).
  • the appearance 68 shows a total overlay of the gray level reduction in the normal region 64 with the non-luminescent one Tarn Siemens 62, the black lettering "Original".
  • the optional background 69 comprises analogous non-luminescent portions of the camouflage region 62, here in the form of portions of the word "original”, and the white (or for example uniformly light gray) luminescent, unchanged forming a background, portions of the normal range 64.
  • Figure 6 shows schematically a further imprinting a luminescent imprint 70.
  • the imprint 70 comprises a first partial area 72 with a multicolored motif and a partial area 74 in shades of gray where the imprint 70 shows a colored motif in a first partial area 72 in UV light, in which more detail is given in the above described type achromatic parts of colored areas at least partially formed by luminescence white and partly by the luminescent basic dyes such as luminescence green, luminescent red and luminescent blue.
  • the imprint 70 in the second portion 74 is in the same UV light a pure grayscale pattern with different brightness values.
  • the greyscale pattern is selected such that the brightness values merge into one another steplessly, cover a large range of the possible brightness values and / or have a high number (at least 5, preferably at least 10) of different brightness values.
  • Schematically represented as subregion 74 in FIG. 6 is a grayscale wedge, as an example of a continuously formed gray scale region.
  • the different brightness values can be achieved by layer thickness variation and / or area variation (as indicated in the figure) of the print.
  • the pure grayscale pattern can also be formed, for example, by a gray scale reduction of the colored motif of the first subregion 72. It is essential that the imprint 70 in the second subregion 74 without the use of the luminescent basic dyes luminescent green, luminescent red and luminescent blue is printed only by luminescent white. In the UV light, the imprint 70 simultaneously shows a colored motif in the partial region 72 and a pure gray-scale image in the partial region 74.
  • the gray levels of the partial area 74 must each be generated by a combination of the luminescent basic dyes. Due to the specific properties of the luminescent basic dyes, however, it is usually impossible to produce correct hues with several luminescent basic dyes in several brightness levels. Rather, in the sub-area 74, a residual color, which is dependent on the brightness value of the gray levels, for which the human eye is very sensitive, and which therefore also by the untrained observer without another is perceived. An adjustment of the imprint 70 is therefore easy to distinguish from a real imprint 70.
  • the multicolor subregion 72 may be arranged within the gray scale subregion 74.
  • the gray scale subregion 74 can thus form a background for the multicolor subregion 72.

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Abstract

L'invention concerne un élément de sécurité (12) permettant la protection de papiers sécurisés, de documents de valeur et autres supports de données, comprenant une impression luminescente (14) qui présente un motif multicolore en lumière ultraviolette. Selon l'invention, l'impression luminescente (14) est constituée, d'une part, d'un blanc luminescent (20W) et, d'autre part, d'au moins deux couleurs de base luminescentes sélectionnées, notamment dans le groupe suivant : vert luminescent (20G), rouge luminescent (20R) et bleu luminescent (20B) ; et le motif multicolore contenant, dans les zones colorées, également des parties (22) non multicolores qui, dans l'impression (14), sont constituées au moins en partie du blanc luminescent (20W).
EP17720681.0A 2016-05-03 2017-05-02 Élément de sécurité doté d'une impression luminescente Active EP3452299B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016005415.8A DE102016005415A1 (de) 2016-05-03 2016-05-03 Sicherheitselement mit lumineszierendem Aufdruck
PCT/EP2017/000539 WO2017190831A1 (fr) 2016-05-03 2017-05-02 Élément de sécurité doté d'une impression luminescente

Publications (2)

Publication Number Publication Date
EP3452299A1 true EP3452299A1 (fr) 2019-03-13
EP3452299B1 EP3452299B1 (fr) 2020-12-16

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EP (1) EP3452299B1 (fr)
DE (1) DE102016005415A1 (fr)
WO (1) WO2017190831A1 (fr)

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AT521847A1 (de) 2018-11-09 2020-05-15 Hueck Folien Gmbh Verfahren zur Herstellung eines Sicherheitsmerkmals
CN112406346A (zh) * 2020-10-20 2021-02-26 航天信息股份有限公司 一种基于定位的多种打印方式相结合的打印方法及系统
DE102020131420A1 (de) * 2020-11-26 2022-06-02 Bundesdruckerei Gmbh Farbseparation zur Absicherung der Dokumenten-Personalisierung
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