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EP3291999A1 - Caractéristique de sécurité et procédé de production de celle-ci - Google Patents

Caractéristique de sécurité et procédé de production de celle-ci

Info

Publication number
EP3291999A1
EP3291999A1 EP16716165.2A EP16716165A EP3291999A1 EP 3291999 A1 EP3291999 A1 EP 3291999A1 EP 16716165 A EP16716165 A EP 16716165A EP 3291999 A1 EP3291999 A1 EP 3291999A1
Authority
EP
European Patent Office
Prior art keywords
holes
carrier
security
edge
laser radiation
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
EP16716165.2A
Other languages
German (de)
English (en)
Other versions
EP3291999B1 (fr
Inventor
Veronika RACK
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
Priority to PL16716165T priority Critical patent/PL3291999T3/pl
Publication of EP3291999A1 publication Critical patent/EP3291999A1/fr
Application granted granted Critical
Publication of EP3291999B1 publication Critical patent/EP3291999B1/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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/346—Perforations
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser

Definitions

  • the invention relates to a method for producing a security feature for a security element, a security paper or a data carrier, which has a carrier, wherein the carrier is modifiable by laser radiation in terms of its color, by the action of laser beam in the beam cross-section intensity-distributed laser holes of certain hole diameter in the Carrier are introduced, which have an edge, wherein at the same time due to the intensity distribution over the beam cross section in a zone surrounding the edge of certain zone width of the carrier is modified by the laser radiation, so that the edge is colored.
  • the invention further relates to a security feature for a security element, a security paper or a data carrier, which has a carrier which is modifiable in terms of its color, in the carrier holes of certain hole diameter are introduced, which have an edge, and in one the edge surrounding zone of certain zone width of the carrier is modified so that the edge is colored, and a security element, a security paper and a value document or a data carrier with such a security feature.
  • Such radiation is referred to herein as laser radiation which is intensity-distributed across the beam cross-section, the radiation intensity decreasing towards the edge of the laser beam.
  • This drop in intensity produces an edge at which the support is no longer cut, but a modification of the marking substance takes place with regard to its color effect. In this way, the edge region of the hole produced by laser radiation appears colored.
  • a colored border of holes is also known from WO 2009/003588 AI, but here several laser beams of different intensity are needed to achieve a particularly large and therefore well-recognizable color effect.
  • Laser radiation-sensitive markers are known, for example, from the following publications: EP 1657072 Bl, EP 000002332012 Bl, US 7270919, US 7485403, US 7998900, US 8021820, US 8048608, US 8048605, US 8083973, US 8101544, US 8101545, US 8105506, US 8173253, US 8178277, US 8278243, US 8278244 and US 842028.
  • the invention is therefore based on the object, a security element, security paper and data carriers of the type mentioned above To further improve the imitation security and to simplify the manufacturability.
  • a method for producing a security feature for a security element, a security paper or a data carrier wherein a carrier is provided, which is modifiable by laser radiation in terms of its color, by the action of laser beam in the beam cross-section intensity laser holes of certain hole diameter in the carrier are introduced, which have an edge, wherein at the same time due to the intensity distribution over the beam cross section in a zone surrounding the edge certain zone width of the carrier is modified by the laser radiation, so that the edge is colored, the holes are arranged covering a surface and within the area, adjacent holes are arranged at a hole pitch centered on the hole center which is not larger than 2.5 times the sum of the maximum hole diameter and the double zone width.
  • the object is further achieved by a method for producing a security feature for a security element, a security paper or a data carrier, wherein a carrier is provided, which is modifiable by laser radiation in terms of its color, by the action of laser beam in the beam cross-section intensity laser holes of certain hole diameter in the Carrier are introduced, which have an edge, wherein at the same time due to the intensity distribution over the beam cross section in a zone surrounding the edge certain zone width of the carrier is modified by the laser radiation, so that the edge is colored, the holes are arranged covering a surface and within the area the holes make up at least 50% of the size of the area.
  • a security feature for a security element, a security paper or a data carrier which has a carrier, wherein the carrier is modifiable in terms of its color by laser radiation, in the carrier holes of a certain hole diameter are introduced, which have an edge , and in a zone of certain zone width surrounding the edge, the carrier is modified so that the edge is colored, the holes covering one surface and within the surface all adjacent holes are located in a hole center spaced hole distance from each other greater than 2.5 times the sum of maximum hole diameter and double zone width.
  • a security feature for a security element, a security paper or a data carrier having a carrier wherein the carrier is modifiable in terms of its color by laser radiation, in the carrier holes of certain hole diameter are introduced, which have an edge, and in a zone of certain zone width surrounding the edge, the carrier is modified such that the edge is colored, the holes covering one surface and within the surface the holes make up at least 50% of the size of the surface.
  • the principle of the invention thus provides to perforate the surface, wherein said geometric specifications are met.
  • the perforation makes it possible to structure the surface with regard to an outer or inner edge.
  • the outer boundary of the surface can then be a mo- code.
  • recesses can be provided within the surface, in which no perforations are provided, so that an inner boundary is given, which can contribute to the motif.
  • the perforated surface is thus at least path-coherent, without inner boundary also simply connected.
  • a plurality of surfaces can be provided which, among other things, can also be identical, for example in the form of a plurality of lines, each forming a surface, which lie next to one another.
  • adjacent holes refers to the shape of the surface, and if the surface has an inner boundary, ie, at least one recess, and an outer boundary, as indicated by the example, the holes at the boundary are those within the surface adjacent to lying holes, of course not to the area outside the boundary, where the surface ends inside or outside an area outside the boundary of the area can preferably be provided with a coloration that is similar to the hole edges. that the boundary of the surface is at least partially not visible, in view when the holes are visible, but clearly stands out.
