EP3956148A1 - Bloqueurs d'ablation - Google Patents

Bloqueurs d'ablation

Info

Publication number
EP3956148A1
EP3956148A1 EP20716531.7A EP20716531A EP3956148A1 EP 3956148 A1 EP3956148 A1 EP 3956148A1 EP 20716531 A EP20716531 A EP 20716531A EP 3956148 A1 EP3956148 A1 EP 3956148A1
Authority
EP
European Patent Office
Prior art keywords
electromagnetic radiation
protection structure
data carrier
processing
spectrum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20716531.7A
Other languages
German (de)
English (en)
Inventor
Stefan Egli
Jonas Mueller
Thomas Neuenschwander
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.)
Thales DIS France SAS
Original Assignee
Thales DIS France SA
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 Thales DIS France SA filed Critical Thales DIS France SA
Priority claimed from PCT/EP2020/060343 external-priority patent/WO2020212289A1/fr
Publication of EP3956148A1 publication Critical patent/EP3956148A1/fr
Pending legal-status Critical Current

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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • 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
    • B42D13/00—Loose leaves modified for binding; Inserts
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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 present invention relates to a data carrier according to the preamble of claim 1 , a security document comprising such a data carrier and the use of such a data carrier for producing a security document according to claims 1 1 and 12, respectively. It furthermore relates to a method of producing a data carrier according to claim 13.
  • Said see-through portion comprises two or more metallic layers which are provided with a security feature such as a personalization by means of a laser ablation process.
  • a security feature such as a personalization by means of a laser ablation process.
  • the underlying metallic layer is unintentionally slightly ablated, too. This is caused by the fact that part of the induced laser energy penetrates the upper metallic layer and impinges on the underlying metallic layer, whereby an at least partial ablation of the underlying metallic layer is caused.
  • An adjustment of the laser power does not prevent an ablation of the underlying metallic layer. This unintentional damage of the underlying metallic layer decreases the contrast and functionality of the security feature.
  • a data carrier which comprises in this sequence along a first direction: a cover layer, at least a first processing layer and a second processing layer, and a base layer.
  • the first and second processing layers are configured to be processed by means of electromagnetic radiation.
  • the data carrier further comprises at least one protection structure which is arranged between the first and second processing layers.
  • the protection structure is configured such that, upon irradiation of electromagnetic radiation constituting a first spectrum along the first direction, the protection structure essentially entirely prevents said electromagnetic radiation from impinging on the second processing layer.
  • the data carrier can be processed by irradiating electromagnetic radiation constituting a spectrum composed of one or more particular wavelengths, wherein the protection structure allows an impingement of said radiation only on the first, i.e. upper processing layer but prevents an impingement on the second, i.e. underlying processing layer.
  • the protection structure can thus be seen as a blockage or barrier that eliminates electromagnetic radiation which is used to process the first processing layer and which passes the first processing layer towards the underlying second processing layer. In this way, the contrast of information introduced into the data carrier by means of the electromagnetic irradiation is enhanced and, as a result, a data carrier having an increased level of security is obtained.
  • An essentially entire prevention in the context of the present invention means that typically more than 80%, preferably more than 90% of the impinging electromagnetic radiation is blocked by the processing structure.
  • the electromagnetic radiation preferably corresponds to monochromatic radiation, particularly preferably to laser radiation, wherein the irradiation of laser radiation on the first processing layer results in an at least partial ablation of the first processing layer.
  • the first processing layer is modified, wherein the modified region, potentially together with unmodified regions on the first processing layer and the unprocessed second processing layer, can represent a security feature such as personalized data.
  • Conceivable personalized data are graphical data, e.g. an image or a logo, or alphanumerical data, such as a name or a date of birth of the owner of the data carrier or machine-readable data, such as a barcode, respectively.
  • the protection structure can be configured such that, upon irradiation of the electromagnetic radiation constituting the first spectrum along a second direction running opposite to the first direction, the protection structure essentially entirely prevents said electromagnetic radiation from impinging on the first processing layer.
