EP3307551B1 - Security label with tilt effect - Google Patents
Security label with tilt effect Download PDFInfo
- Publication number
- EP3307551B1 EP3307551B1 EP16729563.3A EP16729563A EP3307551B1 EP 3307551 B1 EP3307551 B1 EP 3307551B1 EP 16729563 A EP16729563 A EP 16729563A EP 3307551 B1 EP3307551 B1 EP 3307551B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- individual
- motif
- individual motif
- motifs
- optical security
- 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.)
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Links
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- 230000003287 optical effect Effects 0.000 claims description 54
- 238000000034 method Methods 0.000 claims description 41
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000001459 lithography Methods 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000010076 replication Effects 0.000 claims description 2
- 238000004049 embossing Methods 0.000 description 14
- 239000000758 substrate Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 10
- 238000013461 design Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 101100390736 Danio rerio fign gene Proteins 0.000 description 4
- 101100390738 Mus musculus Fign gene Proteins 0.000 description 4
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- 238000000609 electron-beam lithography Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241000287107 Passer Species 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012775 heat-sealing material Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000011104 metalized film Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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Images
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
- B42D25/425—Marking by deformation, e.g. embossing
-
- 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 tamper-proof carrier with a series of optical security elements.
- the invention also relates to a method for producing a counterfeit-proof carrier with a series of optical security elements.
- Optical security elements contain very high-resolution structures that produce special optical effects. Such structures are difficult to copy and usually can not be displayed with normal printing technology.
- Optical security elements may include structures that are visible and verifiable to the naked eye, as well as structures that are verifiable with either simple or special readers.
- Optical security elements are widely known and used in a variety of ways.
- the optical security elements include z. Holograms, kinegrams and lithographs.
- optically variable elements may be holograms, specifically rainbow holograms, transmission holograms, reflection holograms, 2D holograms, 3D holograms, Fourier holograms, Fresnel holograms, volume holograms, and kinoforms.
- holograms can either be generated optically directly or calculated in the computer.
- diffractive structures may be included, in particular diffraction gratings.
- Refractive structures such as Fresnel lenses or blazed gratings may be included. It may contain scattering elements, such as diffusers. Numerous other structures are described in the literature which may be contained in optically variable elements.
- the various structures may be partially superimposed to accommodate two or more effects in the same region of the optically variable element.
- the various structures can be used to design graphical elements such as guilloches, logos, images, lines, surfaces, etc.
- textual elements can be designed, such as lettering, numeric or alphanumeric serial numbers, micro-typefaces.
- functional elements can be designed, such as barcodes or other machine-readable structures.
- Optical security elements can be manufactured in a replication process.
- a master stamp with a special overall design is created in a complex manner.
- Such master embossing dies can be produced in an electron beam lithography method or in a dot matrix method, wherein high resolutions can be achieved. In the case of electron beam lithography, resolutions of down to a few nanometers can be achieved. In the case of the dot matrix method or other interference methods, diffraction gratings with a lattice constant of down to a few 100 nanometers can be produced. From the master stamp can in turn daughter stamping be generated and of these more daughter stamping. The embossing dies are then used in an embossing process to emboss a larger amount of optically variable elements. In such an embossing process, the generated optically variable elements are substantially all the same.
- WO 2014/127403 A1 discloses a method in which a carrier layer is provided with a continuous grid layer.
- openings are introduced, which have a deeper and wider groove structure than the grid layer.
- the grid layer and the openings are covered with a liquid crystal.
- the molecules of the liquid crystal align themselves in the narrow grooves of the lattice layer while remaining unoriented in the openings.
- Light falling on the surface is reflected polarized in the areas where the molecules are aligned and unpolarized in the other areas.
- the different reflection behavior can be detected by means of a polarizer or polarized glasses.
- the closest prior art is the font WO 2013/127650 A1 in which an anti-counterfeiting carrier with at least one metallized layer is disclosed, in which at least one optically variable element is introduced, wherein the at least one optically variable element has a non-individual embossed structure and the at least one optically variable element has an individual laser lithographic structure with a resolution of less than 20 ⁇ m.
- the invention has for its object to make carriers with a series of optical security elements even more secure against counterfeiting and to provide a method for their preparation.
- the term carrier is to be understood very generally here. These may be deformable strips, in particular a strip-like multilayer film, an adhesive tape or even rigid strips.
- the wearers have in common that their length and width are significantly larger than their thickness.
- the tamper-resistant carrier according to the invention can take various forms, in particular be multi-part, ie comprise a plurality of individual carrier units. In particular, they can be designed as self-adhesive labels or heat-sealing material.
- the shape of the label or the form of a heat seal stamp can be arbitrary, for example circular, oval, polygonal with rounded corners, etc.
- the overall design can also be designed as a long strip which is sealed to the substrate for an overall longer period. Such strips are known from tickets, tickets or banknotes ago.
- the security against forgery of carriers of a series of optical security elements can be increased by adding an optical tilting effect to at least two, a plurality or each of the optical security elements.
- This can be done according to the invention by a combination or combination of an embossed structure with a lithographic structure.
- a series of optical security elements is arranged. Under a series at least two optical security elements are understood, it may also be three four or any higher number of security elements. These can all differ among themselves or some of them may be different.
- the carrier is separable between the optical security elements, so that each individual optical security element can be used as a stickable or heat-sealable label, Holospot®, Priospot®, VeoMark® or the like. is reusable. In the case of a heat-sealing film for further processing in a sealing process, the separability is not necessary.
- the carrier has at least one metallized layer, which may be a metallized foil or metallized lacquer. Other forms of the metallized layer are also conceivable.
- the carrier can first be embossed and then metallized or vice versa.
- the relief of the embossing is impressed into the metal layer.
- the metal layer is not destroyed by the embossing and serves as a reflection layer. That of the embossed structure diffracted light is reflected back into the room.
- the embossing of the metallized layer takes place by embossing a series of non-individual motifs, preferably of mutually identical or at least substantially identical motifs.
- Each of the non-individual motifs forms part of each of the optical security elements.
- a different component of the optical security element is the individual motif.
- the individual motif is different for each security element of the series.
- a series is understood here as an arrangement.
- the series may be an array of security elements arranged side by side along the support.
- the series has two, three or even more security elements or motifs.
- the security elements of the series need not be arranged directly next to each other, other security elements may be arranged within the series.
- the security elements may be linear or circular or otherwise juxtaposed.
- a motif is considered to be individual if it differs in the series of optical security elements according to the invention from all the motifs of the other security elements or at least differs from most.
- the individual motifs are different, preferably in pairs.
- Such an individual motif may be a serial number or a barcode containing, inter alia, a serial number.
- a non-individual motif is understood to mean the part of the optical security element which is stamped from a single master stamp in the production of a series of optical security elements of the non-individual motif. So the non-individual motif in each optical security element is the same or identical.
- the non-individual motif of the embossed structure is destroyed or rendered invisible by the individual motif of the lithographic structure, since the diffracted light is not reflected back in the parts of the material demetallized in the lithographic processes. This creates the appearance that the non-individual motive of the Embossed structure is masked or overprinted by the individual motif of the laser lithographic structure.
- the metallized layer is provided with a diffractive surface structure where the non-individual motif is embossed.
- diffractive is to be understood here that the non-individual motif is occupied along its metallized surface with one or more diffraction gratings, so that depending on the viewing angle and lighting the non-individual motif is visible through an iridescence.
- the diffraction gratings typically have lattice constants of 400 nm to several ⁇ m to efficiently diffract visible light.
- the diffractive surface structure therefore makes use of the principle of diffraction of the incident light, wherein the light has diffraction maxima of different order at different reflection angles, so that when obliquely viewing the diffractive surface structure a rainbow-like iridescent effect coincides with the diffraction angles, but not all Viewing angles occurs.
- the non-individual motif is superposed with an individual motif in the same metallized layer.
- an individual motif is laser-lithographed and the individual motif has recesses, which are preferably not processed by laser lithography.
- the recesses form at least a partial motif, but possibly also the entire non-individual motif, and the recesses are arranged in register on the individual motif.
- a structure to be exposed is transferred into a substrate by means of a laser beam.
- the structure to be exposed is specified or calculated by means of a computer and is available in the form of image or vector data.
- the image or vector data is used by the laser lithograph to control the position of the laser beam relative to the substrate and to control the intensity and duration of the laser beam impinging on the substrate.
- a writing beam can stand firmly in the room and the substrate can be moved relative to it. It can also be the substrate fixed in space and the writing beam are moved relative to this. Furthermore, both substrate and laser beam can be moved. It is also possible to modulate the writing beam by means of a surface light modulator and thus to expose a larger area of the substrate at once. Even with this principle, writing beam and substrate can be moved.
- wavelengths are in the range of 0.2 .mu.m to 10 .mu.m, preferably in the range of 0.2 .mu.m to 1 .mu.m. Smaller wavelengths are also possible. At these wavelengths structures can be generated that are effective in the range of visible light (wavelength about 0.4 microns to 0.7 microns). Thus, diffraction gratings with lattice constants on the order of the visible light can be generated, which have large diffraction angles and therefore can be perceived particularly well.
