EP2644406A2 - Method for producing a data carrier and data carrier obtainable therefrom - Google Patents

Abstract

The method comprises providing a data carrier comprising a substrate disposed on a front side and a strip-shaped security element or a laser-sensitive marking (3) arranged on a rear side of the carrier, and subjecting the laser-sensitive marking to laser radiation to produce a mark that is applied on the front side of the carrier. The data carrier comprises an image obtained on the front side by laser radiation. The strip-shaped security element or laser-sensitive marking has a laser-sensitive marking area that is disposed opposite to the substrate on the front side of the carrier. The method comprises providing a data carrier comprising a substrate disposed on a front side and a strip-shaped security element or a laser-sensitive marking (3) arranged on a rear side of the carrier, and subjecting the laser-sensitive marking to laser radiation to produce a mark that is applied on the front side of the carrier. The data carrier comprises an image obtained on the front side by laser radiation. The strip-shaped security element or laser-sensitive marking has a laser-sensitive marking area that is disposed opposite to the substrate on the front side of the carrier. The mark comprises is formed on the front side of the data carrier when the mark has visually discernible differences in brightness of transmitted light, and has a higher brightness. A laser-sensitive recording layer (2) is formed on the laser-sensitive marking area so that a visually detectable marker generated on the rear side of the substrate through which the laser radiation penetrates has difference in line width and/or intensity of the color or contrast.

Description

The invention relates to a data carrier, in particular a value document, such as a banknote, with a possibly individualizing identifier obtained on the front by the action of laser radiation. The invention further relates to a method for producing the data carrier.

Identity cards, such as credit cards or identity cards, have long been personalized by laser engraving. In personalization by laser engraving, the optical properties of the card material in the form of a desired marking are irreversibly changed by suitable guidance of a laser beam. For example, in the document DE 30 48 733 A1 an identity card with applied information is described, which has on a surface of different colored and stacked layer areas, which are at least partially interrupted by visually recognizable personalization data.

In addition to identity cards, other security documents worthy of forgery, such as banknotes, shares, bonds, certificates, vouchers, checks, admission tickets and the like, are increasingly provided with a laser-generated, optionally individualizing identifier, such as a serial number.

Proceeding from this, the object of the invention is to provide a data carrier of the type mentioned above, which has a laser-generated individual identification of high counterfeit security. In particular, the marking should be easy to integrate into existing designs or print images.

This object is achieved by the data carrier and the method for producing the same according to the independent claims. Further developments of the invention are the subject of the dependent claims.

Summary of the invention

1. a) Bereitstellen eines Datenträgers, umfassend ein Datenträgersubstrat mit einem auf der Vorderseite angeordneten lasersensitiven Kennzeichnungsbereich und einem auf der Rückseite angeordneten, in einem streifenförmigen oder Patch-förmigen Sicherheitselement gebildeten lasersensitiven Kennzeichnungsbereich, wobei der lasersensitive Kennzeichnungsbereich des Sicherheitselements mindestens zum Teil dem auf der Vorderseite des Substrats angeordneten lasersensitiven Kennzeichnungsbereich gegenüberliegt,
2. b) Beaufschlagen des auf der Vorderseite angeordneten lasersensitiven Kennzeichnungsbereichs von der Vorderseite her mit Laserstrahlung, um den auf der Vorderseite angeordneten lasersensitiven Kennzeichnungsbereich mit einem gegebenenfalls invidualisierenden Kennzeichen zu versehen und in dem auf der Rückseite angeordneten, im Sicherheitselement gebildeten lasersensitiven Kennzeichnungsbereich durch die das Substrat durchdringende Laserstrahlung eine Markierung zu erzeugen, die einen deckungsgleichen Ausschnitt des auf der Vorderseite aufgebrachten Kennzeichens bildet.