  • the protection structure acts as a barrier or blockage for the respectively underlying processing layer with regard to an irradiation of the wavelength(s) constituting the first spectrum from both sides of the data carrier, i.e. against irradiation from a front side of the data carrier, wherein the irradiation propagates along the first direction extending from the cover layer towards the base layer, as well as against irradiation from a back side of the data carrier, wherein the irradiation propagates along the second direction extending from the base layer towards the cover layer.
  • the first processing layer is processed from the front side and the second processing layer is processed from the back side of the data carrier, wherein the processing of one of the processing layers does not affect the other processing layer.
  • the present invention is thus also very suitable for the provision of security features based on filters, such as Moire-patterns.
  • the protection structure is preferably configured such that, upon irradiation of electromagnetic radiation constituting a second spectrum being different from the first spectrum along the first direction, the protection structure allows said electromagnetic radiation to impinge on the first processing layer and on the second processing layer.
  • the protection structure can be configured such, that upon irradiation of electromagnetic radiation constituting the second spectrum along the second direction, the protection structure allows said electromagnetic radiation to impinge on the second processing layer and on the first processing layer.
  • the protection structure is preferably wavelength-specific. That is to say, the protection structure can be configured such that it allows the transmission of electromagnetic radiation of one or more particular wavelengths but at the same time prevents the transmission of electromagnetic radiation of other one or more wavelengths.
  • the protection structure can be configured such that it allows the transmission of electromagnetic radiation of one or more particular wavelengths but at the same time prevents the transmission of electromagnetic radiation of other one or more wavelengths.
  • the protection structure can be configured to absorb impinging electromagnetic radiation constituting the first spectrum.
  • Such a protection structure has the function of an optical filter and allows electromagnetic radiation of particular wavelengths to pass and at the same time prevents the propagation of electromagnetic radiation having other particular wavelengths.
  • the protection structure can comprise one or more additives and/or one or more pigments and/or one or more dyes and/or one or more inks that are configured to absorb impinging electromagnetic radiation constituting the first spectrum, the protection structure being preferably configured to absorb in the ultraviolet region and/or in the infrared region.
  • a protection structure which is essentially transparent in visible light.
  • additives and inks can be used and which are well known to the person skilled in the art.
  • An example of an additive which absorbs electromagnetic radiation in the ultraviolet region is based on a 2- hydroxyphenyl-s-triazine derivative such as the commercially available Tinuvin® 1600 from BASF.
  • Examples of inks which absorb in the infrared region are the commercially available spectraCARD IRB from Printcolor or MSD4800 or MSC3600 from H. W. Sands.
  • the protection structure is provided by means of additives it is preferred to apply them in the form of a matrix comprising them.
  • the additives can be dispersed into a polymer matrix by using standard extrusion equipment.
  • a protection structure in the form of an ink can be applied directly onto the base layer or the cover layer, for example.
  • the protection structure can be configured to reflect impinging electromagnetic radiation constituting the first spectrum, the protection structure preferably being configured to fully reflect or diffusely reflect impinging electromagnetic radiation constituting the first spectrum, or the protection structure can be configured to diffusely transmit impinging electromagnetic radiation constituting the first spectrum.
  • a full reflection occurs when the angle of light incident on the protection structure equals the angle of the light reflected from the protection structure.
  • a diffuse reflection also known as scattered reflection, refers to the scattering of incident light at many angles.
  • the protection structure can be seen as a diffraction grating or an optical grating.
  • a scattered transmission means that the power of the impinging electromagnetic radiation is reduced by the protection structure such, that a processing of the processing layer lying beneath the protection structure by means of the transmitted electromagnetic radiation is prevented.
  • the protection structure can comprise periodical structures that are configured to diffract impinging electromagnetic radiation constituting the first spectrum, or the protection structure can comprise nanoparticles, such that impinging electromagnetic radiation constituting the first spectrum is scattered on a surface of the nanoparticles.