- Optical security elements produced by laser lithography can be fully customized in terms of design due to the production process. All structures can be designed individually. This can be done using numeric or alphanumeric serial numbers, or by individual graphic elements such as images or guilloches.
- the wavelength, intensity, pulse duration, shape and writing energy of the laser beam can be adjusted so that the substrate material is demetallised at certain predefined locations and thus becomes transparent or semitransparent. This is done either by ablation of the metal layer, by shifting the metal layer towards the edges of the exposed area or by converting the metal layer into a transparent or semi-transparent oxide layer. There may also be a mixture of the three mentioned effects.
- the demetallization can be aligned in register with the other structures that can be generated by laser lithography, since it can be introduced in the same exposure process.
- gray values can be generated by suitable halftoning in a halftone process, wherein only a certain portion of the surface is demetallized in an area screened. In the case of gray value wedges, the demetallised surface area gradually increases due to the adaptation of the screening in the area.
- laser lithography also makes it possible to reduce the thickness of the metal layer by precisely adjusting the introduced laser energy during the writing process. By reducing the thickness of the metal layer, the light transmission of the metal layer increases. This also allows gray values and gray wedges to be generated.
- optical security elements with high-resolution laser lithography is subject to certain limitations.
- the basic resolution is limited by the wavelength of the write laser used and by the optics used. Since high write speeds and thus high throughput are to be achieved in a mass production, it is desirable to further reduce the resolution, since then larger areas can be exposed in a shorter time.
- Typical base resolutions used here are 0.5 ⁇ m to 5 ⁇ m. So it is to be assumed in the laser lithography of a limited resolution.
- diffractive structures such. As grids or holograms, not all diffraction angles can be achieved by the limited resolution.
- the phase or amplitude modulation to be achieved with laser lithography is not ideal in the material, so that the theoretically maximum possible diffraction efficiency of the diffractive structures is not achieved.
- the individual motif is, for example, produced in such a way that the areas which make up the individual motif are processed by laser lithography so that the metallized layer is demetallised.
- the motif is transparent, and it can under the metal layer dark or otherwise colored surfaces visually stand out, so that when viewing the optical security element, the individual motif is basically recognizable.
- the individual motif has recesses. These are areas that are not treated by laser lithography, ie continue to be metallized and thus reflect the incident light. The idea is that the recesses occupy exactly the areas used by the non-individual motif of the embossed structure. This forms the at least one optical security element by superimposing the non-individual with the individual motif.
- the non-individual motif has fine lines.
- fine is meant here that the width of the line is less than 250 ⁇ m, preferably between 50 ⁇ m and 100 ⁇ m.
- the line width is chosen so that the lines are still sufficiently wide to accommodate a diffractive structure and also to produce a diffraction effect.
- the area occupation of the non-individual motif should be low, preferably below 25%.
- the diffractive surface structure of the metallized layer preferably remains completely unchanged even by the individual motif applied by laser lithography.
- the non-individual motif may be a pattern of fine lines, such as: As concentric rings or a check pattern there are.
- the non-individual motif can be a letter, a word, a logo or a symbol. If the motif contains larger areas, only the outlines of these areas should form the motif so that the motif is composed entirely of fine lines.
- the invention is based on the fact that both the non-individual and the individual motif remain recognizable in at least one optical security element.
- the arrangement described above surprisingly produces a kind of tilting effect for the viewer of the optical security element.
- the individual motif of the laser lithographic structure comes to the fore and is almost trouble-free readable for a human observer, as if the recesses were not present , This is because the recesses are virtually unnoticeable by the small line width of the non-individual motif to the viewer.
- the non-individual motif of the embossment structure comes to the fore and seems to be above the individual motif of the laser lithographic structure for the human observer .
- the two views change when the optical security element is tilted.
- a resolution of a laser-lithographic one Method necessary to apply the recesses in the order of less than 250 microns on the other hand, a very good registration between the non-individual motifs and the individual motifs is necessary.
- the position of the non-individual motif must be recorded during the manufacturing process, for. B. by means of a registration mark, and the individual motif must be introduced by means of the laser-lithographic process according to the recorded position registration into the metallized layer.
- the non-individual motif is partially destroyed or made invisible by the individual motif of the laser lithographic process, and the tilting effect is not or at least not fully effective.
- production tolerances can occur, ie slight register errors between the non-individual motif of the embossed structure and the individual motif of the laser lithographic structure destroy the tilting effect.
- Such production tolerances are preferably taken into account in the design of the security elements.
- the maximum registration error of the production process between the two motifs is known, then the maximum registration deviation of the line width of the non-individual motif of the embossed structure can be opened.
- the line width is increased by the amount of the maximum deviation.
- the recesses of the laser lithographic structure retain their original width and are thus designed as if the lines of the non-individual motif of the embossed structure had not been broadened at all.
- the recesses still have the line of the non-individual motif of the embossed structure.
- the tilt effect remains effective.
- the disadvantage of this is, of course, that the lines are widened. However, this method and the line broadening can still compensate for smaller register deviations.
- the register deviations should be in the range of +/- 100 ⁇ m, preferably +/- 50 ⁇ m.
- the register deviation is added to the width of the recesses of the laser lithographic structure.
- the larger recesses still have the non-individual line Motive of the embossed structure available. Again, the tipping effect remains effective.
- the object is achieved by a method for producing a tamper-resistant carrier with at least one optical security element in that the optical security element generates a tilting optical effect by embossing a non-individual motif into a metallized layer and thereby forming a diffractive surface structure on the non-individual motif is generated and an individual motif is laser lithographically introduced into the metallized layer and thereby recesses are generated in the individual motif, which form at least a partial motif of the non-individual motif.
- the recesses are arranged in registration on the non-individual motif.
- a non-individual motif for example in the form of concentric rings, another mathematical pattern or a logo, is first embossed in the metallized layer.
- a stamp preferably a master embossing die is used, which permanently imprints non-individual motifs in the metallized layer, for example along an elongate support at specific intervals.
- the stamp is worked so accurately that in the metallized layer, a surface structure is introduced, which generates a diffraction grating in visible light or generates a superposition of multiple diffraction gratings in the visible light.
- the diffraction grating results in a dazzling effect and the visibility of the non-individual subject at certain viewing angles corresponding to the diffraction angle of different order.
- a further, but individual motif is then laser-lithographed in the same metallized layer.
- the metallized layer is laser-lithographically treated so as to preserve the surface structure of the non-individual motif and, as it were, to laser-lithograph only the spaces between the concentric lines or other lines of the non-individual motif.
- the lines of the individual motif and the areas of the individual motif, which are laser-lithographically treated, are significantly larger in their dimensions, ie in the millimeter range and thus when viewing the optical security element outside the diffraction angle is visibly visible.
- FIGS. 1a to 1d show various successive incorporated in a metallized layer motifs 1, 2.
- the metallized layer and a support for the metallized layer are not shown in the figures.
- Fig. 1a shows an individual motif 1 in the form of the letter "A", which is to be introduced in a conventional laser lithographic process in the metallized layer.
- Fig. 1b shows a non-individual motif 2 in the form of five concentric rings, each having a line width of 220 microns, in a conventional embossing process in the same metallized layer are formed.
- a diffractive surface 3 is produced on the metallized layer, which is not shown.
- This diffractive surface 3 is characterized in that one or more diffraction gratings for visible light are formed on the surface of the metallized layer in the region of the non-individual motif 2.
- the diffraction gratings typically have lattice constants of 400 nm to several ⁇ m to efficiently diffract visible light.
- the recesses of the diffraction gratings are usually several 100 nm deep.
- Fig. 1c shows the individual motif 1 with recesses 4 introduced into the metallized layer.
- the recesses 4 are formed in the form of sections or parts of the five concentric rings, and the sub-motif of the five concentric rings corresponds exactly to a sub-motif of the five concentric rings of the non-individual motif 2, the in Fig. 1b are shown.
- Fig. 1c the dark marked areas of the letter “A” are laserlithographically treated, the recesses 4 and the area around the letter “A” and the inner triangle of the letter “A” are not laser lithographically treated, ie the untreated areas of the individual motif 1 metallized further, and the laser lithographically treated dark areas are demetallized and do not reflect the incident light. They are in Fig. 1c shown in white.
- the metallized layer is viewed by a viewer from the outside, the demetallized areas of the individual subject 1 appear in the color of the background of the layer because the metal layer becomes transparent in this area.
- a contrasting, dark background is used. Since the demetallized surfaces are significantly larger than the metallized remaining recesses 4, the letter "A" remains clearly visible.
- Fig. 1d shows the superposition of the two motifs 1, 2 in the same metallized layer.
- the non-individual motif 2 of the embossed structure with the five concentric rings and the individual motif 1 of the lithographic structure with the letter "A" and the recesses 4 are matched in registration, so that the recesses 4 exactly from the corresponding sections of the five concentric rings fill out.
- the superimposed non-individual and the individual motive 2, 1 according to Fig. 1d are incorporated together as an optical security element 6 in the carrier.