  • the holes can be arranged in particular in a dot matrix.
  • Various raster structures are possible, such as hexagonal rasters, rectangular rasters etc.
  • These locations may be colored in a further preferred embodiment in the color of the hole edges, eg by the hole pattern correspondingly arranged points, and most preferably a motif, encode sign or symbol that is not or poor in plan view, but clearly visible in the clear.
  • the invention uses a special arrangement of the holes in the perforated surface in order to reinforce and bring to the foreground the color effect described in WO 2009/003587 A1.
  • the term "color” is not limited to a colorful impression but may also include black
  • the perforation of the surface according to the invention produces a colored impression without a viewer having to search for a colored hole edge first, which is the case with a single hole or a single hole In the transmitted light, on the other hand, a transparent impression is imparted.With the arrangement of the holes such that adjacent holes have a hole spacing that does not exceed a certain level, the colored impression is particularly noticeable in a plan view of the surface.
  • several holes interact with regard to the colored impression.
  • the color effect is achieved in some embodiments by using a support that is directly modifiable with the laser radiation.
  • the support is previously provided with a suitable marker, e.g. coated, which is modifiable.
  • the hole spacing to the hole center ie the hole spacing as distance between the hole centers of adjacent holes, achieves the feature that the hole spacing related to the hole center is not larger than 2.5 times the sum of hole diameter and double zone width, that the color-changed zones have a comparatively large proportion of the perforated area. This ensures a particularly good color impression. It increases naturally, the higher the proportion of the color-coded zones on the remaining support surface. Therefore, it is alternatively provided that this proportion is at least 50%, preferably even 75% or 90%.
  • there is a minimum gap between adjacent holes that is twice the zone width. In the area of this minimum gap, color-coded zones then encounter each other directly.
  • the minimum gap exists on the connecting line between the hole centers.
  • the perforated surface according to the invention appears colored in plan view due to the color effect, e.g. by the marker modified in the zones around the holes. At the same time, there is also a motive in transmitted light due to the perforation of the surface and the thus changed translucency.
  • These two motifs are in perfect register with each other, since they were created by one and the same process, namely the perforation of the surface.
  • the perforated surface is larger in the x and y direction than a hole. It is therefore a two-dimensional area in which holes are juxtaposed in both coordinate directions.
  • the provision of a marker is not relevant to the passport of these two motifs. In principle, it is possible to provide the marking substance over the entire area in a much larger area than the perforated area occupies.
  • the application or provision of the marking substance and the structure of the perforated surface are combined in such a way that no marking substance is present in individual parts of the surface. In these parts, the holes then have no colored border. In the remaining parts, however, the marker is present and the edges of the holes are colored. This gives another appearance of the security feature that is difficult to imitate. If the marking dye is only provided or printed in certain areas, the colored structure of the motif can only be seen in the reflected light and not in others. This encourages viewing in transmitted light.
  • the surface can convey a certain design impression. It is therefore preferred in a development that the surface has a first and at least one second pattern, which differ with respect to the grid structure in which the holes are arranged, and / or the hole diameter and / or the hole spacing.
  • the laser-radiation-modifiable carrier or its marking substance is modified by the laser beam when the holes are introduced into the carrier.
  • the laser beam energy in an outer region of the beam cross-section is sufficient to modify the marking substance in the zone around the edge of the holes. In this way, a perfect registration of openings and laser-radiation-modified zone is automatically guaranteed.
  • the carrier with the marker it is coated in an advantageous variant of the invention on its surface with the marker, for example by a printing process.
  • the marking substance is introduced into the volume of the carrier. Depending on the carrier material, different methods are available.
  • the carrier is formed from paper
  • the marker can advantageously be mixed with the sheet formation of the paper pulp.
  • a further advantageous possibility is to introduce the marker into the volume of the paper substrate in a dipping bath, or to coat the paper substrate, e.g. in a size press, to impregnate with the marker.
  • a carrier can also be laser radiation-marked without additional marking substance. A blackening by a thermal effect is just one example of this.
  • the carrier is formed from a plastic film, e.g. the film can be formed thermoreactive or the marking substance can already be introduced into the volume of the film during the production of the film or subsequently by an impregnation step.
  • thermoreactive color pigments such as ultramarine blue
  • marking substances whose infrared-absorbing properties or their magnetic, electrical or luminescent properties are changed by the action of the laser radiation.
  • Security features with such laser-radiation-modified hole edges can be used in particular for the Schinelle authenticity test be used.
  • a combination of different marking substances for example in order to enable both a visual and a machine authenticity check of the security feature. If several markers are used, they can be placed next to each other or in different layers one above the other. Alternatively, in one embodiment of the invention, the modification of the carrier / marker may be erosion or destruction.
  • the marker is preferably a metallic coating in this case.
  • holes are produced with an oblique cutting edge by the laser cut in the carrier.
  • An oblique cutting edge can be ensured, for example, by guiding the laser beam at a predetermined angle to the surface normal of the carrier when producing the openings.
  • the size of the edge zone can be set, as will be explained in more detail below.
  • laser-radiation-modifiable effect pigments are used as the laser-radiation-modifiable marker. Such effect pigments are available to the person skilled in the art with different properties, in particular with respect to their body color, the color change under laser radiation, the threshold energy and the required laser radiation wavelength.
  • effect pigments which change not only their visible color under laser radiation but their infrared-absorbing, magnetic, electrical or luminescent properties are known to the person skilled in the art.