  • a protection structure in the form of nanoparticles can be provided by means of nanoparticles embedded in a matrix, preferably in a plastic matrix. Conceivable nanoparticles are silicon dioxide (S1O2) and titanium dioxide (T1O2) nanoparticles, for example.
  • the blockage or barrier provided by means of the protection structure can be based on the reflection, the transmission or the absorption of the electromagnetic radiation being irradiated in order to process the processing layers, wherein said reflection, transmission or absorption depends on the particular wavelength of the irradiated electromagnetic radiation and the intrinsic properties of the protection structure.
  • the size and the composition of the nanoparticles can be used to effectuate a diffraction of electromagnetic radiation of particular wavelength(s).
  • a reflection, transmission or absorption occurring for electromagnetic radiation of particular wavelength(s) can be set based on the shape of the periodical structures provided on the protection structure or the chemical composition or the thickness of the protection structure.
  • the protection structure can be provided in the form of one or more layers, wherein said one or more layers extends at least partially between the first and second processing layers along an extension direction, the protection structure preferably being provided in the form of an optical multilayer structure, such that impinging electromagnetic radiation is blocked by interference phenomena.
  • a protection structure in the form of a single layer that fully extends between the first and second processing layers and thereby completely separates the first and second processing layers from one another.
  • the provision of two or more layers constituting the protection structure is likewise conceivable, wherein said two or more layers can be arranged adjacent to one another with respect to the extension direction.
  • the two or more layers differ in their intrinsic properties such that they act as a barrier or blockage for different wavelengths.
  • the protection structure in the form of an optical multilayer structure, i.e. as several thin multilayer structures, wherein the thin multi-layer structures effectuate a thin-film interference of the impinging electromagnetic radiation.
  • the waves composing the electromagnetic radiation are reflected by the upper and lower boundaries of the protection structure and interfere with one another such that they eliminate each other.
  • the first and/or second processing layers preferably comprise one or more metals or metal-compounds, and/or the cover layer and/or the base layer are preferably transparent and preferably made of plastics, particularly preferably made from a polycarbonate or from a polyethylene terephthalate.
  • Metals, metal-compounds or pigments that are ablated or bleached upon irradiation with electromagnetic radiation are conceivable.
  • a security feature such as a colored personalization
  • a colored metal, metal- compound pigment should be used.
  • metals can be selected from Al, Cu, Au, Ag, Ti or combinations thereof and conceivable metal- compounds can be selected from TiN, TiCN, CrN, ZrN, TiZrN, ZrCN, TiC, TiCrN, AITiN, TiAIN, diamond like carbon or combinations thereof.
  • Conceivable pigments or colorants are pigments or colorants that are commonly used in the field of the invention, such as the pigments disclosed in EP0327508, W09635585 or WO0136208.
  • the cover layer and the base layer should be provided in transparent materials such as polycarbonate or polyethylene terephthalate mentioned above.
  • transparent materials such as polycarbonate or polyethylene terephthalate mentioned above.
  • polycarbonate polyethylene terephthalate
  • PET polyethylene terephthalate
  • the base layer could be provided as opaque material.
  • plastic sheets with filler media typically titanium dioxide (T1O2) (standard opaque white PC sheets) are used.
  • the data carrier can comprise three or more processing layers and two or more protection structures, wherein the processing layers and the protection structures are preferably arranged alternating along the first direction. In this case it is preferred that the protection structures differ in their wavelength-selectivity.
  • the data carrier can comprise three processing layers, wherein the first protection structure is arranged between the first and the second processing layer and a second protection structure is arranged between the second and the third processing layer. It is then preferred that the first protection structure is selectively blocking the first wavelength and that the second protection structure is selectively blocking a second wavelength being different from the first wavelength.
  • the first processing layer can be processed with electromagnetic radiation constituting the first spectrum while the underlying second and third processing layers are protected by the first protection structure and the second processing layer can be processed with electromagnetic radiation constituting the second spectrum while the underlying third processing layer is protected, for example.