- the letter "A” can be varied as an individual motif 1 for each other optical security element 6 of a sequence, while the non-individual motifs 2, the five concentric rings, remain the same for each of the optical security elements 6 of the sequence.
- the laser-lithograph individual motif 1 appears in the foreground since it is significantly more contrastive and prominent than the non-individual motif 2 which does not dazzle outside of the diffraction angle
- the interruptions and / or recesses 4 of the laser-lithographic individual motif 1 are not noticeable, since the recesses 4 are very fine and are less than 250 ⁇ m in width, preferably each width, along their radial circumference. Since the iridescence of the non-individual motif 2 depends on the illumination and viewing angle, a tilting effect between the two motifs 1, 2 can be achieved by tilting the optical security element 6.
- FIGS. 2a to 2d show an arrangement as in the FIGS. 1a to 1d , with the difference that the individual motif 1 is designed as a data matrix code.
- the non-individual motif 2 is again an arrangement of five concentric rings.
- the tilt effect and the manufacturing process correspond to those of FIGS. 1 to 1d , Otherwise, the same reference numerals correspond to the same features.
- the Fig. 3 schematically shows the principal problem of tolerances of the embossing and lithography process.
- the embossed structure is usually firstly pressed into the metallized layer at a distance, for example, along the carrier, and thus a series of identical non-individual motifs 2 is produced. Thereafter, an individual motif 1 with the corresponding recesses 4 is laserlithographically applied to the non-individual motifs 2 in the carriers already processed.
- the laser lithographic process must be carried out with register accuracy on the non-individual motifs 2. Exact registration accuracy, however, is virtually impossible to produce, so that after the implementation of the laser lithographic process, as a rule, the optical security element 6 according to FIG Fig. 3 arises, in which an offset between the individual motif 1 and the non-individual motif 2 occurs, ie the five concentric rings are not exactly in the recesses 4 of the individual motif 1 arranged, but somewhat offset. The tilt effect does not work anymore.
- FIGS. 4a to 4d is a first way listed to compensate for the registration error by the described production tolerances.
- register marks are arranged at the edge of the carrier structure during the embossing process, and the register marks are read in during the subsequent laser lithographic process and the laser lithographic process is exactly aligned on the basis of the register marks, nevertheless production tolerances arise, as in US Pat Fig. 3 shown.
- the lines of the non-individual motif 2 are evenly widened by a register deviation along their entire circumference.
- the lines broadened by the register deviation are in Fig. 4b shown.
- the laser lithographic individual motif 1 according to Fig. 1a and Fig. 1c is in the aforementioned laser lithographic process produced with an ideal width of the recesses 4. If the two motifs 1, 2 are arranged one above the other, appear in the recesses 4 of the individual motif 1 despite the registration error still completely the diffractive surfaces 3 of non-individual motifs 2 according to Fig. 4d , The different line strengths inside and outside the laser-lithograph individual motif 1 are not noticeable to the viewer.
- FIG. 5a to 5d an alternative embodiment of the optical security element 6 according to the invention is shown, in which also the registration error of the laser lithographic process is taken into account by the embossing process.
- the registration error of the laser lithographic process is taken into account by the embossing process.
- the recesses 4 of the laser-lithographically produced individual motif 1 in Fig. 5c are widened by the registration error, so that according to Fig. 5d Even with a deviation or an offset of the motifs 1, 2, the five concentric rings and thus the diffractive surface 3 are still completely contained in the recesses 4 and remain visible and thus produce the desired tilting effect.
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- General Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
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Description
Die Erfindung betrifft einen fälschungssicheren Träger mit einer Serie optischer Sicherheitselemente. Die Erfindung betrifft auch ein Verfahren zur Herstellung eines fälschungssicheren Trägers mit einer Serie optischer Sicherheitselemente.The invention relates to a tamper-proof carrier with a series of optical security elements. The invention also relates to a method for producing a counterfeit-proof carrier with a series of optical security elements.
Als Fälschungsschutz für Produkte, Dokumente und Ausweise werden optisch variable Elemente eingesetzt. Optische Sicherheitselemente enthalten Strukturen sehr hoher Auflösung, die spezielle optische Effekte erzeugen. Solche Strukturen sind schwer zu kopieren und können meist mit normaler Drucktechnik nicht dargestellt werden. Optische Sicherheitselemente können Strukturen enthalten, die für das bloße Auge sichtbar und verifizierbar sind sowie Strukturen, die entweder mit einfachen oder mit speziellen Lesegeräten überprüfbar sind. Optische Sicherheitselemente sind weithin bekannt und werden vielfältig eingesetzt. Zu den optischen Sicherheitselementen zählen z. B. Hologramme, Kinegramme und Lithogramme. Die Strukturen, die in optisch variablen Elementen enthalten sind, können Hologramme sein, speziell Regenbogenhologramme, Transmissionshologramme, Reflexionshologramme, 2D-Hologramme, 3D-Hologramme, Fourierhologramme, Fresnelhologramme, Volumenhologramme und Kinoforms. Solche Hologramme können entweder direkt optisch erzeugt werden oder im Computer berechnet werden. Weiterhin können diffraktive Strukturen enthalten sein, insbesondere Beugungsgitter. Es können refraktive Strukturen enthalten sein, wie Fresnellinsen oder geblazte Gitter. Es können streuende Elemente enthalten sein, wie Diffusoren. In der Literatur sind noch zahlreiche weitere Strukturen beschrieben, die in optisch variablen Elementen enthalten sein können. Die verschiedenen Strukturen können teilweise überlagert werden, um in der gleichen Region des optisch variablen Elements zwei oder mehr Effekte unterbringen zu können. Die verschiedenen Strukturen können verwendet werden, um graphische Elemente zu gestalten, wie Guillochen, Logos, Bilder, Linien, Flächen usw. Weiterhin können textuelle Elemente gestaltet werden, wie Schriftzüge, numerische oder alphanumerische Seriennummern, Mikroschriften. Weiterhin können funktionale Elemente gestaltet werden, wie Barcodes oder andere maschinenlesbare Strukturen. Die verschiedenen Strukturen und Elemente werden auf geschickte Weise zu einem Gesamtdesign für das optische Sicherheitselement verbunden, welches nach Möglichkeit alle Anforderungen bezüglich Sicherheit, Funktionalität und ästhetischem Eindruck des optischen Sicherheitselements erfüllt.As counterfeit protection for products, documents and passes optically variable elements are used. Optical security elements contain very high-resolution structures that produce special optical effects. Such structures are difficult to copy and usually can not be displayed with normal printing technology. Optical security elements may include structures that are visible and verifiable to the naked eye, as well as structures that are verifiable with either simple or special readers. Optical security elements are widely known and used in a variety of ways. The optical security elements include z. Holograms, kinegrams and lithographs. The structures contained in optically variable elements may be holograms, specifically rainbow holograms, transmission holograms, reflection holograms, 2D holograms, 3D holograms, Fourier holograms, Fresnel holograms, volume holograms, and kinoforms. Such holograms can either be generated optically directly or calculated in the computer. Furthermore, diffractive structures may be included, in particular diffraction gratings. Refractive structures such as Fresnel lenses or blazed gratings may be included. It may contain scattering elements, such as diffusers. Numerous other structures are described in the literature which may be contained in optically variable elements. The various structures may be partially superimposed to accommodate two or more effects in the same region of the optically variable element. The various structures can be used to design graphical elements such as guilloches, logos, images, lines, surfaces, etc. Furthermore, textual elements can be designed, such as lettering, numeric or alphanumeric serial numbers, micro-typefaces. Furthermore, functional elements can be designed, such as barcodes or other machine-readable structures. The various structures and elements are skilfully combined to form an overall optical security element design which, if possible, meets all the safety, functionality and aesthetic appeal requirements of the optical security element.
Optische Sicherheitselemente können in einem Replikationsprozess hergestellt werden. Hierzu wird auf aufwändige Art und Weise ein Master-Prägestempel mit einem speziellen Gesamtdesign erstellt. Solche Master-Prägestempel können in einem Elektronenstrahllithographie-Verfahren oder in einem Dotmatrix-Verfahren hergestellt werden, wobei hohe Auflösungen erreicht werden können. Im Fall der Elektronenstrahllithographie können Auflösungen von bis hinunter zu wenigen Nanometern erreicht werden. Im Fall des Dotmatrix-Verfahrens oder anderer Interferenzverfahren können Beugungsgitter mit einer Gitterkonstante von bis hinunter zu wenigen 100 Nanometern erzeugt werden. Von dem Master-Prägestempel können wiederum Tochterprägestempel erzeugt werden und von diesen weitere Tochterprägestempel. Die Prägestempel dienen dann in einem Prägeprozess der Prägung einer größeren Menge von optisch variablen Elementen. Bei einem solchen Prägeprozess sind die erzeugten optisch variablen Elemente im Wesentlichen alle gleich.Optical security elements can be manufactured in a replication process. For this purpose, a master stamp with a special overall design is created in a complex manner. Such master embossing dies can be produced in an electron beam lithography method or in a dot matrix method, wherein high resolutions can be achieved. In the case of electron beam lithography, resolutions of down to a few nanometers can be achieved. In the case of the dot matrix method or other interference methods, diffraction gratings with a lattice constant of down to a few 100 nanometers can be produced. From the master stamp can in turn daughter stamping be generated and of these more daughter stamping. The embossing dies are then used in an embossing process to emboss a larger amount of optically variable elements. In such an embossing process, the generated optically variable elements are substantially all the same.