A first aspect of the invention relates to a method for producing a data carrier, comprising a on the front by the action of laser radiation obtained, optionally individualizing indicator and introduced on the back in a strip-shaped or patch-shaped security element marker, the congruent section of the on Formed front plate, the method comprising the following steps:

1. a) providing a data carrier comprising a data carrier substrate having a laser-sensitive identification area arranged on the front side and a laser-sensitive identification area arranged on the rear side in a strip-shaped or patch-shaped security element, wherein the laser-sensitive identification area of the security element at least partially lies on the front side of the security element Substrate arranged opposite laser-sensitive marking area,
2. b) applying laser radiation to the laser-sensitive identification area arranged on the front side to provide the laser-sensitive identification area arranged on the front side with an optionally invidual mark and in the laser-sensitive identification area arranged on the back side through the substrate penetrating the laser sensitive identification area Laser radiation to produce a mark that is a congruent Section of the applied on the front plate marks.

The security element can also be in printed form.

It is preferred that in the case of the data carrier obtained in step b), the possibly individualizing markings produced on the front have visually discernible differences in brightness when viewed from the front in transmitted light, in particular in the overlapping area of the individualizing mark and generated on the front side the mark produced on the back has a higher brightness.

It is preferred that in the data carrier provided in step a), the laser-sensitive identification area arranged on the front side and the laser-sensitive identification area arranged in the security element are each formed by a laser-sensitive recording layer. The laser-sensitive recording layer on the front side can also be formed by the substrate itself.

According to a first preferred embodiment, the laser parameters are changed during the application in step b), so that both the laser-sensitive recording layer of the laser-sensitive identification area arranged on the front side and the laser-sensitive recording layer of the laser-sensitive identification area arranged in the security element are differently influenced in each case will be maintained, in part in part, and partially removed.

According to a second preferred embodiment, which can be combined with the first preferred embodiment, in the data carrier provided in step a), the laser-sensitive recording layer of the laser-sensitive identification area arranged on the front side is provided in partial areas with different laser absorption, so that in step b) the marking produced by the substrate laser radiation penetrating the rear side of the data carrier has visually recognizable differences in the line width and / or the color or contrast intensity.

According to a third preferred embodiment, which can be combined with the first and / or the second preferred embodiment, the strip-shaped or patch-shaped security element of the data carrier provided in step a), in particular the laser-sensitive recording layer of the security element, is provided in partial areas with different laser absorption such that the marking produced in step b) on the rear side of the data carrier by the laser radiation penetrating the substrate has visually recognizable differences in the line width and / or the color or contrast intensity.

The data carrier is preferably a value document or a security paper.

A second aspect of the invention relates to a data carrier obtainable by the method according to the first aspect of the invention.

Detailed description of the invention

According to the invention, the laser marking introduced in a security element on the rear side of a data carrier leads in the course of laser application the front of the disk is created, a see-through effect that helps to secure the disk against tampering. The see-through effect is visible to the viewer without aids, such as a magnifying glass or the like, visually recognizable and beyond machine.

According to the invention, the individualizing mark is e.g. a serial number. The serial number may be in the form of letters and / or numbers, and optionally with extensions such as e.g. an additional check digit or a symbol. However, graphic codes, such as barcodes or matrix codes, or identifiers in the form of images are also suitable as individualizing characteristics.

The data carrier substrate may in particular be formed from paper, a film, a plastic body such as polycarbonate or PVC, or from a paper-foil laminate. As paper-film laminates come eg plastic / paper / plastic composites (see, eg WO 2004/028825 A2 ) or paper / plastic / paper composites in question.