  • a security document comprising a data carrier as described above is provided, the security document preferably being an identity card, a passport, a credit card, a bank note or the like.
  • the data carrier per se can correspond to a security document. This is the case if the data carrier is provided in the form of an identity card, for example. However, it is likewise conceivable to introduce or incorporate the data carrier into a security document.
  • the data carrier could correspond to a page of the passport, wherein said page is made of plastics, i.e. the cover layer and the base layer, within which the processing layers and the one or more protection structures are arranged. A colored picture of the passport owner can then be provided by means of particularly modified processing layers, for example.
  • a data carrier as described above is used for producing a security document.
  • a security document can be produced by first laminating the“raw”, i.e. unpersonalized data carrier into a security document such as a passport or the like and by then processing the processing layers with electromagnetic radiation in order to personalize it.
  • it is also conceivable to produce a security document by first processing the processing layers with electromagnetic radiation and by then laminating the thus personalized data carrier into a security document such as a passport or the like.
  • a method of producing a data carrier preferably a data carrier as described above, is provided, the method comprising the steps of:
  • the protection structure being configured such that, upon irradiation of electromagnetic radiation constituting a first spectrum along the first direction, the protection structure essentially entirely prevents said electromagnetic radiation from impinging on the second processing layer.
  • the protection structure protects underlying processing layers by being a barrier or blockage for electromagnetic radiation constituting a spectrum comprised of one or more particular wavelengths.
  • the method allows the production of data carriers with high contrast and thus increased security.
  • Electromagnetic radiation constituting the first spectrum can be irradiated along the first direction in order to at least partially ablate the first processing layer, and/or electromagnetic radiation constituting the first spectrum can be irradiated along a second direction running opposite to the first direction in order to at least partially ablate the second processing layer, wherein the protection structure essentially entirely prevents said electromagnetic radiation from impinging on the first processing layer.
  • Electromagnetic radiation constituting a second spectrum being different from the first spectrum can be irradiated along the first direction in order to at least partially ablate the second processing layer, and/or the electromagnetic radiation constituting the second spectrum can be irradiated along the second direction in order to at least partially ablate the first processing layer.
  • the protection structure acts as a barrier or blockage for the respectively underlying processing layer with regard to an irradiation of the particular wavelength(s) it is sensitive to from both sides of the data carrier.
  • two or more protection structures that are in each case arranged between successive processing layers. These two or more protection structures are then preferably selective for one particular wavelength only, wherein the two or more particular wavelengths differ from one another.
  • a fiber laser or crystal based solid state laser emitting at a wavelength of 1064 nm or 355 nm is selected.
  • a conceivable thickness of the processing layer lies in the range of about 10 nanometer to 50 micrometer.
  • a conceivable thickness of a metallic or metal-compound comprising processing layer is about 20 nanometer, and a processing layer comprising pigments typically has a thickness of about 4 micrometer.
  • the protection structure preferably has a thickness in the range of about 1 to 500 micrometer.
  • a protection structure being configured as a diffraction grating or an optical grating is used, a preferred thickness is 2 micrometer.
  • a typical thickness corresponds to 40 micrometer.
  • a protection structure comprising absorbing additives or a protection structure comprising nanoparticles dispersed in a matrix typically has a thickness of about 100 micrometer.
