EP4156133A1 - Procédé de fabrication d'un substrat doté d'un élément luminescent - Google Patents

Procédé de fabrication d'un substrat doté d'un élément luminescent Download PDF

Info

Publication number
EP4156133A1
EP4156133A1 EP22020454.9A EP22020454A EP4156133A1 EP 4156133 A1 EP4156133 A1 EP 4156133A1 EP 22020454 A EP22020454 A EP 22020454A EP 4156133 A1 EP4156133 A1 EP 4156133A1
Authority
EP
European Patent Office
Prior art keywords
luminescence
substrate
area
luminescent
map
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.)
Pending
Application number
EP22020454.9A
Other languages
German (de)
English (en)
Inventor
Martin Imhof
Kai Uwe Stock
Gerhard HAMPP
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 EP4156133A1 publication Critical patent/EP4156133A1/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • 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
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties

Definitions

  • the invention relates to a method for producing a substrate, in particular a banknote or the like, with a luminescent element.
  • luminescence elements are known as a supplement to printed motifs, which can be detected with a luminescence sensor of a banknote processing device under certain lighting conditions.
  • luminescence is used in the form of phosphorescence, but luminescence in the form of fluorescence is also possible.
  • An example of such a luminescent element as a security feature can be found in WO 2014/184738 A1 .
  • a method for producing a substrate in particular a bank note or the like, is used, the substrate having a substrate surface.
  • a print motif For banknotes, this is the face of the banknote.
  • data for a print motif are generated, ie provided, which is to be reproduced by an imprint (eg by offset printing) on the substrate.
  • the print motif usually has several distributed, individual motif components. It extends over the substrate surface, since the print motif covers the substrate surface, eg the top surface of a bank note.
  • Data is also provided for a luminescence element to be arranged on the substrate surface. It has an element area smaller than the substrate area. It is also designed to be read out with a luminescence sensor of a predetermined type.
  • the luminescence sensor has a predetermined subdivision into a number of pixels, in particular a spatial resolution, with a pixel size.
  • a pixel can also be divided into sub-pixels, with the pixel size then referring to the respective sub-pixel.
  • the invention is therefore based on the object of specifying a method for producing a substrate with a luminescence element, so that the reliability of reading the luminescence element is improved independently of the specific design of the substrate, e.g. the denomination of a bank note.
  • a map of the substrate area is generated, which shows a local absorption of the luminescence radiation by the print motif.
  • the degree of absorption can preferably be used and/or the intensity and/or color of the print motif and/or reflectance can be used.
  • At least one position for the luminescence element within the substrate area is now determined on the basis of this map, with an expected intensity of the luminescence intensity of the luminescence element being optimized at this position. This intensity represents a contrast.
  • this position determination also allows the amount of luminescence dye required to generate the luminescence properties of the luminescence element to be minimized without impairing the detectability of the luminescence element by the luminescence sensor of a predetermined type.
  • the printed or applied luminescence motif remains recognizable or legible even with a visual check, for example with a UV hand lamp. If the motif consists, for example, of negative numbers, letters or a coat of arms, the motif can be severely impaired in its perceptibility by partial brightness differences due to partial absorption of the emission radiation by a background print.
  • the substrate surface is first broken down into surface elements with the pixel size in order to generate the map.
  • the absorption is then averaged for each surface element.
  • a map is obtained which is made up of surface elements with the pixel size, each surface element having an indication of the absorption of the luminescence radiation.
  • each surface element indicates a degree of absorption for the luminescence radiation.
  • x preferably being an integer.