In der
Als nächstkommender Stand der Technik wird die Schrift
Der Erfindung liegt die Aufgabe zugrunde, Träger mit einer Serie optischer Sicherheitselemente noch fälschungssicherer zu machen sowie ein Verfahren zu ihrer Herstellung zur Verfügung zu stellen.The invention has for its object to make carriers with a series of optical security elements even more secure against counterfeiting and to provide a method for their preparation.
Die Aufgabe wird hinsichtlich des Trägers durch einen fälschungssicheren Träger mit den Merkmalen des Anspruchs 1 erfüllt. Bevorzugte Weiterbildungen sind Gegenstand der abhängigen Erzeugnisansprüche.The object is achieved with respect to the carrier by a tamper-proof carrier with the features of
Der Begriff des Trägers ist hier sehr allgemein zu verstehen. Es kann sich dabei um verformbare Streifen, insbesondere eine streifenartige mehrschichtige Folie, ein Klebeband oder auch um steife Streifen handeln. Den Trägern ist gemeinsam, dass ihre Länge und ihre Breite deutlich größer sind als ihre Dicke. Die erfindungsgemäßen fälschungssicheren Träger können vielfältige Gestalt annehmen, insbesondere mehrteilig sein, also mehrere einzelne Trägereinheiten umfassen. Sie können insbesondere als selbstklebende Etiketten oder Heißsiegelmaterial ausgelegt sein. Die Etikettenform bzw. die Form eines Heißsiegelstempels kann beliebig sein, beispielsweise kreisförmig, oval, polygonal mit abgerundeten Ecken usw. Im Falle des Heißsiegelmaterials kann das Gesamtdesign auch als langer Streifen ausgelegt sein, das auf das Substrat in gesamter Länger gesiegelt wird. Solche Streifen sind von Eintrittskarten, Fahrkarten oder Banknoten her bekannt.The term carrier is to be understood very generally here. These may be deformable strips, in particular a strip-like multilayer film, an adhesive tape or even rigid strips. The wearers have in common that their length and width are significantly larger than their thickness. The tamper-resistant carrier according to the invention can take various forms, in particular be multi-part, ie comprise a plurality of individual carrier units. In particular, they can be designed as self-adhesive labels or heat-sealing material. The shape of the label or the form of a heat seal stamp can be arbitrary, for example circular, oval, polygonal with rounded corners, etc. In the case of the heat seal material, the overall design can also be designed as a long strip which is sealed to the substrate for an overall longer period. Such strips are known from tickets, tickets or banknotes ago.
Überraschend hat sich gezeigt, dass die Fälschungssicherheit von Trägern einer Serie optischer Sicherheitselemente erhöht werden kann, indem mindestens zwei, einer Mehrzahl oder jedem der optischen Sicherheitselemente ein optischer Kippeffekt hinzugefügt wird. Das kann in erfindungsgemäßer Weise durch eine Kombination oder Verbindung einer Prägestruktur mit einer lithographischen Struktur geschehen. Entlang des Trägers ist eine Serie optischer Sicherheitselemente angeordnet. Unter einer Serie werden wenigstens zwei optische Sicherheitselemente verstanden, es kann sich auch um drei vier oder jede höhere Anzahl an Sicherheitselementen handeln. Diese können alle untereinander verschieden oder einige von ihnen können verscheiden sein. Vorzugsweise ist der Träger zwischen den optischen Sicherheitselementen trennbar, so dass jedes einzelne optische Sicherheitselement als klebbares oder heißsiegelbares Etikett, Holospot®, Priospot®, VeoMark® o. Ä. weiterverwendbar ist. Im Falle eine Heißsiegelfolie zu Weiterverarbeitung in einem Siegelprozess ist die Trennbarkeit nicht notwendig.Surprisingly, it has been found that the security against forgery of carriers of a series of optical security elements can be increased by adding an optical tilting effect to at least two, a plurality or each of the optical security elements. This can be done according to the invention by a combination or combination of an embossed structure with a lithographic structure. Along the carrier a series of optical security elements is arranged. Under a series at least two optical security elements are understood, it may also be three four or any higher number of security elements. These can all differ among themselves or some of them may be different. Preferably, the carrier is separable between the optical security elements, so that each individual optical security element can be used as a stickable or heat-sealable label, Holospot®, Priospot®, VeoMark® or the like. is reusable. In the case of a heat-sealing film for further processing in a sealing process, the separability is not necessary.
Der Träger weist mindestens eine metallisierte Schicht auf, dabei kann es sich um eine metallisierte Folie oder metallisierten Lack handeln. Es sind auch andere Formen der metallisierten Schicht denkbar.The carrier has at least one metallized layer, which may be a metallized foil or metallized lacquer. Other forms of the metallized layer are also conceivable.
Der Träger kann zuerst geprägt und dann metallisiert werden oder umgekehrt. Das Relief der Prägung wird dabei in die Metallschicht eingeprägt. Die Metallschicht wird durch die Prägung nicht zerstört und dient als Reflexionsschicht. Das von der geprägten Struktur gebeugte Licht wird wieder in den Raum zurückgespiegelt. Die Prägung der metallisierten Schicht erfolgt, indem eine Serie nicht-individueller Motive, vorzugsweise untereinander identischer oder zumindest weitgehend identischer Motive, geprägt wird. Jedes der nicht-individuellen Motive bildet einen Bestandteil jeweils eines der optischen Sicherheitselemente. Ein jeweils anderer Bestandteil des optischen Sicherheitselementes ist das individuelle Motiv. Das individuelle Motiv ist für jedes Sicherheitselement der Serie verschieden.The carrier can first be embossed and then metallized or vice versa. The relief of the embossing is impressed into the metal layer. The metal layer is not destroyed by the embossing and serves as a reflection layer. That of the embossed structure diffracted light is reflected back into the room. The embossing of the metallized layer takes place by embossing a series of non-individual motifs, preferably of mutually identical or at least substantially identical motifs. Each of the non-individual motifs forms part of each of the optical security elements. A different component of the optical security element is the individual motif. The individual motif is different for each security element of the series.
Eine Serie wird hier als Anordnung verstanden. Die Serie kann eine Anordnung von entlang des Trägers nebeneinander angeordneten Sicherheitselementen sein. Die Serie weist zwei, drei oder jede höhere Anzahl an Sicherheitselementen bzw. Motiven auf. Die Sicherheitselemente der Serie brauchen aber nicht unmittelbar nebeneinander angeordnet zu sein, es können auch andere Sicherheitselemente innerhalb der Serie angeordnet sein. Die Sicherheitselemente können linear oder kreisförmig oder anderweitig nebeneinander angeordnet sein.A series is understood here as an arrangement. The series may be an array of security elements arranged side by side along the support. The series has two, three or even more security elements or motifs. However, the security elements of the series need not be arranged directly next to each other, other security elements may be arranged within the series. The security elements may be linear or circular or otherwise juxtaposed.
Der Kippeffekt zwischen dem nicht-individuellen und dem individuellen Motiv jedes Sicherheitselementes zeigt sich darin, dass unter bestimmten Betrachtungswinkeln das individuelle Motiv für den Betrachter in den Vordergrund tritt und bei anderen Betrachtungswinkeln das nicht-individuelle Motiv für den Betrachter in den Vordergrund tritt und dem individuellen Motiv überlagert erscheint.The tilting effect between the non-individual and the individual motif of each security element is reflected in the fact that under certain viewing angles the individual motif comes to the fore for the viewer and at other viewing angles the non-individual motif comes to the fore and the individual Motif overlaid appears.
Ein Motiv wird hierbei als individuell betrachtet, wenn es sich in der Serie der erfindungsgemäßen optischen Sicherheitselemente von allen Motiven der anderen Sicherheitselemente unterscheidet oder zumindest von den meisten unterscheidet. Die individuellen Motive sind verschieden, vorzugsweise paarweise verschieden. Ein solches individuelles Motiv kann eine Seriennummer sein oder ein Barcode, der unter anderem eine Seriennummer enthält. Unter einem nicht-individuellen Motiv wird der Teil des optischen Sicherheitselementes verstanden, der bei der Herstellung einer Serie von optischen Sicherheitselementen des nicht-individuellen Motivs von einem einzigen Masterprägestempel abgeprägt ist. Also ist das nicht-individuelle-Motiv in jedem optischen Sicherheitselement gleich oder identisch. Gemäß Stand der Technik wird das nicht-individuelle Motiv der Prägestruktur durch das individuelle Motiv der lithographischen Struktur zerstört bzw. unsichtbar gemacht, da das gebeugte Licht in den in den lithographischen Verfahren demetallisierten Stellen des Materials nicht zurückreflektiert wird. Dadurch wird der Anschein erweckt, dass das nicht-individuelle Motiv der Prägestruktur durch das individuelle Motiv der laserlithographischen Struktur überdeckt bzw. überdruckt wird.A motif is considered to be individual if it differs in the series of optical security elements according to the invention from all the motifs of the other security elements or at least differs from most. The individual motifs are different, preferably in pairs. Such an individual motif may be a serial number or a barcode containing, inter alia, a serial number. A non-individual motif is understood to mean the part of the optical security element which is stamped from a single master stamp in the production of a series of optical security elements of the non-individual motif. So the non-individual motif in each optical security element is the same or identical. According to the prior art, the non-individual motif of the embossed structure is destroyed or rendered invisible by the individual motif of the lithographic structure, since the diffracted light is not reflected back in the parts of the material demetallized in the lithographic processes. This creates the appearance that the non-individual motive of the Embossed structure is masked or overprinted by the individual motif of the laser lithographic structure.