  • Fig. 1 a shows a schematic representation of a data carrier according to a first embodiment in an unprocessed state
  • FIG. 1 b shows a schematic representation of the data carrier according to figure 1 a during processing
  • FIG. 1 c shows a schematic representation of the data carrier according to figure 1 a after processing
  • Fig. 2 shows a schematic representation of a data carrier according to a second embodiment
  • Fig. 3 shows a schematic representation of a data carrier according to a third embodiment
  • Fig. 4 shows a schematic representation of a data carrier according to a fourth embodiment
  • Fig. 5 shows a schematic representation of different processing possibilities of a fictitious data carrier according to a fifth embodiment
  • Fig. 6a shows a schematic representation of a data carrier according to a sixth embodiment in an unprocessed state
  • Fig. 6b shows a schematic representation of the data carrier according to figure 6a during a first processing step
  • Fig. 6c shows a schematic representation of the data carrier according to figure 6b during a second processing step
  • Fig. 6d shows a schematic representation of the data carrier according to figure 6a after processing
  • Fig. 7 shows a schematic representation of a data carrier according to a seventh embodiment
  • Fig. 8 shows a schematic representation of a data carrier according to an eight embodiment
  • Fig. 9 shows a schematic representation of a data carrier according to a ninth embodiment.
  • Each data carrier 1 comprises a cover layer 2 and a base layer 3, wherein two processing layers 4a, 4b and one protection structure 5a (see figures 1 a to 5 and figure 8 to 9) or four processing layers 4a, 4b, 4c, 4d and three protecting structures 5a, 5b, 5c (see figures 6a to 7) are arranged between the cover layer 2 and the base layer 3, respectively.
  • the different embodiments shown here mainly differ in the number of processing layers and protecting structures, their composition, as well as in the processing of the processing layers. This is now explained in greater detail with respect to the individual figures.
  • the data carrier 1 comprises, in this sequence along a first direction d1 , a cover layer 2, a first processing layer 4a, a protection structure 5a, a second processing layer 4b, and a base layer 3.
  • the cover layer 2 and the base layer 3 are provided made from plastics, here from polycarbonate (PC) or polyethylene terephthalate (PET). That is, both layers 2, 3 are essentially transparent or include printed elements. However, it is likewise conceivable to provide the base layer 3 in white or colored, for example as opaque layer.
  • the processing layers 4a, 4b are metallic layers and the protection structure 5a in this example corresponds to an ink that is applied between the processing layers 4a, 4b along an extension direction E.
  • the ink 5a is applied along an entire length of the processing layers 4a, 4b. That is, the processing layers 4a, 4b are completely separated from each other by the protection structure 5a.
  • two opaque areas 6 are provided sideways to the processing layers 4a, 4b and the protection structure 5a and, with respect to the extension direction E, before and after the processing layers 4a, 4b and the protection structure 5a. Said opaque areas 6 serve the purpose of optically separating the front and back side of the document or containing electronical parts and devices.
  • FIG 1 b the irradiation of electromagnetic radiation R along the first direction d1 as well as the irradiation of electromagnetic radiation R along a second direction d2 running opposite to the first direction d1 is shown.
  • the electromagnetic radiation R irradiated along the first direction d1 ablates the first processing layer 4a
  • the electromagnetic radiation R irradiated along the second direction d2 ablates the second processing layer 4b.
  • the protection structure 5a prevents the electromagnetic radiation R from impinging on the second processing layer 4b and in the latter case the protection structure 5a prevents the electromagnetic radiation R from impinging on the first processing layer 4a, respectively.
  • the protection structure 5a acts as a barrier or blockage for the respectively underlying processing layer 4a, 4b with regard to an irradiation from both sides of the data carrier 1 .
  • the blocking of the electromagnetic radiation R is based on absorption of this radiation by the components constituting the protection structure 5a, i.e. the ink.
  • Said ink 5a could correspond to the inks spectraCARD IRB from Printcolor or MSD4800 and MSC3600 from H. W. Sands, which absorb in the infrared region of the electromagnetic spectrum.
  • the MSC3600 ink is based on an absorbing dye. The ink absorbs almost totally in the range of 800 nm to 1050 nm.
  • the irradiated electromagnetic radiation preferably corresponds to monochromatic radiation, particularly preferably to laser radiation, wherein the irradiation of laser radiation on the processing layers 4a, 4b results in an at least partial ablation, and here in a complete ablation of the processing layers 4a, 4b in the region of incident laser radiation.