  • the modification of the effect pigments can be performed with laser radiation in the ultraviolet, visible baren or infrared spectral range, for example, with a C0 2 laser wavelength of 10600 nm done.
  • a pigment-free laser-radiation-modifiable marker is used.
  • Pigment-free marking substances can also be applied to the carrier or introduced into the carrier volume, for example as intaglio or printing ink. With pigment-free marking materials, a coating of high transparency can be produced, into which a permanent and high-contrast marking can be introduced by laser action at high speed.
  • Pigment-free marking substances can be modified by laser radiation in the ultraviolet, visible or infrared spectral range, for example with the 10600 nm radiation of a C0 2 laser. Concrete, non-limiting examples of pigment-free, laser-modifiable marking substances are given in the publications WO 02/101462 A1, US Pat. No. 4,344,885 and EP 0290750 B1, the disclosure of which is incorporated in the present specification to this extent.
  • the invention also encompasses a security element for security papers, documents of value and the like with a security feature produced according to the method described, wherein the security element has a carrier into which a surface is perforated by the action of laser radiation and which is laser-radiation-modifiable.
  • a security element can be designed, for example, in the form of a security thread, a label, a transfer element or a covering film for a window area or a hole in a value document, such as a banknote.
  • the invention also includes a security paper for the production of documents of value or the like with a security feature produced by the described method, wherein the security paper has a carrier which has a surface which is perforated by the action of laser radiation and which is laser radiation modifiable.
  • the invention further includes a data carrier with a security feature produced according to the described method, in particular a value document such as a banknote, identity card or the like, the data carrier having a carrier.
  • FIG. 1 shows a schematic representation of a banknote with a security feature
  • FIG. 2 is a detail view of the security feature of FIG. 1, FIG. 3 (a) - (c) the explanation of the production of the security feature, wherein
  • Fig. 3 (a) shows a schematic diagram of a spatial energy distribution of a laser beam
  • Fig. 3 (b) shows a spatial distribution of the heat energy generated during cutting
  • Fig. 3 (c) details the Dimensions of holes created by the laser beam
  • FIGS. 5 (b) and (c) are cross-sectional views of a hole of the security feature, FIG. 5 (a) showing the situation before irradiation of the laser radiation, and FIGS. 5 (b) and (c) showing two holes having different wide marginal effects.
  • FIGS. 6-9 are plan views of a security feature according to further embodiments.
  • Fig. 1 shows a schematic table representation of a banknote 10 with a security feature 12.
  • Fig. 2 in detail the security feature 12 of Fig. 1, which is provided with a plurality of laser holes with a border effect.
  • FIG. 2 shows in greater detail the security feature 12, which is shown only schematically in FIG. 1. It comprises a surface 14 which is perforated by the introduction of a plurality of holes 16 in accordance with a dot matrix R.
  • the surface 14 is in the embodiment of Fig. 2 in several parts, so that the outline of an elephant and an elephant baby in front of a semi-circular background area results.
  • the arrangement of the holes 16 in the paper 18 covers the surface 14.
  • Each hole 16 is generated by a laser beam.
  • the laser radiation can be pulsed or continuously irradiated.
  • the paper 18 was provided at least in the region of the surface 14 with a marking substance which is modifiable by the action of laser radiation with respect to a color effect.
  • the marker substance has effect pigments which, when suitably irradiated, change from a transparent, non-colored state to a red state.
  • Each hole 16 has an edge on which lies a zone in which the marker has been modified. This was done by the action of the laser radiation, ie the introduction of a hole and the modification of the marker at the edge happens for each hole 16 simultaneously.
  • FIG. 3 (a) shows by way of example a substantially Gaussian spatial intensity distribution 30 of a laser beam. The fluence therefore decreases from the center to the edge.
  • a cutting region 32 the laser beam intensity exceeds the minimum energy El required to cut the paper 18.
  • E2 designates in FIG. 3 (a) a reaction energy of the effect pigments of the marker substance, above which the said color change takes place.
  • a marking region 34 the fluence between the reaction energy E2 required for the color change and the minimum energy E1 required for cutting is present, so that in this region 34 a color change of the effect pigments is induced, but the paper 18 is not cut.
  • the paper 18 is therefore laser-cut by the laser beam in a zone at the edge of each hole 16 in perfect registration with the hole 16. colored.
  • the width of the colored zone at the edge corresponds to the width of the marking region 34 and depends on the intensity distribution 30 over the beam cross section, in this case the reaction energy of the effect pigments used and the material properties of the paper 18.
  • the laser beam intensity is below the reaction energy of the effect pigments, so that the paper 18 is not changed in color there.
  • the laser-radiation-modifiable marker 19 may be applied to the paper 18, for example printed (see Fig. 3 (c)), or may be incorporated into the volume. This can already be done in papermaking by admixing the effect pigments to the paper pulp during sheet formation or else subsequently in a dip bath or by impregnation, e.g. in a size press.
  • thermoreactive color pigments which change their visible color by the action of the laser radiation
  • thermoreactive color pigments such as ultramarine blue
  • Non-pigmented, laser-radiation-modifiable coatings can have a very high transparency in the unlabeled state.
  • laser radiation for example a C0 2 laser at 10600 nm, can be produced at high speed permanent and high-contrast markers, such as a black lettering in the coating.
  • the heat generated during laser cutting causes the modification.
  • the modified edge region of the opening can optionally even be greater than the beam extent, as illustrated in FIG. 3 (b).
  • Fig. 3 (b) schematically shows the spatial distribution 30 'of heat energy generated when cutting an aperture with the laser beam of Fig. 3 (a).
  • the heated area optionally extends beyond the beam diameter due to the heat conduction.
  • the paper 18 is cut in the cutting region 32, since there the laser energy E required for cutting
  • Threshold energy exceeds El. If the paper 18 or the marking substance 19 now reacts at least also to the thermal energy generated during cutting, then, given the ratios assumed for FIG. 3 (b), a marking region 34 'whose extension is readily greater than the cross section of the laser beam results can. With E2 'is the necessary here Called reaction energy, beyond which the desired color change occurs,