Erfindungsgemäß ist die metallisierte Schicht dort, wo das nicht-individuelle Motiv eingeprägt ist, mit einer diffraktiven Oberflächenstruktur versehen. Unter diffraktiv ist hier zu verstehen, dass das nicht-individuelle Motiv entlang seiner metallisierten Oberfläche mit einem oder mehreren Beugungsgittern belegt ist, so dass je nach Betrachtungswinkel und Beleuchtung das nicht-individuelle Motiv durch ein Schillern sichtbar wird. Die Beugungsgitter haben in der Regel Gitterkonstanten von 400 nm bis zu mehreren µm, um sichtbares Licht effizient zu beugen. Die diffraktive Oberflächenstruktur macht also von dem Prinzip der Beugung des einfallenden Lichtes Gebrauch, wobei das Licht je nach Wellenlänge Beugungsmaxima unterschiedlicher Ordnung in unterschiedlichen Reflexionswinkeln aufweist, so dass beim schrägen Betrachten der diffraktiven Oberflächenstruktur ein regenbogenartig schillernder Effekt bei mit den Beugungswinkeln übereinstimmenden, aber nicht allen Betrachtungswinkeln auftritt.According to the invention, the metallized layer is provided with a diffractive surface structure where the non-individual motif is embossed. By diffractive is to be understood here that the non-individual motif is occupied along its metallized surface with one or more diffraction gratings, so that depending on the viewing angle and lighting the non-individual motif is visible through an iridescence. The diffraction gratings typically have lattice constants of 400 nm to several μm to efficiently diffract visible light. The diffractive surface structure therefore makes use of the principle of diffraction of the incident light, wherein the light has diffraction maxima of different order at different reflection angles, so that when obliquely viewing the diffractive surface structure a rainbow-like iridescent effect coincides with the diffraction angles, but not all Viewing angles occurs.
Erfindungsgemäß ist das nicht-individuelle Motiv mit einem individuellen Motiv in derselben metallisierten Schicht überlagert. In die metallisierte Schicht ist ein individuelles Motiv laserlithographisch eingebracht und das individuelle Motiv weist Aussparungen auf, die vorzugsweise laserlithographisch nicht bearbeitet sind. Die Aussparungen formen zumindest ein Teilmotiv, möglicherweise aber auch das gesamte nicht-individuelle Motiv aus, und die Aussparungen sind passergenau auf dem individuellen Motiv angeordnet.According to the invention, the non-individual motif is superposed with an individual motif in the same metallized layer. In the metallized layer, an individual motif is laser-lithographed and the individual motif has recesses, which are preferably not processed by laser lithography. The recesses form at least a partial motif, but possibly also the entire non-individual motif, and the recesses are arranged in register on the individual motif.
Unter passergenau wird hier verstanden, dass die individuellen und die nicht-individuellen Motive eines Sicherheitselementes exakt oder auch bis auf Passerabweichungen exakt zueinander angeordnet werden. Die Motive können dabei von Sicherheitselement zu Sicherheitselement höchstens um die Passerabweichung relativ zueinander verschoben sein. Die Größe der Passerabweichung, die auch Passerversatz genannt wird, wird weiter unten erörtert.Under precise register is understood here that the individual and the non-individual motives of a security element are arranged exactly or even to passer deviations exactly to each other. The motifs can be shifted from security element to security element at most by the registration error relative to each other. The size of the registration error, which is also called register offset, will be discussed below.
Bei der Laserlithographie wird eine zu belichtende Struktur mittels eines Laserstrahls in ein Substrat übertragen. Die zu belichtende Struktur wird vorgegeben oder mittels eines Computers berechnet und liegt in Form von Bild- oder Vektordaten vor. Die Bild- oder Vektordaten werden von dem Laserlithographen zur Steuerung von Position des Laserstrahls relativ zum Substrat verwendet sowie zur Steuerung der Intensität und der Einwirkdauer des auf das Substrat auftreffenden Laserstrahls. In der Laserlithographie haben sich mehrere Verfahren etabliert. So kann ein Schreibstrahl fest im Raum stehen und das Substrat relativ zu diesem bewegt werden. Es kann auch das Substrat fest im Raum stehen und der Schreibstrahl relativ zu diesem bewegt werden. Weiterhin können sowohl Substrat als auch Laserstrahl bewegt werden. Es ist auch möglich, den Schreibstrahl mittels eines Flächenlichtmodulators zu modulieren und so eine größere Fläche des Substrats auf einmal zu belichten. Auch bei diesem Prinzip können Schreibstrahl und Substrat bewegt werden.In laser lithography, a structure to be exposed is transferred into a substrate by means of a laser beam. The structure to be exposed is specified or calculated by means of a computer and is available in the form of image or vector data. The image or vector data is used by the laser lithograph to control the position of the laser beam relative to the substrate and to control the intensity and duration of the laser beam impinging on the substrate. In laser lithography Several methods have been established. Thus, a writing beam can stand firmly in the room and the substrate can be moved relative to it. It can also be the substrate fixed in space and the writing beam are moved relative to this. Furthermore, both substrate and laser beam can be moved. It is also possible to modulate the writing beam by means of a surface light modulator and thus to expose a larger area of the substrate at once. Even with this principle, writing beam and substrate can be moved.
Bei der Laserlithographie ist die Auflösung durch die verwendete Wellenlänge und durch die verwendete Optik begrenzt. Um möglichst hochauflösende Strukturen erzeugen zu können, werden daher bevorzugt kleine Wellenlängen verwendet. Geeignete Wellenlängen sind im Bereich von 0.2 µm bis 10 µm, bevorzugt im Bereich von 0.2 µm bis 1 µm. Kleinere Wellenlängen sind ebenfalls möglich. Bei diesen Wellenlängen können Strukturen erzeugt werden, die im Bereich des sichtbaren Lichts (Wellenlänge ca. 0.4 µm bis 0.7 µm) wirksam sind. So können Beugungsgitter mit Gitterkonstanten in der Größenordnung des sichtbaren Lichts erzeugt werden, die große Beugungswinkel besitzen und deswegen besonders gut wahrgenommen werden können.In laser lithography, the resolution is limited by the wavelength used and the optics used. In order to be able to generate as high-resolution structures as possible, therefore, preferably small wavelengths are used. Suitable wavelengths are in the range of 0.2 .mu.m to 10 .mu.m, preferably in the range of 0.2 .mu.m to 1 .mu.m. Smaller wavelengths are also possible. At these wavelengths structures can be generated that are effective in the range of visible light (wavelength about 0.4 microns to 0.7 microns). Thus, diffraction gratings with lattice constants on the order of the visible light can be generated, which have large diffraction angles and therefore can be perceived particularly well.
Mit Laserlithographie hergestellte optische Sicherheitselemente können herstellungsbedingt im Design voll individualisiert sein. Sämtliche Strukturen können individuell ausgeführt sein. Dies kann mithilfe von numerischen oder alphanumerischen Seriennummern geschehen oder durch individuelle graphische Elemente wie Bilder oder Guillochen.Optical security elements produced by laser lithography can be fully customized in terms of design due to the production process. All structures can be designed individually. This can be done using numeric or alphanumeric serial numbers, or by individual graphic elements such as images or guilloches.