  • monochromatic radiation particularly preferably to laser radiation
  • the irradiation of laser radiation on the processing layers 4a, 4b results in an at least partial ablation, and here in a complete ablation of the processing layers 4a, 4b in the region of incident laser radiation.
  • the modified regions 41 a, 41 b together with the unmodified regions 42a, 42b represent a security feature such as personalized data or optical filters.
  • Conceivable personalized data are graphical data, e.g. an image or a logo, or alphanumerical data, such as a name or a date of birth of the owner of the data carrier or machine- readable data, such as a barcode, respectively.
  • An optical filter could be a Moire- pattern, wherein a first part of the pattern is provided by means of the modified and unmodified regions 41 a, 42a on the first processing layer 4a and a second part of the pattern is provided by means of the modified and unmodified regions 41 b, 42b on the second processing layer 4b. Due to the fact that the protection structure 5a prevents an unintentional ablation of underlying processing layers, a precise production of a personalized or security-feature-bearing data carrier is enabled.
  • FIGS 2 to 4 different embodiments of a data carrier 1 comprising two processing layers 4a, 4b and one protection structure 5a are shown.
  • figure 2 disclose a data carrier 1 which further comprises an opaque area 6 that is arranged with respect to the first direction d1 between the second processing layer 4b and the base layer 3.
  • the first and second processing layers 4a, 4b comprise some congruent recesses 43a, 43b that were formed by ablation and through which the opaque layer 6 is unravelled.
  • These recesses 43a, 43b can be obtained by irradiating electromagnetic radiation constituting a spectrum of one or more wavelengths that can pass through the protection structure 5a.
  • the first processing layer 4a comprises some recesses 44a that are only present on said first processing layer 4a but which are not on the second processing layer 4b.
  • These recesses 44a can be obtained by irradiating electromagnetic radiation constituting a spectrum of one or more wavelengths that cannot pass through the protection structure 5a, e.g. because it is absorbed by the protection structure 5a.
  • the electromagnetic radiation is only irradiated along the first direction d1 , that is, along a direction extending from the cover layer 2 towards the base layer 3.
  • a data carrier 1 which essentially corresponds to the data carrier 1 according to figure 1 , with the exception that a lens filter arrangement 7 is arranged on the cover layer 2.
  • Said lens filter arrangement 7 serves the purpose of focussing incoming light onto particular regions of the security features. Hence, those parts of the security features where the incoming light has not been focussed to will not be illuminated.
  • This partial or selective illumination of the security feature confers the security feature a changing appearance, wherein the appearance changes in dependence of the viewing angle.
  • the filter arrangement can be produced on the data carrier during lamination of the data carrier. In doing so, the filter arrangement can be moulded from an embossing template onto the plastics constituting the cover layer 2 of the data carrier 1 .
  • the data carrier 1 shown in figure 4 essentially corresponds to the data carrier according to figure 1 , with the exception that a filter structure 8 is printed on the cover layer 2.
  • Said printed filter structure 8 serves the same purpose as the filter arrangement 7 according to figure 3.
  • the filtering effect is realized by covering particular regions of the security feature and thus illuminating only a part of it.
  • the printed filter structure 8 can be printed onto the cover layer 2 prior to the lamination of the data carrier 1. To this end offset or screen printing are typically used.
  • a data carrier 1 comprising several kinds of protection structures 5a is depicted.
  • said data carrier 1 comprises a transparent cover layer 2 and a transparent base layer 3 as well as two opaque areas 6 as it is the case with the data carrier 1 according to figure 1 .
  • the protection structure 5a is provided in a fictitious and schematic manner for explanatory purposes.
  • the different kinds of protection structures are indicated by the segments 51 a-51 f, which segments are arranged between the first processing layer 4a and the second processing layer 4b and which segments have different properties.
  • a first segment 51 a corresponds to a protection structure 5a that comprises a material configured to fully reflect a particular wavelength.