  • a pixel resolution of the card that is at least 3 times higher than the pixel resolution of the sensor is particularly advantageous in order to also take into account possible process tolerances and deviations, such as manufacturing tolerances, such as deviations of the printed phosphor block or luminescent element by e.g. 0.5 mm from the expected position of the non luminescent motif print, or the web transport of the bank note along a sensor, e.g. a tolerance of 0.5 mm.
  • manufacturing tolerances such as deviations of the printed phosphor block or luminescent element by e.g. 0.5 mm from the expected position of the non luminescent motif print, or the web transport of the bank note along a sensor, e.g. a tolerance of 0.5 mm.
  • the optimization can preferably be carried out by evaluating as a criterion whether the intensity or the contrast exceeds a predetermined threshold value.
  • a loss of luminescence intensity can be calculated in particular, which (e.g. in each surface element) due to absorption, in particular luminescence, due to print motifs, in particular visually visible print motifs, UV radiation-absorbing or scattering or covering motifs.
  • the degree of absorption of the individual components of the print motif is considered and used as a measure of the luminescence intensity loss.
  • a particularly simple optimization is obtained from a computational point of view if areas are first defined in the map by means of a threshold value analysis, in which a luminescence intensity loss, e.g. specified as an absorptivity, exceeds a threshold value.
  • a luminescence intensity loss e.g. specified as an absorptivity
  • the luminescent elements are rectangular in order to provide a luminescent surface, for example in the form of a 1D or 2D barcode.
  • a single possible position is determined on the basis of the map, but several possible positions for the luminescence element are specified at which it can be read with a minimum contrast, i.e. a minimum intensity of the luminescence radiation can be expected.
  • a mapping is generated which can be superimposed on the print motif and which indicates possible locations and/or extents for the arrangement of the luminescent element.
  • the optimized position of the luminescent element makes it possible to apply luminescent dye relatively sparingly, in particular in a thin layer, since the impairment caused by the print motif is reduced or completely avoided due to the position optimization.
  • An equally possible possibility for optimization results from the fact that parts of the element area are identified in which the expected intensity drops below a predetermined minimum value due to absorption by the print motif. Recesses are provided in these parts, in which no luminescent dye will be applied. In this way, the need for luminescent dye is further reduced.
  • the luminescent element can be in the form of a multicolor fluorescent color image or a combination of fluorescent image and phosphorescent image.
  • the luminescence element can also consist of a substance mixture of individual substances that can be excited differently, so that different emission colors or decay times result depending on the excitation wavelength UVA-UVC and/or NIR.
  • the luminescence element itself can also consist of at least partially overlapping individual color layers and/or application layers with the same or different physical properties such as emission color and/or decay times.
  • the luminescence feature can also have a body color that is visually recognizable without excitation with UV or NIR radiation.
  • the position of the luminescence element is determined as a function of an opacity value of the luminescence color, in particular the phosphorescence color.
  • the opacity value is preferably known and can be provided by a database, for example.
  • the opacity value is preferably determined or specified under normal light, ie without UV excitation.
  • the method according to the invention can be carried out particularly preferably with a software program which contains program code or instructions for execution on a computer, the program code being designed to carry out a method of the type explained when it is executed. Providing the data for the print motif then corresponds to entering a corresponding design for the print motif into the program.
  • the invention creates an automated decision for the optimal position of the luminescence element for the production. Too low a signal intensity of the printed luminescence element on the predefined print motif, which acts as a background for the luminescence, is avoided.
  • An automated evaluation of the optimal position of the luminescence element with the aim of the strongest luminescence signal is achieved on the basis of the map, which in this sense represents a simulation. It can be generated, for example, using the digital data from the prepress stage and allows the area in which the luminescence element may/should be positioned to be delimited.