Als Substratmaterial für die Laserlithographie werden wie bei den geprägten optischen Sicherheitselementen unter anderem metallisierte Folien oder metallisierte Lacke verwendet. In diesem Fall lässt sich der Laserstrahl in Wellenlänge, Intensität, Pulsdauer, Form und Schreibenergie so einstellen, dass das Substratmaterial an bestimmten vordefinierten Stellen demetallisiert und dadurch transparent oder semitransparent wird. Dies geschieht entweder durch Ablation der Metallschicht, durch Verschiebung der Metallschicht zu den Rändern der belichteten Stelle hin oder durch Umwandlung der Metallschicht in eine transparente oder semitransparente Oxidschicht. Es kann auch eine Mischung der drei genannten Effekte stattfinden. Die Demetallisierung kann passergenau zu den anderen durch Laserlithographie erzeugbaren Strukturen ausgerichtet werden, da sie im selben Belichtungsvorgang eingebracht werden kann. Da die Demetallisierung bei der Laserlithographie prinzipiell mit der hohen Auflösung des laserlithographischen Prozesses erfolgt, können damit hochaufgelöste demetallisierte Strukturen erzeugt werden. Dazu zählen Mikroschriften, streuende Strukturen, Grauwerte oder Grauwertkeile. Solche Grauwerte können durch geeignete Rasterung in einem Halbtonverfahren erzeugt werden, wobei in einer Fläche nur ein gewisser Anteil der Fläche gerastert demetallisiert wird. Bei Grauwertkeilen nimmt der demetallisierte Flächenanteil durch Anpassung der Rasterung in der Fläche graduell zu.As the substrate material for the laser lithography, as with the embossed optical security elements, metallized films or metallized paints are used inter alia. In this case, the wavelength, intensity, pulse duration, shape and writing energy of the laser beam can be adjusted so that the substrate material is demetallised at certain predefined locations and thus becomes transparent or semitransparent. This is done either by ablation of the metal layer, by shifting the metal layer towards the edges of the exposed area or by converting the metal layer into a transparent or semi-transparent oxide layer. There may also be a mixture of the three mentioned effects. The demetallization can be aligned in register with the other structures that can be generated by laser lithography, since it can be introduced in the same exposure process. Since the demetallization in laser lithography in principle with the high resolution of the laser lithographic Process takes place, so that high-resolution demetallized structures can be generated. These include micro-typefaces, scattering structures, gray values or gray value wedges. Such gray values can be generated by suitable halftoning in a halftone process, wherein only a certain portion of the surface is demetallized in an area screened. In the case of gray value wedges, the demetallised surface area gradually increases due to the adaptation of the screening in the area.
Neben einer vollständigen Demetallisierung ist bei der Laserlithographie auch eine Reduzierung der Dicke der Metallschicht möglich durch exaktes Einstellen der eingebrachten Laserenergie während des Schreibprozesses. Durch die Reduzierung der Dicke der Metallschicht steigt die Lichtdurchlässigkeit der Metallschicht. Auch dadurch lassen sich Grauwerte und Graukeile erzeugen.In addition to complete demetallization, laser lithography also makes it possible to reduce the thickness of the metal layer by precisely adjusting the introduced laser energy during the writing process. By reducing the thickness of the metal layer, the light transmission of the metal layer increases. This also allows gray values and gray wedges to be generated.
Die Herstellung optischer Sicherheitselemente mit hochauflösender Laserlithographie ist gewissen Limitierungen unterworfen. So ist die Basisauflösung durch die verwendete Wellenlänge des Schreiblasers und durch die verwendete Optik begrenzt. Da bei einer Massenproduktion hohe Schreibgeschwindigkeiten und somit ein hoher Durchsatz erzielt werden sollen, ist es erstrebenswert, die Auflösung weiter zu reduzieren, da dann größere Flächen in kürzerer Zeit belichtet werden können. Typische verwendete Basisauflösungen sind hier 0.5 µm bis 5 µm. Es ist also bei der Laserlithographie von einer begrenzten Auflösung auszugehen. Bei der Herstellung von beugenden Strukturen, wie z. B. Gittern oder Hologrammen, können durch die begrenzte Auflösung nicht alle Beugungswinkel erreicht werden. Weiterhin ist die mit Laserlithographie zu erreichende Phasen- oder Amplitudenmodulation im Material nicht ideal, so dass nicht die theoretisch maximal mögliche Beugungseffizienz der beugenden Strukturen erzielt wird.The production of optical security elements with high-resolution laser lithography is subject to certain limitations. Thus, the basic resolution is limited by the wavelength of the write laser used and by the optics used. Since high write speeds and thus high throughput are to be achieved in a mass production, it is desirable to further reduce the resolution, since then larger areas can be exposed in a shorter time. Typical base resolutions used here are 0.5 μm to 5 μm. So it is to be assumed in the laser lithography of a limited resolution. In the production of diffractive structures, such. As grids or holograms, not all diffraction angles can be achieved by the limited resolution. Furthermore, the phase or amplitude modulation to be achieved with laser lithography is not ideal in the material, so that the theoretically maximum possible diffraction efficiency of the diffractive structures is not achieved.
Das individuelle Motiv ist dabei beispielsweise so hergestellt, dass die Bereiche, die das individuelle Motiv ausmachen, laserlithographisch bearbeitet werden, so dass die metallisierte Schicht demetallisiert wird. Dadurch wird das Motiv transparent, und es können unter der Metallschicht liegende dunkle oder andersfarbige Flächen optisch hervortreten, so dass beim Betrachten des optischen Sicherheitselementes das individuelle Motiv grundsätzlich erkennbar ist. Erfindungsgemäß weist das individuelle Motiv jedoch Aussparungen auf. Das sind Bereiche, die laserlithographisch nicht behandelt werden, also weiterhin metallisiert sind und damit das einfallende Licht reflektieren. Die Idee liegt nun darin, dass die Aussparungen genau die Bereiche einnehmen, die von dem nicht-individuellen Motiv der Prägestruktur benutzt sind. Dadurch bildet sich das wenigstens eine optische Sicherheitselement durch Übereinander-Anordnung des nicht-individuellen mit dem individuellen Motiv aus.The individual motif is, for example, produced in such a way that the areas which make up the individual motif are processed by laser lithography so that the metallized layer is demetallised. As a result, the motif is transparent, and it can under the metal layer dark or otherwise colored surfaces visually stand out, so that when viewing the optical security element, the individual motif is basically recognizable. According to the invention, however, the individual motif has recesses. These are areas that are not treated by laser lithography, ie continue to be metallized and thus reflect the incident light. The idea is that the recesses occupy exactly the areas used by the non-individual motif of the embossed structure. This forms the at least one optical security element by superimposing the non-individual with the individual motif.
Vorzugsweise weist das nicht-individuelle Motiv feine Linien auf. Unter fein ist hier zu verstehen, dass die Breite der Linie weniger als 250 µm beträgt, vorzugsweise zwischen 50 µm und 100 µm. Die Linienbreite ist so gewählt, dass die Linien noch hinreichend breit sind, um eine diffraktive Struktur aufzunehmen und auch einen Beugungseffekt zu erzeugen. Die Flächenbelegung des nicht-individuellen Motivs sollte gering sein, vorzugsweise unterhalb von 25%. Die diffraktive Oberflächenstruktur der metallisierten Schicht bleibt auch durch das laserlithographisch aufgetragene individuelle Motiv vorzugsweise vollständig unverändert.Preferably, the non-individual motif has fine lines. By fine is meant here that the width of the line is less than 250 μm, preferably between 50 μm and 100 μm. The line width is chosen so that the lines are still sufficiently wide to accommodate a diffractive structure and also to produce a diffraction effect. The area occupation of the non-individual motif should be low, preferably below 25%. The diffractive surface structure of the metallized layer preferably remains completely unchanged even by the individual motif applied by laser lithography.
Das nicht-individuelle Motiv kann ein Muster aus feinen Linien sein, wie z. B. konzentrische Ringe oder ein Karomuster es sind. Das nicht-individuelle Motiv kann ein Buchstabe, ein Wort, ein Logo oder ein Symbol sein. Enthält das Motiv größere Flächen, sollten nur die Umrisse dieser Flächen das Motiv bilden, damit das Motiv insgesamt nur aus feinen Linien aufgebaut ist.The non-individual motif may be a pattern of fine lines, such as: As concentric rings or a check pattern there are. The non-individual motif can be a letter, a word, a logo or a symbol. If the motif contains larger areas, only the outlines of these areas should form the motif so that the motif is composed entirely of fine lines.
Die Erfindung beruht darauf, dass sowohl das nicht-individuelle als auch das individuelle Motiv in wenigstens einem optischen Sicherheitselement erkennbar bleiben. Durch die oben beschriebene Anordnung entsteht überraschenderweise eine Art Kippeffekt für den Betrachter des optischen Sicherheitselementes. In einem Betrachtungswinkel und bei einer Beleuchtung, in dem bzw. bei der das nicht-individuelle Motiv der Prägestruktur nicht schillert, tritt das individuelle Motiv der laserlithographischen Struktur in den Vordergrund und ist für einen menschlichen Betrachter fast störungsfrei lesbar, als wären die Aussparungen nicht vorhanden. Dies liegt daran, dass die Aussparungen durch die geringe Linienbreite des nicht-individuellen Motivs dem Betrachter praktisch nicht auffallen.The invention is based on the fact that both the non-individual and the individual motif remain recognizable in at least one optical security element. The arrangement described above surprisingly produces a kind of tilting effect for the viewer of the optical security element. In a viewing angle and in an illumination in which the non-individual motif of the embossed structure does not dazzle, the individual motif of the laser lithographic structure comes to the fore and is almost trouble-free readable for a human observer, as if the recesses were not present , This is because the recesses are virtually unnoticeable by the small line width of the non-individual motif to the viewer.