  • the marker 19 is removed or destroyed immediately adjacent to the cutting edge, and is modified only from a certain small distance from the cutting edge.
  • Fig. 3 (c) shows the effect of the laser beam having the intensity distribution 30 on the paper 18.
  • the paper 18 is coated with the marker 19.
  • a laser beam 44 intersects a hole 16 having a hole diameter C, wherein the hole in cross-section, as shown in Fig. 3 (d), for example, is tapered.
  • a hole diameter in Fig. 3 (d) of the minimum hole diameter C is entered, which results at the exit side of the laser beam 44 from the paper 18.
  • a maximum hole diameter which is greater by a two-fold removal width B than the minimum hole diameter C.
  • the sum of C and 2B results in the maximum hole diameter, which should also be denoted below by (C + 2B).
  • the marker 19 is modified to provide an annular zone 20 which surrounds the hole 16 at the entrance side of the laser beam 44 and which is color coded.
  • the hole 16 thus shows a colored border in plan view.
  • the holes 16 in the perforated surface 14 are relatively narrow staggered according to the dot matrix R, as shown in FIG. 4. In FIG.
  • the holes 16 are exemplified in the dot matrix R in a hexagonal arrangement, in which the hole spacing D, which denotes the distance between the centers of individual holes 16, has been selected such that the areas of the edge effect are just touching.
  • the hole spacing D thus corresponds to the dimension (C + 2B) + 2A of FIG. 3 (c). This is a marginal effect diameter E of FIG. 4.
  • the holes 16 are arranged in FIG. 4 exactly at this distance E.
  • the arrangement of the holes in a dot matrix is optional. It is also a quasi-statistical arrangement of the holes possible, which complies with the stated area proportions of hole and surface.
  • the colored impression in the incident light which arises when viewing the surface 16 by the juxtaposition of zones 20, of course, is also retained in other hole arrangements and hole spacings. From a hole spacing of the order of 2.5 times the rim diameter E, ie 2.5 times the sum of the maximum hole diameter (C + 2B) plus 2 times the zone width A, the colored impression becomes insufficient.
  • a green edge effect can be generated, for example, with the aid of the marking substance Manganese Ferrite F9900 M. Its color change goes from gray to green. Of course, other color changes are conceivable, for example, from red to gray with the dye Oxide Red PR222. Both dyes are from Cathay Industries. A color change from yellow to red is with the dye iron oxide yellow FeO (OH), available for example from Lanxess, possible. A color change from turquoise to black is with the dye copper (II) oxalate, available for example from Dr. med. Paul Lohmann GmbH, possible.
  • the laser beam 44 has an intensity distribution which is not constant, ie has no top hat profile. Any intensity profile in which the intensity of the laser beam 44 decreases towards the edge of the beam cross-section with respect to the maximum value can be used for generating a zone 20, the type of intensity profile naturally being based on the width of the zone 20 relative to the maximum hole diameter (FIG. C + 2B) of each hole 16.
  • the edge effect can also be formed along the entire hole edge, as can be seen in FIG. 5, if the marking substance 19 is not only at the
  • an oblique hole edge 46 is produced, as shown in FIGS. 5 (b) and (c).
  • the energy threshold value required for the reaction of the paper 18 / marking substance 19 is thereby exceeded in an edge region 48 along the oblique hole edge 46 and the paper / marking substance is modified.
  • a narrower or wider modified edge region 48 is thus produced, as illustrated in FIGS. 5 (b) and (c).
  • FIGS. 5 (a) to (c) show only the creation of a hole 16, and also the volume provided with the marking substance 19 is only for a hole drawn. This was done for the sake of simplicity of illustration only.
  • the holes are provided closely spaced in the surface 19.
  • a specific design impression can be obtained by varying the hole spacing of the perforation, for example by lateral variation of the dot matrix R or by gridless arrangement of the holes.
  • a red coloration can be achieved by laser irradiation of a coating, for example containing Polyplast PY-383 or the already mentioned iron oxide yellow.
  • FIG. 6 shows exemplary strip-shaped regions 22 in which the marking substance 19 is missing.
  • FIG. 7 shows a development in which different motives are represented in the surface 14 by different patterns 24, 26 and 28, which differ in their geometry of the dot matrix.
  • a pentagonal grid Rl is used for the background, a square grid R2 for the elephant and a hexagonal grid R3 for the baby elephant.
  • a good recognition of the three patterns 24, 26 and 28 can also be achieved, in particular in the case of comparatively large holes which are to be resolved by eye, whereas no subdivision appears in supervision.
  • the geometry differences may also affect other parameters, as explained in the general part of the description.
  • FIG. 8 shows a plan view of a further embodiment of the security feature 12. Elements which correspond to those of the previous embodiments are provided with the same reference symbols, so that their description need not be repeated.
  • the security feature 12 includes edge-colored holes 16, which are arranged in a grid R. At individual positions in the grid R no hole 16, but only a colored dot 49 is formed. Thus, the area of holes 16 thus formed not only has an outer boundary, which has the shape of an "L" in Fig. 8, but also an inner boundary which effects codings 50.
  • the dots 49 are kept in the same color as in Figs As a result, the colored dots 49 are not recognizable in plan view of the security feature 12. They appear in the same color as the rest of the area, which is colored by the colored edges of the holes 16 When viewed in transmitted light, the missing holes 16 are of course immediately noticeable, so that the codes 50 are clearly recognizable.
  • FIG. 9 shows a modification of the embodiment of FIG. 8 in that a multiplicity of inner boundaries are present in that the security feature 12 is made up of linearly aligned holes 16. alternates with linearly lined-up colored dots 49 is formed.
  • a motif is recognizable in plan view, for example in the form of a "P", which contains a line structure when viewed through the holes 16.
  • the colored dots 49 are again colored in the color which the marking substance 19 has at the edges of the holes 16
  • the security element of Fig. 9 is thus made up of a plurality of surfaces, each of which is formed from linearly aligned holes 16.
  • the adjacent holes which are directly adjacent to one another, can also be arranged in the form of a line which, for example, represents a colored border of a motif, this border then clearly emerging when viewed through the holes 16.
  • a paper 18 has been mentioned by way of example as substrate of the banknote.
  • a film or the like may be used as the substrate be used, for example, in a window area of a banknote.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Laser Beam Processing (AREA)
  • Credit Cards Or The Like (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