Suitable laser sources are CO ₂ lasers, Nd: YAG lasers, Nd: YVO ₄ lasers or other types of lasers in the wavelength range from UV to far-infrared, where the lasers often also advantageously work with frequency doubling or tripling. Laser sources in the near infrared are used with particular advantage, since this wavelength range fits well with the absorption properties of the substrates and printing inks used for value documents. For example, it is easy to specify for this range printing inks which are transparent to the laser radiation but opaque and colored in the visible spectral range for the human observer. With particular advantage, infrared lasers in the wavelength range of 0.8 μm to 3 μm, in particular Nd: YAG laser or Nd: YVO ₄ laser, and more particularly a Nd: YVO ₄ labeling laser (λ = 1064 nm). A Nd: YVO ₄ laser can expediently be used with a pulse frequency between 50 kHz and continuous wave, a power between 10 and 100 W, for example 50 W, and a marking speed between 1 and 30 m / s, preferably between 3 and 15 m / s, operate. Optionally, the working distance between the lens and the substrate may be slightly less than that required for optimum focusing to achieve easy defocusing of the laser spot. For fast captions, a vector marking mode is suitably used. Furthermore, for introducing the markings, in particular a Nd: YVO ₄ marking laser (λ = 1064 nm) can be operated in raster mode, which is advantageous, in particular, for the labeling of cards or data pages of passports. For this purpose, the Nd: YVO ₄ laser can be operated, for example, with a pulse frequency between 20 kHz and 80 kHz, a power between 0.5 and 4 W and for a dot resolution of the grid between 250 and 4800 dpi. Again, the laser spot can be easily defocused.

Especially in the case of the first preferred embodiment mentioned in the summary, the laser parameters are changed during the laser application. For example, the front side of the data carrier can be provided with a single laser-sensitive recording layer having a first and a second marking area, wherein in the first labeling area with comparatively high laser energy an individualizing mark is introduced and in the second marking area with comparatively low laser energy a background is generated. On the rear side of the data carrier, the laser radiation penetrating the data carrier substrate leads in the area of the security element to a removal of the laser-sensitive elements formed in the security element Recording layer (eg a metallization). Depending on the variation of the laser parameters and the design of the layer thickness of the laser-sensitive recording layers (on the front and / or back of the data carrier), numerous design possibilities result. For example, the laser-sensitive recording layer formed in the security element can be removed, in particular demetallized, by the variation of the laser parameters to varying degrees. The marking produced in this way in the security element has, for example, a high line width in a first marking area and a small line width in a second marking area. Alternatively, the laser parameters may be varied so that the laser-sensitive recording layer formed in the security element is (partially) removed in a first identification area and remains (completely) in a second identification area.

In general, the materials to be provided with a marking according to the invention, ie substrates, printing inks or applied layers, must contain substances which are laser-markable. In the case of an IR laser in the wavelength range of 0.8 microns to 3 microns, especially 1064 nm, the substances contained (ie pigments, dyes and the like) at this wavelength must have sufficient absorption. Layers applied to the data carrier should be in the form of a metallization or in the form of an absorbing printing layer. Laser-markable paper should contain sufficient absorber, eg TiO ₂ , soot or interference pigments.

The laser-sensitive identification area arranged on the front side of the data carrier substrate is advantageously formed by a laser-sensitive recording layer applied to the data carrier. This recording layer may, for example, a printing layer, in particular a

Intaglio, a screen printing layer, an effect color layer, an absorbent color layer, or a print layer of a mixture of a nonabsorbent ink with an absorbent ink or other absorbent material. In other embodiments, the laser-sensitive recording layer comprises a metal layer or a printing ink which contains laser radiation-absorbing additives, such as graphite or carbon black.

The laser-sensitive recording layer may, in particular, be an optically variable layer which has optically variable pigments, interference-layer pigments or pigments prepared on the basis of liquid-crystalline polymers (see, for example, US Pat WO 97/19818 A1 ).

In the case where the recording layer is based on a mixture of a nonabsorbent ink and an absorbing ink, the color mixture preferably contains optically variable color pigments, wherein as the mixture component transparent to the laser radiation, in particular optically variable liquid crystal pigments or a transparent or translucent intaglio and for the absorbent mixture component For example, optically variable interference layer pigments come into question. Other color components which can be irreversibly changed in their optical properties, such as an intaglio printing ink, a metallic effect ink or metallic pigments, a luminescent color or luminescent pigments, luster pigments or a thermochromic color, are also suitable for the absorbing mixture component.