In einem Betrachtungswinkel und bei einer Beleuchtung, in dem bzw. bei der das nicht-individuelle Motiv der Prägestruktur schillert, tritt aber das nicht-individuelle Motiv der Prägestruktur in den Vordergrund und scheint für den menschlichen Betrachter über dem individuellen Motiv der laserlithographischen Struktur zu liegen. Die beiden Ansichten wechseln, wenn das optische Sicherheitselement gekippt wird.However, at a viewing angle and with illumination in which the non-individual motif of the embossment pattern dazzles, the non-individual motif of the embossment structure comes to the fore and seems to be above the individual motif of the laser lithographic structure for the human observer , The two views change when the optical security element is tilted.
Um den erfindungsgemäßen fälschungssicheren Träger mit wenigstens einem optischen Sicherheitselement herzustellen, ist einerseits eine Auflösung eines laserlithographischen Verfahrens notwendig, um die Aussparungen in der Größenordnung von kleiner als 250 µm aufbringen zu können, andererseits ist eine sehr gute Passergenauigkeit zwischen den nicht-individuellen Motiven und den individuellen Motiven notwendig. Hierzu muss während des Herstellungsverfahrens die Position des nicht-individuellen Motivs aufgenommen werden, z. B. mittels einer Passermarke, und das individuelle Motiv muss mittels des laserlithographischen Verfahrens entsprechend der aufgenommenen Position passergenau in die metallisierte Schicht eingebracht werden.In order to produce the counterfeit-proof carrier according to the invention with at least one optical security element, on the one hand a resolution of a laser-lithographic one Method necessary to apply the recesses in the order of less than 250 microns, on the other hand, a very good registration between the non-individual motifs and the individual motifs is necessary. For this purpose, the position of the non-individual motif must be recorded during the manufacturing process, for. B. by means of a registration mark, and the individual motif must be introduced by means of the laser-lithographic process according to the recorded position registration into the metallized layer.
Ist die Passergenauigkeit bei der Herstellung nicht gegeben, so wird das nicht-individuelle Motiv durch das individuelle Motiv des laserlithographischen Verfahrens in Teilen zerstört bzw. unsichtbar gemacht, und der Kippeffekt ist nicht oder zumindest nicht voll wirksam. Während der Herstellung können Produktionstoleranzen auftreten, also leichte Passerversätze zwischen dem nicht-individuellen Motiv der Prägestruktur und dem individuellen Motiv der laserlithographischen Struktur den Kippeffekt zerstören. Solche Produktionstoleranzen werden bei der Gestaltung der Sicherheitselemente vorzugsweise berücksichtigt.If the register accuracy is not given in the production, the non-individual motif is partially destroyed or made invisible by the individual motif of the laser lithographic process, and the tilting effect is not or at least not fully effective. During production, production tolerances can occur, ie slight register errors between the non-individual motif of the embossed structure and the individual motif of the laser lithographic structure destroy the tilting effect. Such production tolerances are preferably taken into account in the design of the security elements.
Wenn die maximale Passerabweichung des Produktionsprozesses zwischen den beiden Motiven bekannt ist, so kann die maximale Passerabweichung der Linienbreite des nicht-individuellen Motivs der Prägestruktur aufgeschlagen werden. Die Linienbreite wird um den Betrag der maximalen Abweichung vergrößert. Die Aussparungen der laserlithographischen Struktur behalten jedoch ihre ursprüngliche Breite bei, sind also gestaltet, als seien die Linien des nicht-individuellen Motivs der Prägestruktur gar nicht verbreitert worden. Weicht im Herstellungsverfahren die Position des individuellen Motivs der laserlithographischen Struktur von der Position des nicht-individuellen Motivs der Prägestruktur ab, so ist an den Aussparungen immer noch die Linie des nicht-individuellen Motivs der Prägestruktur vorhanden. Der Kippeffekt bleibt weiterhin wirksam. Nachteilig daran ist natürlich, dass die Linien verbreitert sind. Es können mit diesem Verfahren und der Linienverbreiterung aber dennoch kleinere Passerabweichungen kompensiert werden. Die Passerabweichungen sollten im Bereich von +/- 100 µm liegen, bevorzugt +/- 50 µm.If the maximum registration error of the production process between the two motifs is known, then the maximum registration deviation of the line width of the non-individual motif of the embossed structure can be opened. The line width is increased by the amount of the maximum deviation. However, the recesses of the laser lithographic structure retain their original width and are thus designed as if the lines of the non-individual motif of the embossed structure had not been broadened at all. In the manufacturing process, if the position of the individual motif of the laser lithographic structure deviates from the position of the non-individual motif of the embossed structure, the recesses still have the line of the non-individual motif of the embossed structure. The tilt effect remains effective. The disadvantage of this is, of course, that the lines are widened. However, this method and the line broadening can still compensate for smaller register deviations. The register deviations should be in the range of +/- 100 μm, preferably +/- 50 μm.
Für die Berücksichtigung der Herstellungstoleranzen bei der Gestaltung der Motive wird alternativ die Passerabweichung der Breite der Aussparungen der laserlithographischen Struktur zugeschlagen. Weicht im Herstellungsverfahren die Position des individuellen Motivs der laserlithographischen Struktur von der Position des nicht-individuellen Motivs der Prägestruktur ab, so ist an den größeren Aussparungen immer noch die Linie des nicht-individuellen Motivs der Prägestruktur vorhanden. Auch hier bleibt der Kippeffekt weiterhin wirksam.In order to take account of the manufacturing tolerances in the design of the motifs, alternatively the register deviation is added to the width of the recesses of the laser lithographic structure. In the manufacturing process, if the position of the individual motif of the laser lithographic structure deviates from the position of the non-individual motif of the embossed structure, the larger recesses still have the non-individual line Motive of the embossed structure available. Again, the tipping effect remains effective.
Die hohe Auflösung des Laser-Lithographieverfahrens und die hohen Anforderungen bei der Passergenauigkeit stellen eine große Hürde für die Fälschung der optischen Sicherheitselemente dar.The high resolution of the laser lithography process and the high demands on the register accuracy represent a major obstacle to the forgery of the optical security elements.
Hinsichtlich des Verfahrens wird die Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 11 gelöst.With regard to the method, the object is achieved by a method having the features of claim 11.
Die Aufgabe wird durch ein Verfahren zur Herstellung eines fälschungssicheren Trägers mit wenigstens einem optischen Sicherheitselement gelöst, indem das optische Sicherheitselement einen optischen Kippeffekt erzeugt, indem ein nicht-individuelles Motiv in eine metallisierte Schicht geprägt wird und dabei auf dem nicht-individuellen Motiv eine diffraktive Oberflächenstruktur erzeugt wird und ein individuelles Motiv laserlithographisch in die metallisierte Schicht eingebracht wird und dabei Aussparungen in dem individuellen Motiv erzeugt werden, die zumindest ein Teilmotiv des nicht-individuellen Motivs ausformen. Die Aussparungen werden passergenau auf dem nicht-individuellen Motiv angeordnet. Dabei wird zunächst in die metallisierte Schicht ein nicht-individuelles Motiv beispielsweise in Form von konzentrischen Ringen, einem anderen mathematischen Muster oder einem Logo geprägt. Dazu wird ein Stempel, vorzugsweise ein Masterprägestempel verwendet, der fortwährend beispielsweise entlang eines länglichen Trägers in bestimmten Abständen nicht-individuelle Motive in die metallisierte Schicht einprägt. Der Stempel ist dabei so genau gearbeitet, dass in die metallisierte Schicht eine Oberflächenstruktur eingebracht wird, die ein Beugungsgitter im sichtbaren Licht erzeugt oder eine Überlagerung mehrerer Beugungsgitter im sichtbaren Licht erzeugt. Das Beugungsgitter führt zu einem schillerndem Effekt und dem Sichtbarwerden des nicht-individuellen Motivs bei bestimmten Betrachtungswinkeln, die dem Beugungswinkel verschiedener Ordnung entsprechen.The object is achieved by a method for producing a tamper-resistant carrier with at least one optical security element in that the optical security element generates a tilting optical effect by embossing a non-individual motif into a metallized layer and thereby forming a diffractive surface structure on the non-individual motif is generated and an individual motif is laser lithographically introduced into the metallized layer and thereby recesses are generated in the individual motif, which form at least a partial motif of the non-individual motif. The recesses are arranged in registration on the non-individual motif. In the process, a non-individual motif, for example in the form of concentric rings, another mathematical pattern or a logo, is first embossed in the metallized layer. For this purpose, a stamp, preferably a master embossing die is used, which permanently imprints non-individual motifs in the metallized layer, for example along an elongate support at specific intervals. The stamp is worked so accurately that in the metallized layer, a surface structure is introduced, which generates a diffraction grating in visible light or generates a superposition of multiple diffraction gratings in the visible light. The diffraction grating results in a dazzling effect and the visibility of the non-individual subject at certain viewing angles corresponding to the diffraction angle of different order.