L'invention concerne un procédé de production d'une caractéristique de sécurité, destinée à un élément de sécurité, un papier de sécurité ou un support de données, qui présente un support (18). Le support (18) est pourvu d'une substance de marquage (19) qui est modifiable quant à sa couleur au moyen d'un rayonnement laser (44). Des trous (16), qui ont un diamètre (C) déterminé et qui possèdent un bord, sont ménagés dans le support (18) par action d'un rayonnement laser (44) dont l'intensité est distribuée sur la section transversale du faisceau. En même temps, en raison du fait que l'intensité (30) est distribuée sur la section transversale du faisceau dans une zone (20) qui entoure le bord et qui a une largeur (A) déterminée, la substance de marquage (19) peut être modifiée par le rayonnement laser (44) de sorte que le bord est coloré. Les trous (16) perforent une surface (14) et tous les trous voisins sont disposés, dans la surface (14), avec un espacement (D) entre les trous de centre à centre qui n'est pas supérieur à 2,5 fois la somme du diamètre maximum des trous et du double de largeur (A) de la zone.
EP16716165.2A 2015-05-04 2016-04-11 Caractéristique de sécurité et procédé de production de celle-ci Active EP3291999B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16716165T PL3291999T3 (pl) 2015-05-04 2016-04-11 Cecha bezpieczeństwa i sposób jej wytwarzania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015005672.7A DE102015005672A1 (de) 2015-05-04 2015-05-04 Sicherheitsmerkmal und Verfahren zu dessen Herstellung
PCT/EP2016/000595 WO2016177447A1 (fr) 2015-05-04 2016-04-11 Caractéristique de sécurité et procédé de production de celle-ci