It is furthermore preferred to provide the recording layer arranged on the front side of the data carrier in the form of a color layer with magnetic pigments which are optionally magnetically aligned (see eg the WO 2011/107271 A1 ). The magnetic pigments may be, for example, non-spherical, in particular platelet-shaped, formed (see, for example, the EP 1 251152 B1 ). In addition, the magnetic pigments may be colored and / or optically variable, in particular as color-shifting thin-film elements having an interference layer structure (see, for example, US Pat EP 1 366 380 A2 ).

In addition to the aforementioned possibility of producing the laser-sensitive identification regions arranged on the front side of the data carrier by applied layers, alternatively or additionally an identification region in the form of a laser-sensitive recording region may be formed in the substrate itself. Such a laser-sensitive recording area can be formed by introducing absorbing substances into the substrate. Examples of suitable absorbing substances are TiO ₂ , soot particles, interference pigments or infrared absorbers.

Specifically, in the case of the second preferred embodiment mentioned in the Summary, the laser-sensitive recording layer of the laser-sensitive identification region disposed on the front side is provided in partial regions having different laser absorption. Depending on the variation of the layer thickness and / or the material nature of the laser-sensitive recording layer on the front side of the data carrier, the intensity of the laser radiation penetrating the substrate can be set differently. With regard to the marking produced in the back of the data carrier, numerous design options result in this way. For example, the front side of the data carrier can be provided with two different, adjacent laser-sensitive recording layers, which have a different laser absorption and each form a first and a second identification area. Both marking areas are exposed to laser radiation in order to introduce the individualizing characteristic in both areas. On the rear side of the data carrier, the laser radiation penetrating the data carrier substrate in the region of the security element leads to a removal of the laser-sensitive recording layer formed in the security element (eg a metallization). Due to the different laser absorption of the recording layers applied on the front side of the data carrier, the laser-sensitive recording layer formed in the security element is removed to a varying extent, in particular demetallised. The marking produced in this way in the security element has, for example, a high line width in a first marking area and a small line width in a second marking area. Alternatively, the recording layers on the front side of the data carrier can be varied such that the laser-sensitive recording layer formed in the security element is (partially) removed in a first identification area and remains (completely) in a second identification area.

According to a variant of the second preferred embodiment described above, the recording layers provided on the front side of the data carrier with different laser absorption are not two different recording layers but a recording layer which has a different layer thickness in different areas.

The strip-shaped or patch-shaped security element which can be used according to the invention can be, for example, a security thread. When viewing the data carrier, the security element can be visually completely or only partially visible from the rear side. An example of an only regionally Visually identifiable security element is a window security thread, which emerges in window areas on the surface of a banknote, while it is embedded in the intervening web areas inside the banknote (see, for example, US Pat Fig. 1 of the WO 2004/097112 A1 ).

The security element expediently has a (film) substrate and a laser-sensitive recording layer, in particular a metallization such as silver. In addition, the laser-sensitive recording layer of the security element may be multi-layered and may include, for example, a metallization (such as silver) and a magnetic layer (particularly comprising iron oxide). It is preferred that the magnetic layer is formed above the metallization, the term "above" being understood to mean that the magnetic layer faces the viewer of the data carrier from the rear side. It is particularly preferred for the laser-sensitive recording layer of the security element to be based on a layer structure comprising the following three layers: metallic layer-magnetic layer-metallic layer (in particular on the side which is visible to the viewer, this layer may in particular be colored). In principle, the magnetic layer does not necessarily have to be present over the entire surface, but instead can be provided with recesses. This procedure is useful to affect the laser energy absorption capacity (see the third preferred embodiment mentioned in the summary). At the points of the security element where both a metallic layer and a magnetic layer are present, the laser energy is completely absorbed, a demetallization does not take place. At the points of the security element where the magnetic layer is missing and only the metallic layer is present, the laser absorption leads to demetalization.

The security element may in particular comprise a holographic device. In addition, security elements come into question which contain a microoptical representation arrangement with microstructures and microimage elements for enlarged imaging of the microstructures, for example microlens or hollow microarray arrays. Furthermore, security elements with reflective sawtooth gratings, such as those made of, for example, are suitable WO 2011/066991 A2 . WO 2011/066990 A2 and WO 2012/000669 A1 are known.