  • the optimized position is found, for example, by processing the process steps, e.g. using an automated software package for simulating an overprint with luminescent dyes, preferably as a plug-in in existing preliminary software.
  • minimal ink consumption can also be achieved.
  • the luminescent feature is not applied in the same process step as the visually visible underprint or overprint motif, experience has shown that there will be register deviations of the individual motifs, for example due to contact and print register tolerances and/or changes in substrate dimensions due to application processes such as intaglio printing or moisture differences with fiber-based substrates. These can be a few mm. Therefore, this is optionally taken into account when finding the optimal position of the luminescence motif.
  • the method it is also possible to evaluate the luminescence image impression as a screen proof, taking into account the influence of underprinted or overprinted colors, for example to recognize whether the image motif of the luminescence image is too severely restricted in terms of its recognizability by the underprinted or overprinted colors.
  • the signal intensity related to the image motif can also be displayed on the screen in false colors, e.g. red for high intensity, blue for low intensity.
  • a minimum signal for a predetermined test device e.g. a hand-held luminescence test device, is calculated for a full tone test field, e.g. outside the print motif, e.g. in the area of the sheet edge of the substrate, which is used by the printer to specify the color control.
  • a phosphorescence block 6 is also arranged on the front surface 5, which serves as an example for a luminescence element in this description. It covers a block area 7 and cannot be seen with the naked eye. Rather, it is read out with a luminescence sensor and, if necessary, suitably illuminated for this purpose with excitation radiation.
  • phosphorescence blocks are known to those skilled in the art. They represent a so-called machine-readable security feature.
  • banknote paper is suitably printed on the front side 5.
  • the print motif 4 is applied, for example, using intaglio printing, and the phosphorescence block 6 is produced by applying suitable phosphorescence inks.
  • step S1 data for the print motif 4 are first provided in a step S1.
  • step S2 the data for the phosphorescence block 6 is provided, for example the size and possibly also specific dimensions of the area that is to be printed with the phosphor dye or the phosphorescence ink.
  • a map of the front face 5 is created in a step S3. This map indicates the local absorption for the phosphorescence radiation due to the print motif 4 .
  • the print motif 4 absorbs the phosphorescence radiation locally differently because of its individual motif components.
  • the UV radiation is partially absorbed and/or partially reflected differently on the individual layers, including the deeper layers.
  • the emission of the phosphorescent color is also partially reflected or absorbed by underlying layers.
  • the phosphorescence color is emitted in all spatial directions, in particular perpendicular to the main surface of the banknote, the proportion of phosphorescence color whose emission light radiates in the direction of the interior of the banknote has a significant signal loss for the observer of the banknote.
  • the absorption intensity and/or reflection intensity depends in particular on the color of the underlying background layer and on its absorption spectrum in the range of the emission wavelength of the phosphorescence color.
  • a sensor with a strong UV light source can also be used for detection, which can also completely radiate through or penetrate the substrate.
  • the absorption map thus makes it possible to find possible positions and/or sizes for the phosphorescence block 6 at which impairment by the print motif 4 is not disruptive, for example because absorption of phosphorescence radiation by the print motif 4 remains below a specific threshold value.
  • this is given by the outline of the block surface 7 shown in dashed lines.
  • the phosphorescence block 6 is determined for checking the authenticity of the banknote 2 with a phosphorescence detector or phosphorescence sensor, which is pixellated. It is therefore preferred, in step S3, to generate the map with a resolution which Corresponds to pixel size of the phosphorescence sensor for which the phosphorescence block 6 is designed.