  • the second segment 51 b corresponds to a protection structure 5a which is also configured to reflect electromagnetic radiation R of a particular wavelength.
  • the second segment 51 b reflects the incident radiation R at various defined angles.
  • both segments 51 , 51 b comprise a periodical structure provided on their surfaces, wherein said periodical structures are configured to fully reflect incident electromagnetic radiation R (first segment 51 a) or to deflect incident electromagnetic radiation R (second segment 51 b) of a particular wavelength.
  • first segment 51 a incident electromagnetic radiation
  • second segment 51 b deflect incident electromagnetic radiation
  • the third segment 51 c corresponds to a protection structure 5a which is configured to transmit impinging electromagnetic radiation R of a particular wavelength at various angles. Hence, if electromagnetic radiation R of said particular wavelength is irradiated, it will first ablate the first processing layer 4a and then impinge on the protection structure 51 c, where it is deflected by the protection structure 51 c while it passes through said protection structure 51 c. This deflection is caused by the intrinsic properties of the protection structure 51 c.
  • said protection structure 51 c can be understood as having a diffractive grid structure.
  • the transmitted radiation is deflected towards the second processing layer 4b.
  • the power of the deflected transmitted radiation is significantly smaller than the power of the incident radiation, the deflected radiation will not ablate the second processing layer 4b in case that it is deflected onto it.
  • the fourth segment 51 d corresponds to a protection structure 5a which comprises nanoparticles configured to diffusely scatter impinging electromagnetic radiation R of a particular wavelength.
  • electromagnetic radiation R of said particular wavelength if electromagnetic radiation R of said particular wavelength is irradiated, it will first ablate the first processing layer 4a and then impinge on the fourth segment 51 d, where it is scattered on the surfaces of the nanoparticles while it passes through said fourth segment 51 d. In the present situation the radiation is scattered in all directions. However, since the power of the scattered radiation is significantly smaller than the power of the incident radiation, the scattered radiation will not ablate the first or second processing layers 4a, 4b in case that it is deflected onto them.
  • the fifth and sixth segments 51 e, 51 f correspond to a protection structure 5a the incident electromagnetic radiation R is not sensitive to.
  • these segments 51 e, 51 f could correspond to an ink that absorbs at a particular wavelength, wherein the incident radiation R has a wavelength being different from said particular wavelength. Therefore, the incident radiation R can pass through these segments 51 e, 51 f without being deflected or scattered.
  • the power of the incident radiation R is not strong enough to ablate the second processing layer 4b after having ablated the first processing layer 4a and having passed the fifth segment 51 e
  • the power of the incident radiation R irradiated in the region of the sixth segment 51 f is indeed strong enough to ablate the first processing layer 4a as well as the second processing layer 4b after having passed the sixth segment 51 f.
  • the data carriers 1 according to figures 6a to 7 comprise four processing layers 4a, 4b, 4c, 4d and three protection structures 5a, 5b, 5c.
  • FIG. 6a the personalization of the data carrier 1 is depicted.
  • a personalization of the first and fourth processing layers 4a, 4d is achieved in a first step by irradiating electromagnetic radiation R along the first direction d1 in order to selectively ablate the first processing layer 4a and by irradiating electromagnetic radiation R along the second direction d2 in order to selectively ablate the fourth processing layer 4d as shown in figure 6b.
  • the first protection structure 5a arranged between the first and the second processing layers 4a, 4b and the third protection structure 5c arranged between the third and the fourth processing layers 4c, 4d block these irradiated radiations R, such that modified regions 41 a, 41 d are created only in the first and fourth processing layers 4a, 4d.
  • the wavelength of these irradiations R and thus also the wavelength-sensitivity of the first protection structure 5a and the third protection structure 5c are the same.
  • radiation R having a wavelength being different from the wavelength of the radiation R irradiated in the first step is irradiated onto the data carrier 1 along the first direction d1 and along the second direction d2.
  • This radiation R is irradiated at positions where the first and fourth processing layers 4a, 4d were already ablated in the first step.