• (a) Folie; (b) Metallisierung; (c) magnetische Schicht; (d) metallisierter Prägelack; (e) Folie.

A security thread may, for example, be based on the following layer structure (the thread is embedded in the data carrier such that the film (e) faces the observer and the film (a) faces the data carrier, in the method according to the invention the laser radiation penetrates the security thread from the film (a) her):

• (a) film; (b) metallization; (c) magnetic layer; (d) metallized embossing lacquer; (e) foil.

Furthermore, security elements, in particular security threads, with a so-called "Colorshift / Colorfix" structure are suitable. Such security elements are from the WO 2006/040069 A1 The disclosure of which is incorporated herein by reference. The security element in this case has an optically variable layer which imparts different color impressions at different viewing angles, wherein a semitransparent color layer is arranged in a covering area over the optically variable layer, and the color impression of the optically variable layer when viewed under predetermined viewing conditions to the color impression of semitransparent Color layer is adjusted in the coverage area. The semitransparent ink layer can in particular in the form of characters, patterns or codes. Furthermore, the semitransparent color layer may have recesses in the form of characters, patterns or codes. It is preferred that, when the security element is viewed vertically, the color impression of the optically variable layer outside the coverage area essentially corresponds to the color impression of the semitransparent ink layer in the coverage area. The optically variable layer may, in particular, be formed from a plurality of partial layers, for example a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer. The dielectric spacer layer may, for example, be partially absorbent. The reflection layer may be formed by an opaque or a semi-transparent metal layer. In addition, the reflection layer can be present at least in regions as a magnetic layer. In particular, recesses can be produced by the method according to the invention in the reflection layer, which form transparent or semitransparent regions in the security element. The optically variable layer may preferably contain one or more layers of liquid-crystalline material, in particular of cholesteric liquid-crystalline material. The liquid-crystalline material may in particular be in the form of a liquid-crystalline polymer material or in the form of pigments embedded in a binder matrix. Alternatively, the optically variable layer may be formed by a diffractive diffraction structure.

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.

Fig. 1a

eine schematische Draufsicht auf die Vorderseite einer Banknote gemäß einem ersten Ausführungsbeispiel;

Fig. 1b

eine schematische Draufsicht auf die Rückseite der Banknote von Fig. 1a;

Fig. 2

eine schematische Draufsicht auf die Vorderseite einer Banknote gemäß einem zweiten Ausführungsbeispiel;

Fig. 3a

eine schematische Draufsicht auf die Vorderseite einer Banknote gemäß einem dritten Ausführungsbeispiel; und

Fig. 3b

eine schematische Draufsicht auf die Rückseite der Banknote von Fig. 3a.

Show it:

Fig. 1a

a schematic plan view of the front of a banknote according to a first embodiment;

Fig. 1b

a schematic plan view of the back of the bill of Fig. 1a ;

Fig. 2

a schematic plan view of the front of a bill according to a second embodiment;

Fig. 3a

a schematic plan view of the front of a banknote according to a third embodiment; and

Fig. 3b

a schematic plan view of the back of the bill of Fig. 3a ,

This in Fig. 1a and Fig. 1b shown first embodiment and the in Fig. 2 shown second embodiment belongs to the above-mentioned first preferred embodiment of the invention. In this case, the laser is applied to the front of the data carrier with different laser parameters.

Fig. 1a 1 shows the front side of a banknote 1 with a laser-sensitive recording layer 2 arranged on the front side. In the banknote 1, a security thread 5 (shown dotted in the figure) is embedded on one side, ie the thread 5 is in viewing of the front side of the banknote 1 not visible. The banknote substrate is made of paper. The laser-sensitive recording layer 2 (shown in the figure in the form of hatching) is based on a magnetic, thin layer which has magnetic pigments and gives the viewer the impression of a colored color (such layers are known, for example, from US Pat WO 02/073250 A2 and the WO 2011/107271 A1 known). In the recording layer 2, an individualizing marking 3, namely the serial number "123456", was generated by applying laser radiation from the front in a first kerf marking area with the parameter set (b) given below. The label 3 is in the form of removal of the magnetic pigment from the color mixture and was obtained with high laser intensity. In the marking area 4, the recording layer 2 was treated with laser radiation from the front side with the parameter set (a) given below. The lower laser intensity leads to a silver marking in the marking area 4.