  • This design is in 3 shown. It shows banknote 2 in the top left. In the middle of the left 3 an intermediate method step is shown, in which the front surface 5 of the banknote 2 is divided into surface elements 8, which are ultimately the images of the pixels of a phosphorescence sensor that is used to check the authenticity of the banknote 2.
  • the front face 5 of the banknote 2 is thus subdivided into surface elements 8 which indicate, for example, the gray value or the color value which is averaged over the respective surface element 8 at the corresponding point on the front surface 5 .
  • the parameters mentioned are examples of specifying the local variation in absorption for the phosphorescence radiation.
  • the lower representation of the left column of the 3 shows the result of a next intermediate step, which subjects the front side of the map 9, which is divided into surface elements 8, to a threshold value analysis. It is checked for each surface element 8 whether the absorption (or the parameter indicating the absorption, which is shown as a function of location on the map 9) is above or below a threshold value. This results in low-absorbing planar elements 10 and high-absorbing planar elements 11.
  • the low-absorbing planar elements 10 are shown in the bottom left in the diagram 3 drawn white, the highly absorbent surface elements 11 black. Based on this black-and-white map, a surface element that corresponds to the element surface 6 in size and outline is then moved over the map 9 modified in this way in a scanning step 12 . The displacement takes place in an increment which corresponds to the surface elements 8 .
  • the integrated absorption is determined using map 9 for each displacement position. In the embodiment described, it is the threshold-filtered card with exclusively high-absorption surface elements 10 and low-absorption surface elements 11. Of course, this scanning process can also be carried out before the threshold-value filtering of the card 9.
  • the illustration in the middle of the right column 3 shows the front surface 5 of the bank note 2 with a position "a" of the element surface 7 selected within the permissible range 15.
  • the illustration at the bottom right in 3 shows that the area 15 can also be used in that several, for example different, phosphorescence blocks 6 can be used in positions "a", “b” and "c", i.e. different block areas 7a, 7b and 7c in the permissible area 15 can be arranged.
  • the subdivision of the map 9 into surface elements 8, corresponding to the pixels of the phosphorescence sensor to be used, is optional. It is equally possible to adapt the pixelation to the specific design of the phosphorescence sensor, i.e. whether it is a single-pixel sensor, in relation to which the banknote 2 is moved during the verification process, a matrix sensor, a line sensor, etc.
  • FIG. 4 shows a modified embodiment in the illustrations Figures 4A, 4B and 4C the left column of 3 is equivalent to.
  • the difference from the embodiment of 3 lies in the evaluation of the threshold-filtered map 9 according to Figure 4C , which is now not used by a scanning step 12, in which the block area 7 is shifted over the thresholded map, but directly by thresholding in the pixelated map according to FIG Figure 4C (or alternatively also in the map according to Figure 4B ) is applied.
  • a mapping 16 with permissible areas 15 and impermissible areas 14 is also obtained.
  • these areas do not necessarily have the same outline shape as the block area 7. This was the result of the scanning step 12 in the illustration at the top right 3 . Rather, the permissible ranges 15 are now determined solely by the degree of absorption of the print motif 4 on the front surface 5 .
  • the evaluation of the absorption without a scanning step 12 also has the advantage that the outline and orientation of the phosphorescence block 6 can now be adapted to the available areas of the permissible area 15 .
  • This is advantageous because often only a specific area is required for a phosphorescence block 6, but not a specific outline, for example a specific aspect ratio for a rectangle.
  • Figure 4E shows the result, in which the outline 7 of the phosphorescence block 6, for which only one area was specified, was adjusted in its aspect ratio in such a way that it covers a section that is available in the permissible range 15.
  • figure 5 shows an image similar to that 4 , but for the case that the bank note is to receive 2 phosphorescence blocks 6 with different colors.
  • the procedure according to 3 or 4 is thus carried out in, for example, three color channels R, G, B, which correspond, for example, to the colors red, green and blue. These color channels correspond to the color channels of the multicolor phosphorescent element. This results in three different possible areas for corresponding phosphorescence blocks 6R, 6G and 6B according to the color channels.