Publications (2)

Publication Number Publication Date
EP3291999A1 true EP3291999A1 (fr) 2018-03-14
EP3291999B1 EP3291999B1 (fr) 2019-04-03

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EP (1) EP3291999B1 (fr)
DE (1) DE102015005672A1 (fr)
ES (1) ES2730450T3 (fr)
PL (1) PL3291999T3 (fr)
WO (1) WO2016177447A1 (fr)

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GB2576573C (en) 2018-08-24 2024-02-21 Hid Cid Ltd A security sheet and a security booklet
DE102024112441A1 (de) * 2024-05-03 2025-11-06 Bundesdruckerei Gmbh Dokument mit einem Sicherheitsmerkmal

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WO1988007222A1 (fr) 1987-03-19 1988-09-22 Xytronyx, Inc. Systemes de visualisation d'exposition aux rayonnements ultra-violets et d'utilisation de rayonnements ultra-violets pour effectuer des changements de couleurs
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US8048605B2 (en) 2001-03-16 2011-11-01 Datalase Ltd Laser-markable compositions
DE60232829D1 (de) 2001-03-16 2009-08-13 Datalase Ltd Verfahren zur Erzeugung eines Bildes durch Laser
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PL3291999T3 (pl) 2019-10-31
ES2730450T3 (es) 2019-11-11
WO2016177447A1 (fr) 2016-11-10
DE102015005672A1 (de) 2016-11-10
EP3291999B1 (fr) 2019-04-03

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