At higher marking speed less energy is deposited per distance, resulting in a lower intensity. An Nd-vanadate solid-state laser (laser model: Edgewave, "Innoslab IS8I-E") was used.

• Markiergeschwindigkeit: 11 m/s
• Pulsfrequenz: 48 kHz
• Ladezeit des Laserresonators: 13 µs
• Leistung: 75 W
• Fokussierung auf Linienbreite: 0,8 mm

Parameter set (a):

• Marking speed: 11 m / s
• Pulse frequency: 48 kHz
• Charging time of the laser resonator: 13 μs
• Power: 75W
• Focus on line width: 0.8 mm

• Markiergeschwindigkeit: 3 m/s
• Pulsfrequenz: 48 kHz
• Ladezeit: 17,5 µs
• Leistung: 75 W
• Fokussierung auf Linienbreite: 0,3 mm

Parameter set (b):

• Marking speed: 3 m / s
• Pulse frequency: 48 kHz
• Charging time: 17.5 μs
• Power: 75W
• Focus on line width: 0.3 mm

Fig. 1b shows the back of the banknote 1. The security thread 5 embedded in the paper on one side, in the example a metallized foil strip, is completely recognizable when viewing the back of the banknote 1. In the region 6 of the security thread 5, the metallization of the thread 5 has a matting, which is caused by the laser radiation penetrating the substrate with parameter set (a). The laser radiation leads in the region 6 of the thread 5 to a slight demetallization. In the region 7 of the thread 5, the laser radiation penetrating the substrate with parameter set (b) led to a complete demetallization. The area 7 represents a mark which forms a congruent section of the mark applied on the front side (in the present example, the right half of the figure "5").

This in Fig. 2 shown second embodiment is a variant of the in the Fig. 1a and Fig. 1b described first embodiment. Fig. 2 shows the front of a banknote 8, with the above in connection with the Fig. 1a banknote 1 is identical. As in the first exemplary embodiment, the marking "12345" was generated in the laser-sensitive recording layer 2 with laser radiation with parameter set (b). Unlike in the first embodiment, where the front side of the banknote outside the recording layer 2 has not been exposed to laser, the exposure to laser radiation with parameter set (a) in the present case was carried out in dashed area 9, ie Both the magnetic pigments, laser-sensitive recording layer 2, and the paper substrate was applied in the areas 10 with laser. In areas 10, laser exposure led to blackening of the paper substrate.

As a laser-sensitive recording layer 2 in the Fig. 1a and Fig. 2 In accordance with an alternative embodiment, printed layers with optically variable ink (OVI) can be used. According to a further alternative, the laser-sensitive recording layer 2 may be an optically variable layer which has pigments prepared on the basis of liquid-crystalline polymers (see, for example, US Pat WO 97/19818 A1 ).

This in Fig. 3a and Fig. 3b shown third embodiment belongs to the aforementioned second preferred embodiment of the invention. In this case, the laser is applied to the front of the data carrier without varying the laser parameters. The laser-sensitive recording layer on the front side of the banknote has two different recording layers with different laser absorption, so that the marking is produced in the thread on the back side of the banknote with different stroke width.

Fig. 3a shows the front side of a banknote 11 with a front mounted on the laser-sensitive recording layer 12 (shown hatched in the figure). In the banknote 11, a security thread 13 (shown dotted in the figure) is embedded on one side, ie the thread 13 can not be seen when viewing the front side of the banknote 11. The banknote substrate is made of paper. The laser-sensitive recording layer 12 contains an optically variable layer which has pigments prepared on the basis of liquid-crystalline polymers (see, for example, US Pat WO 97/19818 A1 ). The individualizing mark "123456" generated by the action of laser radiation when applied from the front extends over the area of banknote 11 printed with laser-sensitive recording layer 12 and over the unprinted area of banknote 11. In the unprinted area, the laser radiation produces a blackening in the paper.