  • FIG. 1 shows a further development in which not only the aspect ratio of the phosphorescence block 6 is adjusted on the basis of the mapping 16, but also gaps are provided which are located in areas where insufficient phosphorescence would be perceptible due to the print motif.
  • FIG. 7 shows the corresponding procedure using the example of the phosphorescence block 6, which first contains a hole-like recess 18, which is located in an area in which the printing element has very strong absorption and also an optional further recess 19 in an area in which the print motif has a slightly weaker but possibly still disturbing absorption.
  • the area integral intensity decreases from left to right.
  • ink consumption also decreases, since areas that do not (recess 18) or contribute only slightly (recess 19) to the phosphorescence do not have to be printed.
  • the phosphorescence block 6 can also be structured in itself, for example in the form of a QR code 20 or another 1D or 2D barcode.
  • the luminescent color includes color components that exhibit phosphorescence and/or fluorescence properties; these can be organic as well as inorganic coloring substances (dyes, pigments, ).
  • the usually luminescent color under UV light (excitation eg in the range of 240-380 nm) can be removed with a any printing process, eg as a UV-curing ink layer (radical or cationic curing) or conventionally drying or oxidatively drying or physically (sticking away) etc., on the substrate or another print layer.
  • the luminescence layer can also be located on or in a film element, which is applied to the print carrier, for example a banknote, for example using a hot or cold embossing process.
  • the luminescence can be detected using a sensor with a brightness signal compared to an unprinted reference.
  • Various paint systems in different shades are available on the market from various manufacturers.
  • a database that contains the signal intensity of a defined sensor for a luminescent color used in relation to an underlying surface, e.g. a phosphorescent printing color on a printed motif of the banknote, is preferred for the method.
  • the print motif is characterized in that its coloring correlates with at least one printed body color or a mixture thereof with other body colors of a color manufacturer and their area coverage on the substrate and with a typical ink consumption of 0.1 to 5 g/m2, preferably 0.5 up to 2.0 g/m2, is printed in the full tone field.
  • a virtual "digital twin" of a real printed banknote proof print the real printed product is used to check the luminescence intensity based on at least one substrate color and a color profile specialized with available printing inks.
  • the signal intensities to be expected under UV excitation are determined by summing up different signal intensities/signal integrals of the different body colors that are printed below or above the luminescent ink or are printed in mixtures with the luminescent ink.
  • a sensor-specific look-up table is created for each body color that is used as background color and for each visually transparent and/or invisibly luminescent color, as well as for each body color with an integrated specific luminescence color.
  • This look-up table contains at least one piece of information about the hue, which describes the body color, and about a sensor signal under UV light.
  • an extension to any fluorescent color is possible in addition to phosphorescence colors.
  • the interaction with a corresponding background hue must be translated in the form of an adapted look-up table for each fluorescence hue.
  • the respective look-up table indicates the reduction in intensity of the fluorescence when combined with different background colors - i.e. a scalar numerical value for each combination. This is possible, for example, in relation to a given fluorescence sensor with a given detector characteristic.
  • Embodiments enable the achievable signal intensity to be predicted and thus a guarantee for good machine readability, high process reliability and quality control during printing and sufficient visual perceptibility.
  • the method can be used in an existing print design an optimal arrangement field for the phosphorescent element can be found, which allows a good check with a measuring device, since the design-related attenuations are minimal or at least very homogeneous in the array.