  • this radiation R is of a wavelength that can pass through the first protection structure 5a and the third protection structure 5c, such that the second processing layer 4b lying with respect to the first direction d1 beneath the first processing layer 4a and the third processing layer 4c lying with respect to the second direction d2 beneath the fourth processing layer 4d are selectively ablated.
  • congruent recesses 43a, 43b in the first and second processing layers 4a, 4b and congruent recesses 43c, 43d in the third and fourth processing layers 4c, 4d are generated.
  • the second protection structure 5b being arranged between the second and third processing layers 4b, 4c is configured to block said radiation R, the radiation R propagating along the first direction d1 is prevented from impinging on the third processing layer 4c and the radiation R propagating along the second direction d2 is prevented from impinging on the second processing layer 4b, respectively.
  • the data carrier 1 depicted in figure 7 differs from the data carrier according 1 to figures 6a to 6c in that it comprises two opaque areas, wherein a first opaque area 6 extends at least partially between the second processing layer 4b and the third processing layer 4c along the extension direction E and a second opaque area extends at least partially between the third processing layer 4c and the fourth processing layer 4d.
  • a congruent ablation of the second and the third processing layers 4b, 4c unravels the first opaque area 6
  • a congruent ablation of the first, second and third processing layers 4a, 4b, 4c unravels the second opaque area 6.
  • higher complexity or diversity can be added to the data carrier 1.
  • FIGS 8 and 9 two different embodiments of a data carrier 1 are depicted, which in each case comprise spacing layers 9a-9d.
  • these data carriers 1 comprise in each case a cover layer 2, a base layer 3, two processing layers 4a, 4b and a protection structure 5a as described previously.
  • a transparent spacing layer 9a-9d is arranged on both sides of the processing layers 4a, 4b (figure 8) or on both sides of the protection structure 5a (figure 9).
  • the spacing layers 9a-9d serve the purpose of increasing the distance between the processing layers to improve or even enable an optical effect e.g. while tilting the document.
  • a second reason can be from a production point of view. It can be the case that the processing layer will be provided on a spacing layer and not separately.

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Abstract

La présente invention concerne un support de données (1) qui comprend dans cette séquence le long d'une première direction (d1) une couche de couverture (2), au moins une première couche de traitement (4a) et une seconde couche de traitement (4b), et une couche de base (3). Le support de données (1) comprend en outre au moins une structure de protection (5a) qui est disposée entre les première et seconde couches de traitement (4a, 4b). La structure de protection (5a) est conçue de telle sorte que, lors de l'irradiation d'un rayonnement électromagnétique (R) constituant un premier spectre le long de la première direction (d1), la structure de protection (5a) empêche sensiblement entièrement ledit rayonnement électromagnétique (R) de heurter la seconde couche de traitement (4b). Un procédé de production d'un support de données (1) comprend les étapes consistant à fournir une couche de couverture (2), au moins une première couche de traitement (4a) et une seconde couche de traitement (4b), une couche de base (3) et au moins une structure de protection (5a). La structure de protection (5a) est conçue de telle sorte que, lors de l'irradiation d'un rayonnement électromagnétique (R) constituant un premier spectre le long de la première direction (d1), la structure de protection (5a) empêche sensiblement entièrement ledit rayonnement électromagnétique (R) de heurter la seconde couche de traitement (4b).
EP20716531.7A 2019-04-19 2020-04-10 Bloqueurs d'ablation Pending EP3956148A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19170398 2019-04-19
PCT/EP2020/060343 WO2020212289A1 (fr) 2019-04-19 2020-04-10 Bloqueurs d'ablation

Publications (1)

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EP3956148A1 true EP3956148A1 (fr) 2022-02-23

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EP20716531.7A Pending EP3956148A1 (fr) 2019-04-19 2020-04-10 Bloqueurs d'ablation

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EP (1) EP3956148A1 (fr)

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