Fig. 3b shows the back side of the banknote 11. The security thread 13 embedded in the paper on one side, in the example a metallized film strip, is completely recognizable when viewing the back side of the banknote 11. In the area 14 of the security thread 13, the thread 13 has a weak demetallization, ie a marking in the form of a small line width. In the region 14 of the filament 13, the laser radiation applied to the front surface was largely absorbed by the liquid crystal-based laser-sensitive recording layer 12, so that the metallization of the filament 13 at this point was only partially removed. In the area 15 of the security thread 13, the thread 13 has been demetallized relatively strongly, ie the marking has a high line width. In the region 15 of the filament 13, the laser radiation applied to the front side was absorbed only by the paper substrate to a limited extent, so that the metallization of the filament 13 was almost completely removed at this point.

Further embodiments are based on the embodiments described above. As a security thread while a thread is used, in addition to a metallization in addition to a magnetic coding, ie, a magnetic layer with recesses has. At the locations of the security thread which carry a magnetization, the laser application under certain parameter conditions does not result in a light-detectable marking. When looking at the thread in the Incident light is a slight elevation at these points in the glancing angle, similar to an embossing. The laser energy was completely absorbed by the metallization and the magnetic layer, thus no demetallization of the visible side takes place.

Claims (8)

A method of manufacturing a data carrier comprising a tag obtained by the action of laser radiation on the front side and a tag formed on the back in a stripe-shaped or patch-shaped security member forming a registering section of the tag applied on the front side, the method being as follows Steps contains: a) providing a data carrier comprising a data carrier substrate having a laser-sensitive identification area arranged on the front side and a laser-sensitive identification area arranged on the rear side in a strip-shaped or patch-shaped security element, wherein the laser-sensitive identification area of the security element at least partially lies on the front side of the security element Substrate arranged opposite laser-sensitive marking area, b) applying laser radiation to the laser-sensitive identification area arranged on the front side from the front side to mark the laser-sensitive identification area arranged on the front side and a laser-sensitive identification area formed in the security element by the laser radiation penetrating the substrate To create mark that forms a congruent section of the applied on the front plate. A method according to claim 1, wherein in the data carrier obtained in step b), the individualizing mark produced on the front side visually recognizable in transmitted light when viewed from the front side
Having differences in brightness, in particular in the overlap region of the generated on the front of individualizing mark and the mark generated on the back has a higher brightness. Method according to claim 1 or 2, wherein in the data carrier provided in step a) the laser-sensitive identification area arranged on the front side and the laser-sensitive identification area arranged in the security element on the rear side are each formed by a laser-sensitive recording layer. Method according to one of the preceding claims, wherein the laser parameters are changed during the application in step b), so that both the laser-sensitive recording layer of the front-mounted laser-sensitive identification area, and the laser-sensitive recording layer of the arranged on the back, in the security element formed laser-sensitive identification area each be influenced differently, in particular partially persist and partially removed. Method according to one of the preceding claims, wherein in the provided in step a) the laser-sensitive recording layer of the front-mounted laser-sensitive identification area is provided in partial areas with different laser absorption, so that in step b) on the back of the data carrier through which the substrate penetrating laser radiation produced mark visually recognizable differences in the line width and / or the color or contrast strength. Method according to one of the preceding claims, wherein the strip-shaped or patch-shaped security element of the data carrier provided in step a) is provided in partial regions with different laser absorption, such that the marking generated in step b) on the back side of the data carrier by the laser radiation penetrating the substrate has visually recognizable differences in the line width and / or the color or contrast intensity. Method according to one of the preceding claims, wherein the data carrier is a value document or a security paper. A data carrier obtainable by the method according to one of claims 1 to 7.

Images