  • Prediction variant 1 The prediction relates to the luminosity of a luminescence ink applied in a separate print in the given designed print area; this can either be based on an overall brightness or, viewed separately, on individual channels of an RGB sensor or a black and white sensor with an upstream red filter/green filter and blue filter as RGB signal strength.
  • Prediction variant 2 The prediction relates to the luminosity in the given print design, with either just a pure luminescent color (based on a luminescent dye) or a mixture of at least two luminescent colors with no visible body color.
  • Prediction variant 3 The prediction relates to a print design in which the luminescent color is mixed into a visually visible body color of the print design, eg a visually green color also contains a yellowish fluorescent color under UV light. So that the software can calculate the optimal position for this luminescence color, an entry in a database is used that contains the signal strength of the selected mixture of body color and luminescence color using, for example, a 1 g/m2 print with a specified sensor and specified excitation or the the signal strength is calculated via a computational model based on, for example, the Kubelka-Munk theory with infinitesimally small layers of the selected fluorescence color and the selected body color.
  • a system of alternating five layers of a fluorescent color and five layers of a twill color can be used as a model can be considered as a good approximation for a real system.
  • the light absorption of the excited luminescence color is determined by the body color, and the UV dose of the excitation lamp, which penetrates less deeply into deeper layers, is also taken into account due to the UV absorption of the layers above.
  • Prediction variant 4 If several differently colored luminescent colors are to be integrated on a colored security design and a sufficiently good signal intensity is to be achieved for the respective luminescent dye/pigment under UV lighting, the print design must be divided into the corresponding color spaces; this is an example in figure 5 performed for three luminescent colors (red, green, blue). In principle, this is also possible for any mixed colors, but means in detail that, for example, a look-up table in the database must first be created or calculated on the basis of real measured values read in, in order to carry out the corresponding image filtering. However, this is a computationally solvable problem. Here is an example of the extraction (assuming red luminescence under UV light is less affected by red body color, etc.).
  • a color tone split for the use of three different luminescence colors looks like this, for example, as shown in the figure below.
  • the designer quickly recognizes in which areas he can use all three luminescent colors together on the given background or in which area a luminescent color should not be used.
  • a so-called look-up table can be used in particular when creating the map 9 .
  • the following is an example of a subsurface hue look-up table for the expected phosphorescence intensity that describes the signal loss per pixel.
  • a look-up table can, for example, based on CIELAB values, Pantone, RGB, XYZ, HUE color space or the color series used, result in a weighting of different color tones. Attached is an example of a phosphorescence signal strength printed on real color series for typical colors in security printing, e.g. as a solid area (100%).
  • Lookup tables can also be created for smaller area coverages or lower color tone strengths (g/m2) in order to refine the model.
  • Color series, hue, area coverage, hue strength Phosphorescence Signal Strength (au) reference white 100 yellow 100.0000% 1.0 g/m 2 71 green 100.0000% 1.0 g/m 2 66 magenta red 100.0000% 1.0 g/m 2 22 black 100.0000% 1.0 g/m 2 19 red 100.0000% 1.0 g/m 2 17 orange 100.0000% 1.0 g/ m2 16 purple 100.0000% 1.0 g/m 2 14
  • the table shows the phosphor signal strength that can be achieved on different colored backgrounds with 100% area coverage for different intensities/doses/printing quantities of the phosphorescent ink.
  • a look-up table is generated by converting the digital colors of the digital proof (color spaces XYZ, RGB, CIELab, ... ) into analog colors (Pantone shade, color number, color recipe/proofing weight) and vice versa, or just in sub-steps among themselves.
  • the look-up tables can also contain other color and substrate properties, such as reflection properties, body color tone, roughness, gloss, smoothness of the substrate (calendered/uncalendered).
  • missing data can be obtained by interpolating existing data or weighted by correction factors.
  • a look-up table can also take into account the print resolution of different printing processes (offset, flexo, screen, inkjet printing).