Vorzugsweise anschließend wird in dieselbe metallisierte Schicht laserlithographisch ein weiteres, aber individuelles Motiv eingebrannt. Die metallisierte Schicht wird laserlithographisch jedoch so behandelt, dass die Oberflächenstruktur des nicht-individuellen Motivs erhalten bleibt und gleichsam nur die Zwischenräume zwischen den konzentrischen Linien oder anderen Linien des nicht-individuellen Motivs laserlithographisch behandelt werden. Die Linien des individuellen Motivs und die Bereiche des individuellen Motivs, die laserlithographisch behandelt werden, sind in ihren Abmessungen deutlich größer, d. h. im Millimeterbereich und damit beim Betrachten des optischen Sicherheitselementes außerhalb der Beugungswinkel dominant sichtbar.Preferably, a further, but individual motif is then laser-lithographed in the same metallized layer. However, the metallized layer is laser-lithographically treated so as to preserve the surface structure of the non-individual motif and, as it were, to laser-lithograph only the spaces between the concentric lines or other lines of the non-individual motif. The lines of the individual motif and the areas of the individual motif, which are laser-lithographically treated, are significantly larger in their dimensions, ie in the millimeter range and thus when viewing the optical security element outside the diffraction angle is visibly visible.
Die Erfindung wird anhand von vier Ausführungsbeispielen in siebzehn Figuren beschrieben, dabei zeigen:
- Fign. 1a bis 1d
- ein Grundprinzip eines Aufbaus eines erfindungsgemäßen fälschungssicheren Trägers mit einem optischen Sicherheitselement,
- Fign. 2a bis 2d
- ein optisches Sicherheitselement bestehend aus QR-Code und konzentrischen Ringen,
- Fig. 3
- ein übereinandergelagertes nicht-individuelles und individuelles Motiv mit einem Passerversatz,
- Fign. 4a bis 4d
- einen Träger mit einem Sicherheitselement mit einem nicht-individuellen Motiv, dessen konzentrische Ringe breiter als die Breite der Aussparungen des individuellen Motivs sind,
- Fign. 5a bis 5d
- einen Träger mit einem Sicherheitselement mit einem individuellen Motiv, dessen Aussparungen breiter als die konzentrischen Ringe des nicht- individuellen Motivs sind.
- FIGS. 1a to 1d
- a basic principle of a structure of a tamper resistant carrier according to the invention with an optical security element,
- FIGS. 2a to 2d
- an optical security element consisting of a QR code and concentric rings,
- Fig. 3
- a superimposed non-individual and individual motif with a Passerversatz,
- FIGS. 4a to 4d
- a carrier having a security element with a non-individual motif whose concentric rings are wider than the width of the recesses of the individual motif,
- FIGS. 5a to 5d
- a carrier with a security element with an individual motif whose recesses are wider than the concentric rings of the non-individual motif.
Die
In
Wenn das optische Sicherheitselement 6 gemäß
Die
In den
Um dennoch den erfindungsgemäßen Kippeffekt zu erzeugen, werden die Linien des nicht-individuellen Motivs 2 um eine Passerabweichung entlang ihres gesamten Umfanges gleichmäßig verbreitert. Die um die Passerabweichung verbreiterten Linien sind in
In den
- 11
- individuelles Motivindividual motive
- 22
- nicht-individuelles Motivnon-individual motif
- 33
- diffraktive Oberflächediffractive surface
- 44
- Aussparungenrecesses
- 66
- optisches Sicherheitselementoptical security element
Claims (14)
- Anti-counterfeit carrier having a series of optical security elements (6) and having a metallized layer, into which in each case a non-individual motif (2) with a diffractive surface (3) is embossed for at least two of the optical security elements (6) and in which in each case an individual motif (1) is introduced by laser lithography,
characterized in that the individual motif (1) has cutouts (4) that form at least a partial motif of the non-individual motif (2) and are arranged in exact register with respect to the non-individual motif (2),
and said at least two optical security elements (6) have in each case an optical tilt effect between the individual motif (1) and the non-individual motif (2) . - Anti-counterfeit carrier according to Claim 1, characterized in that, due to the tilt effect, the individual motif (1) comes to the foreground at specific viewing angles and the non-individual motif (2) comes in the foreground at other viewing angles and appears to be overlaying the individual motif (1).
- Anti-counterfeit carrier according to Claim 1 or 2, characterized in that the non-individual motif (2) has fine lines.
- Anti-counterfeit carrier according to Claim 3, characterized in that a width of the fine lines is less than 250 µm.
- Anti-counterfeit carrier according to one of the preceding claims,
characterized in that the cutouts (4) are widened by a value of a register deviation. - Anti-counterfeit carrier according to one of Claims 1 to 4,
characterized in that lines of the non-individual motif (2) are widened by the value of the register deviation. - Anti-counterfeit carrier according to one of the preceding claims,
characterized in that the non-individual motif (2) comprises a logo, a drawing, lettering, a symbol or a regular pattern. - Anti-counterfeit carrier according to one of the preceding claims,
characterized in that the individual motif (1) is text, in particular a serial number or part of a serial number. - Anti-counterfeit carrier according to one of the preceding claims,
characterized in that the individual motif (1) is a barcode, in particular a data matrix code or a QR code. - Anti-counterfeit carrier according to one of the preceding claims,
characterized in that the non-individual motifs (2) in the series are identical and the individual motifs (1) in the series differ from one another. - Method for producing an anti-counterfeit carrier having a series of optical security elements (6), of which at least two in each case produce an optical tilt effect, by way of non-individual motifs (2) being embossed into a metallized layer and by a diffractive surface (3) being produced on the non-individual motifs (2) in the process, individual motifs (1) being introduced into the metallized layer by laser lithography and cutouts (4) being produced in the individual motifs (1) in the process that each form at least a partial motif of the non-individual motif (2) and are arranged in exact register on the non-individual motif (2).
- Method according to Claim 11,
characterized in that the cutouts (4) are widened by a value of a register deviation. - Method according to Claim 11,
characterized in that lines of the non-individual motif (2) are widened by the value of the register deviation. - Method according to one of Claims 11 to 13,
characterized in that the non-individual motifs (2) are produced in a mass replication method using a master stamp.
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DE102015210982.8A DE102015210982A1 (en) | 2015-06-15 | 2015-06-15 | Safety label with tilting effect |
PCT/EP2016/063716 WO2016202840A1 (en) | 2015-06-15 | 2016-06-15 | Security label with tilt effect |
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EP3307551A1 EP3307551A1 (en) | 2018-04-18 |
EP3307551B1 true EP3307551B1 (en) | 2019-03-20 |
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EP (1) | EP3307551B1 (en) |
CN (1) | CN107771129B (en) |
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DE102005003958A1 (en) * | 2005-01-27 | 2006-08-03 | Giesecke & Devrient Gmbh | Security element, especially for valuable document, has reflective layer with areas that interact differently with laser radiation so reflective layer optical characteristic modification of one area enables visual characteristic recognition |
DE102005007749A1 (en) | 2005-02-18 | 2006-08-31 | Giesecke & Devrient Gmbh | Security element for protecting valuable objects, e.g. documents, includes focusing components for enlarging views of microscopic structures as one of two authenication features |
DE102005028162A1 (en) * | 2005-02-18 | 2006-12-28 | Giesecke & Devrient Gmbh | Security element for protecting valuable objects, e.g. documents, includes focusing components for enlarging views of microscopic structures as one of two authenication features |
DE102005027380B4 (en) * | 2005-06-14 | 2009-04-30 | Ovd Kinegram Ag | The security document |
DE102008058397A1 (en) * | 2008-11-21 | 2010-05-27 | Giesecke & Devrient Gmbh | Value document with matt and glossy surface areas and method for its production |
CN101905588A (en) * | 2009-06-03 | 2010-12-08 | 中国人民银行印制科学技术研究所 | Light variation anti-forgery element with multiple anti-forgery functions |
DE102009040975A1 (en) * | 2009-09-11 | 2011-03-24 | Ovd Kinegram Ag | Multi-layer body |
AU2011100315B4 (en) | 2011-03-22 | 2011-09-08 | Innovia Security Pty Ltd | Security element |
DE102011117677A1 (en) | 2011-11-04 | 2013-05-08 | Giesecke & Devrient Gmbh | Optically variable security element |
DE102012203350A1 (en) * | 2012-03-02 | 2013-09-05 | Tesa Scribos Gmbh | Security label and a method for its production |
DE102012219473A1 (en) | 2012-10-24 | 2014-05-08 | Tesa Scribos Gmbh | Device and method for the production of security labels and security labels |
US20150360500A1 (en) * | 2013-02-19 | 2015-12-17 | Innovia Security Pty Ltd | Security Device with Covert Images |
JP2015074190A (en) | 2013-10-10 | 2015-04-20 | 大日本印刷株式会社 | Manufacturing method of transfer original plate for security card, and manufacturing method of security card |
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2015
- 2015-06-15 DE DE102015210982.8A patent/DE102015210982A1/en not_active Withdrawn
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DE102015210982A1 (en) | 2016-12-15 |
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CN107771129B (en) | 2020-02-07 |
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