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
EP22020454.9A 2021-09-24 2022-09-22 Procédé de fabrication d'un substrat doté d'un élément luminescent Pending EP4156133A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021004849.0A DE102021004849A1 (de) 2021-09-24 2021-09-24 Verfahren zum Herstellen eines Substrats mit einem Lumineszenzelement

Publications (1)

Publication Number Publication Date
EP4156133A1 true EP4156133A1 (fr) 2023-03-29

Family

ID=83457289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22020454.9A Pending EP4156133A1 (fr) 2021-09-24 2022-09-22 Procédé de fabrication d'un substrat doté d'un élément luminescent

Country Status (2)

Country Link
EP (1) EP4156133A1 (fr)
DE (1) DE102021004849A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326983A1 (de) * 2003-06-12 2004-12-30 Giesecke & Devrient Gmbh Wertdokument mit einem maschinenlesbaren Echtheitskennzeichen
US20140168426A1 (en) * 2012-12-17 2014-06-19 Ecole Polytechnique Federale De Lausanne (Epfl) Synthesis of authenticable halftone images with non-luminescent halftones illuminated by an adjustable luminescent emissive layer
WO2014184738A2 (fr) 2013-05-13 2014-11-20 Kba-Notasys Sa Élément de sécurité imprimé, objet comprenant ledit élément de sécurité imprimé, et procédé de fabrication dudit élément
DE102016201709A1 (de) * 2016-02-04 2017-08-10 Bundesdruckerei Gmbh Wert- oder Sicherheitsprodukt, Verfahren zum Herstellen eines Vorproduktes und Verifikationsverfahren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368684B1 (en) 1998-08-28 2002-04-09 Dai Nippon Printing Co., Ltd. Fluorescent latent image transfer film, fluorescent latent image transfer method using the same, and security pattern formed matter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326983A1 (de) * 2003-06-12 2004-12-30 Giesecke & Devrient Gmbh Wertdokument mit einem maschinenlesbaren Echtheitskennzeichen
US20140168426A1 (en) * 2012-12-17 2014-06-19 Ecole Polytechnique Federale De Lausanne (Epfl) Synthesis of authenticable halftone images with non-luminescent halftones illuminated by an adjustable luminescent emissive layer
WO2014184738A2 (fr) 2013-05-13 2014-11-20 Kba-Notasys Sa Élément de sécurité imprimé, objet comprenant ledit élément de sécurité imprimé, et procédé de fabrication dudit élément
DE102016201709A1 (de) * 2016-02-04 2017-08-10 Bundesdruckerei Gmbh Wert- oder Sicherheitsprodukt, Verfahren zum Herstellen eines Vorproduktes und Verifikationsverfahren

Also Published As

Publication number Publication date
DE102021004849A1 (de) 2023-03-30

Similar Documents

Publication Publication Date Title
EP2643161B1 (fr) Document de valeur et/ou de sécurité présentant une caractéristique de sécurité colorée transparente, ainsi que son procédé de fabrication
EP2119218B1 (fr) Procédé et système pour fabriquer des imprimés de sécurité et/ou de valeur
EP2643162B1 (fr) Document de valeur et/ou de sécurité, ainsi que son procédé de fabrication
EP3825141B1 (fr) Element luminescent avec zone de motif luminescente
EP3452299B1 (fr) Élément de sécurité doté d'une impression luminescente
EP0946661A1 (fr) Encre d'imprimerie pour marquage de securite sur un support de donnees
DE102019006315A1 (de) Optisch variables Sicherheitselement
EP1703885B1 (fr) Element de securite pour papiers de securite et documents de valeur
EP4156133A1 (fr) Procédé de fabrication d'un substrat doté d'un élément luminescent
WO2022248079A1 (fr) Procédé de fabrication d'une encre d'impression luminescente
EP3339049A1 (fr) Support de données avec des zones luminescentes
EP4347272A1 (fr) Procédé pour réaliser un marquage de sécurité luminescent et marquage de sécurité luminescent
DE60118472T2 (de) Vorrichtung zum Schutz von Dokumenten vor Verfälschung
EP1799781B1 (fr) Caracteristique de securite pour un document de valeur et de securite et document correspondant
DE102015014036A1 (de) Sicherheitselement
DE102022107442B4 (de) Verfahren zur Überprüfung der Echtheit eines Wertdokuments
WO2010054747A1 (fr) Élément de sécurité avec codage lisible par machine
AT413805B (de) Sicherheitsdokument
DE10335138A1 (de) Verfahren für die Spezifikation des Drucks und die Kontrolle der Druckqualität von Wertpapieren
EP4183592A1 (fr) Élément de sécurité transparent, support de données et procédé de fabrication
EP4311673A1 (fr) Procédé de vérification du comportement de tirage des couleurs des cylindres gravés
DE102008027548A1 (de) Mustersatz zur Abschätzung des UV-Anteils bei bestimmten Lichtbedingungen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230519

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230929

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR