DE19949945A1 - Data carriers with authenticity features and manufacturing processes therefor - Google Patents

Abstract

The invention describes a card-shaped data carrier, consisting of laminate layers, in which visually irreversible changes in the interior of the data carrier are brought about by means of a laser beam in such a way that when viewed from different angles different graphical structures become recognizable and can be used to verify the authenticity of the data carrier and manufacturing processes the same.

Description

The invention describes a data carrier consisting of various Laminate layers, in which visually irreversible changes in the interior of the data carrier are effected in such a way that when viewed from different graphical structures can be recognized from different angles and used in this way to verify the authenticity of the data carrier can and manufacturing processes of the same.

The present invention relates to a novel method and a Inexpensive method for laser processing systems for the production of wiggle-like effects on laminates combined with generally transparent or translucent cover foils.

The basic principles are described in EP 0 216 B1 and EP 0 219 012 B1 such methods and procedures described, in the usual Credit card format using a polycarbonate film composite of several thin films intermediate security printing is produced by means of lamination. The Authenticity features are in the card network by means of a laser beam registered. Here, in a melting process in one  Thermal transfer press a top of the card with a so-called lenticular grid Mistake. The upper edge of the lenticular screen is preferably in one plane with the Card body arranged so that a certain protection of the lens surface given is. Due to the lenses of the lenticular grid thus formed, a Laser beam directed at an angle to the surface of the card in the area of each lens and focused on a certain inner plane of the map is directed. In this level, defined darknesses - as Authenticity feature - generated. This way, at least two - of the Direction of the observer - dependent authenticity features on the map be registered.

The usual lens diameters can be very easily due to the existing and technically possible refractive indices thermoplastic Calculate plastics and there are usually lens diameters of around 250 to 400 microns are used in a cylindrical shape side by side are arranged in a grid. Grid distances are used that are slight are below the lens diameter, so that the lenses are in the edge area partially overlap. This results in embossing depths of typically 70 to 100 Micrometer. With a refractive index of about 1.5, the irreversible and visible material changes at a depth of, for example, 200 to 450 Micrometers in the card network and are therefore good against mechanical Damage and counterfeiting protected.

The European patent specification EP 0 219 012 B1 now further states that the change in optical properties is limited to areas (pixels) whose radial expansion is smaller than the diameter of a single lens, and that the information generated using laser beams from at least two different directions in the lenticular area were recorded under read the same directions in limited angular ranges and / or can be measured.

A disadvantage in the production of such lenticular screens is the fact that a relatively deep embossing during the lamination process - cf. EP 0 842 791 A2 - and / or a little more complex in the single card - cf. EP 0 843 281 A2 - zu has taken place, in the single card generally the already finished graphically designed and laminated card a relatively strong distortion or a strong Material flow due to material displacement to form the lenticular grid Consequence.  

In the case of embossing using press plates in a multi-day thermal Transfer press must also be considered that such embossing Press plates are extremely expensive and therefore the whole process becomes very expensive.

The object of the invention is accordingly a simplification of the embossing process any customer-specific lenticular structure when achieving one comparable or improved wobble effect due to laser processing and an additional increase in the complexity of the process and thus increase in Difficulty of counterfeiting such a shaky effect.

This task is accomplished by a method based on the technical teaching of the Claim 1 solved, which mainly has the content that the laser inscription the card in a first process step without the aid of a lens grid takes place and that the lens grid is applied only in a second process step becomes. According to the invention, there is therefore a different order of introduction the authenticity features in the card, because only the authenticity features are registered and only then the lens system is created to be separated by the direction of view To ensure reading.

According to the invention, the lens system for the registration of the Authenticity features used. This gives the advantage that the cards in one relatively simple labeling process with the two (or more than two) different authenticity features are labeled and that only at the final Completion of the card, the lens system is subsequently created.

According to the invention, the necessary information is therefore without Surface relief or without optical lens effect in the card body in such a way introduced that by a subsequent application accordingly coordinated Surface reliefs or optical lens effects the previously introduced Information optically from a viewer and / or measurement technology at least two different directions can be recognized or detected.

According to the subsequently applied surface relief and whose optical lens effect is two complete or several different ones Information that is closely adjacent inside a laminate composite using a laser attached, recognized or read out. To make this Surface reliefs are three fundamentally new methods and procedures described.  

Such a method therefore does not need - as in the documents EP 0 216 947 B1 and EP 0 219 012 B1 - a laser beam from at least two different directions, but it can be the closely adjacent information due to a very small laser beam focusing next to each other in the desired depth or location can be arranged. The applied afterwards Surface relief must therefore be applied precisely, so that the Focal point of the optical lenses is recognition and readout of the means Allows information generated by laser beams. The precise application the lenticular grid is not of critical importance. Because it will Lenticular grid applied only offset to the laser image below, then there is only a change in the reading direction during the reading. One image may then only be able to be viewed from an angle of 40 degrees Card surface can be recognized while the other image is at an angle of 70 Degree is recognized. The quality or the visibility of the reading is checked here not affected.

The advantage is that on a costly, register-accurate generation of Lenticular grid can be dispensed with.

Surface reliefs previously applied would indeed be a laser beam focus automatically and there can be a localized, increased Energy density in the desired depth of a laminate composite can be achieved. In the known method, however, the laminate composite must be tilted and / or the laser beam angle must be changed in each case what is not required according to the invention. In addition, the new method enables a much greater freedom of design regarding the optical Lens parameters and, above all, a cheaper manufacturing process.

An essential feature of the invention is that now first by means of a Laser marking in a laser-compatible structure has certain authenticity features be introduced, these authenticity features generally as elements be designated.

In this case, these elements can be blackened in the region of a laser Foil, a volume element or a multilayer laminate introduced color structures can also be introduced. Such Color structures are created by laser radiation and by a corresponding chemical conversion process generated so that in the  different colored impressions corresponding to the irradiated volume element arise.

The use of fine is very important in this type of laser processing focused Nd-YAG laser light at preferably 1064 nm, ie in the infrared range, so that when using so-called laser-transparent or transparent Foils and also common IR-transparent printing inks, the laser beam without significant thermal stress through such laminate layers goes and only blackening in laminate films and / or printing inks with high IR absorption due to charring or carbonization. The authenticity features can, however, also by means of a photochemical reaction suitably selected laser wavelength (s) and corresponding, suitable Pigments or fillers or printing ink combinations in the form of Color effects can be achieved.

The invention is therefore not only black and white in terms of the introduction Elements limited, but it can also be any colored elements in one Volume element of a data carrier can be introduced.

The desired tipping effect is now achieved in that only after the introduction such elements by means of a laser beam in a volume element of a data carrier the corresponding microstructures with which it is possible to insert the To look at elements differently from two different angles, can be applied later.

It is a significant advance over the state of the Technology, because with the state of the art it was a prerequisite that one with expensive Embossing process first applied the optical microstructure, and through this optical microstructure through the security elements in the volume element of the data carrier. This is now dispensed with in accordance with the invention and instead, the unprepared data carrier (which is the necessary microstructures not yet carries optical distinction) elements introduced, and only then are those used for optical differentiation (manufacture of the tilt image) necessary microstructures are applied to the card.

In the context of the present invention, all optically active microstructures are claimed that can consist of different elements:

• 1. any form of cylindrical or other converging lenses
• 2. in particular also Fresnel lenses
• 3. Microstructures in the form of applied hologram layers must be at least translucent, such applied hologram effective microstructures with both a diffraction effect as well as working with a refractive effect.

Such holograms in particular have such hologram structures preferred where a high first order diffraction efficiency is achieved.

In a further embodiment of the invention it is preferred if this is optical effective lens system consists of Fresnel lenses.

The strong material displacements for the production of State-of-the-art cylindrical lenses by dividing them into steps arranged lenses (Fresnel lenses) avoided and this results in a great freedom of design.

The advantage is that when producing such a Fresnel lens embossing with the Reduction of the embossing depth by a factor of 2 to 10 compared to conventional ones Lens systems require very short cycle times. The Fresnel Lenses can therefore be used on a single card that has already been manufactured without any notable Material displacement and thus applied without optical distortion problems and the card previously labeled with the laser can be used to manufacture the Lens system with the existing, same positioning system to be edited.

There is no need for the high initial costs for a series of stamping press plates and with the new process, even small orders can be cost-effective be produced, since only a single embossing stamp is required, the Lifespan is almost unlimited and only due to mechanical operator errors must be eliminated.

It has proven to be a particularly advantageous enhancement of the visual effect emphasized that a surface embossed with a Fresnel lens structure is additionally provided with a so-called high index coating, that preferably an approximately lambda / 4 effect is achieved.  

This achieves an optimal diffraction efficiency.

When using such Fresnel lenses, it is preferred if the tips of the lenses do not protrude beyond the card surface, otherwise one undesirable material removal of these tips would be the result.

In the second method according to the invention and in the second production variant, so-called 2-channel holograms are used and in particular are used

• a) Sinusoidal grid used as well
• b) toothed grids.

This manufacturing process can also be combined with the embossed ones Lens structures are used. Otherwise, all described here (also the ones to be described later), different optical Readout procedures can be combined with each other, for example by the Embossings diffraction gratings can be overlaid or assigned adjacent.

So there are diffraction effects on the grating structure for reading the underneath information from different perspectives. Here comes it on the wavelength variants of the laser and on the aperture-shaped Intensity distribution of the laser beam, which leads to new effects. As The small thickness in the range from less than 2 to has been particularly advantageous exposed a maximum of 10 micrometers of such holographic elements.

The two-channel holograms mentioned are only one preferred embodiment when it comes to two different ones Introduce microstructures into the surface (hologram layer) of the card.

Of course, the present invention is not limited to this, but it is Multi-channel holograms can also be attached, in which case more than two Microstructures are attached and all the optical elements that are in the volume element of the disk are below, are then more than two viewing angles can also be seen separately.

The term "toothed grid with sawtooth structure" is used in English Understand so-called "Blazed" grids.  

These grids are preferred because they are one compared to sinusoidal grids have higher diffraction efficiency.

In the third method according to the invention and in the third manufacturing variant So-called volume holograms are used, which is typically 10 my thick layers or foils. Here, different effects alone and in Combination take effect. Namely a diffraction without refraction or one Combination of both physical effects, i.e. diffraction and refraction. Usual kinegram or hologram foils (e.g. TKO foil) can maximally Realize 0.5 my steps; with laminating TKO films, however, would very likely be 2 up to 3 my structures possible.

In the fourth method according to the invention and in the fourth manufacturing variant The 3 methods mentioned can now be produced in a combined manner such that First, usual laminate cards with high-gloss surfaces are produced and this preferably in a laser engraving process with the for a wobble The necessary information is provided and the corresponding optical microstructures are applied, optionally as Fresnel lens structure can be embossed and / or as a corresponding additive optical microstructures are imprinted. This should be on a translucent Design of all these optical elements must be respected.

So it is in a disk or generally a security or Value product in the unprepared surface (without any surface Lenticular design) lasered, with an inclination of the laser or Card is no longer required. Therefore, the laser machining process is after Invention faster because the card and / or the laser tilts process prolonging.

Another advantage is that there are no need for precisely focusing lenses the laser beam automatically at a depth of around 100 to 300 micrometers focus to the authenticity elements at all in a defined, constant To be able to write depth. The subsequently applied lens and / or Diffraction system only needs to read out an approximate information different (not necessarily complementarily the same) viewing directions allow. However, it is preferred if the  optical element for a relatively accurate registration, i. H. Positioning of a few 5 micrometers.

However, this is when using the same 3-point registration system in the Laser processing process and when applying the optical element easy to manufacture.

Typical application examples according to the invention are described in more detail in the following points:

• 1. Laser: Typical: Nd: YAG laser with 1,064 nm and a focus of typically 50 micrometers (preferred range between 25 to 300 micrometers).
  • 1. Frequency doubled Nd: YAG Laser SHG. , , Second Harmonic → 25 my focus.
  • 2. Frequency tripled Nd: YAG Laser THG. , , Third Harmonic → 12 my focus. That is, With such new / novel laser systems, laser focus areas in the visible and UV range can be used for extremely small lettering / marking effects and can be realized even more efficiently.
• 2. Color: generation of color effects using a laser, i. a. become photo chemical effects are used, since thermal effects in a thermoplastic Laminate construction are not particularly suitable. The color effect can on the one hand through such new systems based on appropriately chosen layers (Pigments / etc.) Still allow very special shake effects. A color effect can also be obtained holographically.
• 3. Aperture: a new generation of lasers will have apertures and so can very different geometric laser points are generated.
• 4. Laser pulse length: with the novel laser systems can be extremely short Pulses are generated, or can be here with the number of pulses / length Blackening / multiple labeling can be realized.

The advantage of laser processing is that in one operation without using a optical system the tilt or wobble effect are not verified (resolved) can.  

It can not only be cylindrical and / or tilting effects from two sides are generated, but image sequences are possible and they are also isotropic Arrangements can be implemented.

There is also the advantage of a full-surface design of the card, because with the Applying a subsequent (patch) optical element, even larger ones Areas can be used.

The present invention is based on the knowledge that for the implementation not only the well-known lens grid in the form of a cylindrical image arranged lenses allow interesting and difficult to counterfeit effects, but that spherically arranged Fresnel lenses or holographic arranged structures such effects when using special laser optics enable and the type of arrangement of the lenses from a regular to a statistical distribution is possible. It can also be modulated and in particular, frequency-modulated distributions of the lenses can also be selected.

The corresponding embossing stamps or embossing plates or holographic ones Layers have to be on the laminate layer structure and here in particular on the Thicknesses of the individual layers with the corresponding refractive indices or on the refraction and diffraction properties are adjusted or adjusted.

Another embodiment of the invention relates to that one Volume of the multi-layer data carrier through a holographic microstructure can introduce different filing procedures.

In a first filing procedure, a transmission Surface hologram as a film body in the multi-layer card structure laminated and forms a certain volume element of this data carrier.

In another embodiment, a volume hologram can be introduced which is also placed in a film and this in the card network is laminated.

Such volume holograms are typically Photopolymer layers.  

It is important here that first the hologram in a data carrier certain layer or on the surface and only afterwards then the authenticity features are written into the card using a laser.

This lasering of authenticity features takes place exactly according to the state of the art, e.g. B. according to EP 0 216 947 B1 or EP 0 219 012 B1.

An important difference with the present invention, however, is that it is a microstructure integrated in the card structure acts and not optically effective lens system on the surface of the card structure is required.

The subject matter of the present invention results not only from the Subject of the individual claims, but also from the combination of individual claims among themselves.

All information disclosed in the documents, including the summary and features, in particular the spatial depicted in the drawings Education are claimed as essential to the invention, insofar as they are used individually or in Combination are new compared to the prior art.

In the following the invention is based on several ways of execution illustrative drawings explained in more detail. Here go from the drawings and its description further features and advantages of the invention Invention.

Show it:

Fig. 1 is a schematic layer structure of a data carrier in a preferred embodiment,

Fig. 2 is the section schematic through the upper part of the data carrier of Fig. 1 in a first process step,

Fig. 3 section through the disc in a second process step,

Fig. 4 is a comparison with FIG. 3 modified data carrier with additional layers,

Fig. 5, the explanation of the operation of the data carrier,

Fig. 6 is a comparison with FIG. 4 modified embodiment,

Fig. 7 shows a comparison with FIG. 6 modified embodiment,

Fig. 8 top plan view of the disk of FIG. 7 in the direction of the arrow VIII,

Figure 9 shows a comparison with FIG. 8 modified surface structure. Of the data carrier,

Fig. 10 schematically drawn, enlarged sectional view of a lens structure according to the invention,

Fig. 11 is a further magnification of the lens structure of Fig. 10,

Fig. 12 illustrates another embodiment and another manufacturing method in which first in the layer structure of the data carrier a holographic microstructure is introduced,

Fig. 13 shows the exposure of the data carrier of Fig. 12 in section.

Fig. 14, the completed data carrier according to Fig. 13.

In general, the data carrier is provided with the reference symbol 1 , the data carrier being any security element, security document, card or the like. Reference is made to the general description in EP 0 216 947 B1 and EP 0 219 012 B1, the disclosure content of which is used in full for the disclosure of the present invention.

The data carrier 1 preferably consists of a first, non-laserable cover film forming the surface (more generally referred to as layer 2 because this does not necessarily have to form the top layer of the card), which is preferably transparent or translucent or opaque. A transparent, laserable layer 3 is arranged under this non-laserable cover film (layer 2 ).

Of course, the structure of this data carrier in the manner shown is not to be understood as limiting. The non-laserable layer 2 can also be omitted and instead the surface can be formed directly by the transparent laserable layer 3 .

Likewise, it is not shown in the exemplary embodiment that the uppermost layer 2 or 3 can be covered by further protective layers, protective lacquers and the like.

It is also shown in FIG. 1 that an opaque layer 4 made of a carrier material is located below the transparent, laserable layer 3 .

This layer can also have a translucent instead of the opaque property Feature.

This layer can of course also be omitted after it is a pure one Carrier layer acts.

It is only shown by way of example that the data carrier according to FIG. 1 is constructed mirror-symmetrically to its longitudinal center axis, ie the previously described layer structure from layers 2 , 3 , 4 is repeated in the lower part with layers 2 ', 3 ', 4 '. However, this is not a necessary solution. Any other layer structures can be used or the layers 2 ', 3 ', 4 'can also be completely omitted.

In a first method step, the data carrier according to Fig. 2, only the upper half of which is shown, is irradiated by a laser beam 28, 29.

The laser beam 28 , 29 is preferably focused on the layer transition or on the surface of the layer 3 , so that this results in corresponding optically visible elements 8 , 9 which, for. B. can arise from blackening of layer 3 . A color change can of course also be provided in layer 3 or on the surface of layer 4 .

The layer 30 can also be designed as a printing layer, ie it can be provided with a printed image in any way and additionally optically visible elements 8 , 9 (authenticity elements) can then be introduced into these printed elements by means of the laser beams 28 , 29 .

As already stated, the respective laser beam 28 , 29 is focused on the surface of the layer 30 . However, the invention is not restricted to this. The laser beam 28 , 29 can be effective in the entire volume element of the layer 3 , so that the elements 8 , 9 still protrude far into the layer 3 and form corresponding elements there.

It is now important that after the authenticity features have been introduced by means of a laser (laser beams 28 , 29 ), an optically effective layer is only subsequently applied to the card structure. In the exemplary embodiment according to FIG. 3, a microstructure layer 5 is applied which either has holographically active elements, namely microstructures 6 , 7 , or which also consists of corresponding lens structures 14 , as will be explained later with reference to FIGS. 10, 11 or from a combination of both systems 5 , 14 .

It is therefore important that in the process step according to FIG. 2 the laserable elements 8 , 9 are first introduced as authenticity elements and only then is the optical structure (microstructure layer 5 ) applied in order to achieve the desired tilting effect.

In the exemplary embodiment according to FIG. 3, the tilting image effect is achieved in that different microstructures 6 , 7 are applied in the microstructure layer 5 , one element 8 preferably being located centrally below the microstructure layer 6 , while the other element 9 is located centrally below the microstructure 7 .

Here, reference is made to Fig. 5, where it is then explained as seen from different viewing directions, the different elements 8, 9 are visible.

Fig. 4 shows yet in comparison with FIG. 3 that the microstructure layer is introduced 5 as imprinting layer 10 in the uppermost not laserable, layer 2, wherein the embossing layer 10 preferably does not project over the surface of layer 2.

This structure can also be covered by a highly refractive protective layer 13 , whereby the diffraction effect of the underlying, embossed microstructure layer 5 'is further improved.

In FIG. 5, are now further details of the function of the invention in this embodiment according to FIGS. 2 to 4 explained in more detail.

If you now look at the surface of the data carrier from a viewing direction 25 with a viewing beam 20 , then this viewing beam is bent, for example at an angle 22 of 60 ° in the first microstructure 6 , and the element 8 underneath is thus visible in the viewing beam 20 under the viewing direction 25 .

The same applies analogously to the viewing direction 26 and the viewing beam 21 , which falls obliquely on the surface of the data carrier at a complementary angle of 60 degrees and is thereby bent on the microstructure 7 , so that the element 9 lying next to it is thereby visible. Instead of the term "diffraction", the more general term "deflection" will be used in the following, because such microstructure layers have both diffraction and refraction properties.

If you look at element 9 from the direction of view 25 , then element 9 should not be visible.

The route 23 (A ') means that the deflection with respect to the route 23 or 24 should take place in such a way that the neighboring element is not seen as far as possible in the viewing direction. That is, the element 9 should not be visible from the viewing direction 25 .

If one imagines to explain the lines 23 , 24 that the element 9 is a point light source that emits in all directions, then it should be ensured that the beam of the line 23 does not spread while the beam of the line 24 is spreading and is visible. The routes 23 , 24 are complementary to one another.

The beam of the path A 'should therefore not penetrate through the microstructure 6 . The rays a 'and a "are thus complementary to one another.

In FIG. 6 of the previously described embodiment is shown as a modification that the microstructure layer 5 can be also introduced in the region of a highly refractive varnish layer 11, which is covered by a low-index protective layer 12 upward.

FIG. 7 shows the reversal of the exemplary embodiment according to FIG. 6, where it is shown that the microstructure layer 5 is introduced in a low-refractive layer 12 which is covered at the top by a highly refractive protective layer 13 .

Fig. 8 shows an exemplary embodiment the structure of the microstructure layer in plan view where it can be seen that the different microstructures 6, 7, for example, parallel bar-shaped grid form.

In another embodiment according to the invention it is provided that three microstructure elements form the microstructure layer of a data carrier, wherein in addition to the microstructures 6 , 7 there is also another microstructure 27 and the microstructures 6 , 7 , 27 all have different refractive / diffractive properties .

These structures are preferably arranged hexagonally and complement one another mutually so that they extend approximately tiled over the surface.

However, the invention is not limited to this; the microstructures can be in form the surface in any way, e.g. B. punctiform, grid-like, linear, wavy, elliptical and similar structures more form.

In addition to the three microstructures 6 , 7 , 27 described , any other microstructures with other diffractive, refractive effects can also be provided.

This only increases the number of viewing directions from which the underlying elements 8 , 9 become visible in the data carrier.

The exemplary embodiment in FIGS. 10, 11 describes that the microstructure layer 5 is now designed as a lens layer with individual Fresnel lenses arranged next to one another.

As already stated in the general description section, the arrangement has of Fresnel lenses the advantage that with such stepped lenses only a small one Embossing depth is necessary, which is a factor of 2 or 3 below the embossing depth of conventional cylindrical lenses.  

A Fresnel lens is a lens with a large aperture ratio and a collecting lens Effect. The middle part of the Fresnel lens is from a spherical or aspherical thin lens formed. To this central Some ring-shaped zones are attached. The whole arrangement is dimensioned that the centerpiece and the individual zones have the same focus and almost have the same thickness. The belonging to the individual zones Radii of curvature increase with increasing zone height, so that the different centers of curvature are not on the optical axis.

The structure of the Fesnel lenses according to FIGS . 10 and 11 leads to the fact that each Fresnel lens is symmetrical to the central axis 19 . The lens diameter is generally shown at 18 .

It is now important that the embossing depth 17 or structure depth for a lens diameter 18 of, for example, 300 micrometers is only, for example, 17 micrometers. The grid is approximately 270 micrometers, ie the lens structures 14 according to FIG. 10 overlap slightly in each case in the edge region.

The upper edge 15 of the lens structure 14 should, if possible, be below or flush with the surface of the data carrier 1 in order to protect the lens structure 14 from mechanical damage from the top.

The lower layer 16 thus defines the embossing depth or structure depth 17 , down to which the microstructure layer 5 is introduced into the data carrier 1 .

It is now important that the element 8 is visible with the viewing beam 21 only because of the refractive properties of this lens structure 14 , while the element 9 lying next to it is visible with the viewing beam 20 and the viewing direction 25 .

It is again important in this embodiment according to FIGS. 10 to 12 that the lens structure 14 is applied only after the introduction of the authenticity elements 8 , 9 by means of corresponding laser beams 28 , 29 , e.g. B. by embossing.

However, other manufacturing methods for manufacturing the lens structure 14 can be used, such as. B. Surface application of hologram and kinegram films that form such microstructure layers to form the lens structure 14 .

However, the invention is not based on the application of hologram and Limited kinegram slides; any microstructures can be used can be applied subsequently.

in a different form of evasion, for separate protection is claimed and which is independent of that previously described Embodiment, another manufacturing method is claimed.

As shown in FIG. 13 is shown, that are present in a data carrier, in turn, the layers 2, 3, 4, now being introduced in this embodiment, first to the layer 3, the microstructure of layer 5. This microstructure layer 5 is introduced by lamination of this layer in the layer structure. That is, the microstructure layer 5 is introduced as a separate film element between the layers, e.g. B. by lamination.

Such microstructure layers can of course also be introduced into layer 3 in a different way.

After the introduction of the microstructure layer 5 , which forms the microstructures 6 , 7 , the elements 8 , 9 are now introduced by appropriate lasering with the laser beams 28 , 29 , these laser beams 28 , 29 being known per se at an angle to the surface of the data carrier 1 are applied in order to penetrate the microstructures 6 , 7 in a specified manner.

This is a modified method compared to the main method, because according to this variant the microstructure and then the authenticity elements 8 , 9 are introduced first. Protection is also sought for this variant because the penetration of the already existing microstructure for the purpose of writing in the authenticity elements 8 , 9 does not necessarily depend on the focusing ability of this microstructure, as is a requirement in the prior art. If only a diffractive microstructure is used, then it is irrelevant for writing elements 8 , 9 into the volume of the card whether the microstructure already exists or not.

However, the following description applies to both variants, namely to the first variant in which the elements 8 , 9 are written without the microstructure 5 , 6 , 7 , 14 , 27 present and also to the second variant in which the elements are written 8 , 9 happens with existing microstructure 5 , 6 , 7 , 14 , 27 .

Depending on the angle of the laser beam 28 , 29 , either the element 8 or the element 9 is accordingly burned into the laserable layer 3 and applied.

Here again applies that instead of the burn-in, a corresponding one Color change can be made in this layer.

It is important in this exemplary embodiment that the authenticity elements are introduced through the microstructure layer integrated in the card structure by means of laser beam 28 , 29 , but that any optically effective lens systems can be dispensed with because the microstructure layer 5 is present in the card structure itself.

Fig. 14 shows the finished disk where it can be seen that the microstructures 6, 7 overlap each other and overlap to provide the angle-specific introduction of the laser beams 28, 29 corresponding to the production elements 8, to bring. 9

An advantage of the invention is that a superimposed registration of the microstructure film 5 and the underlying elements 8 , 9 in the layer 3 is not absolutely necessary.

If there is a Passer offset, then it can at most happen that one element 8 is visible, for example, from a viewing angle of 20 °, while the other element 9 is only visible from a viewing angle of 60 °.

However, the register offset does not play an important role in the recognizability of the different elements 8 , 9 .

Drawing legend

1

Disk

2nd

Layer (non-laserf.)

3rd

Layer (transp. Laserf.)

4th

Layer (opaque)

5

Microstructure layer

5

'

6

Microstructure

1

7

Microstructure

2nd

8th

element

1

9

element

2nd

10th

Embossing story

11

Lacquer layer (high refractive index)

12th

Protective layer (low refractive lacquer)

13

Protective layer (high refraction)

14

Lens structure

15

Top edge

16

layer

17th

Structure depth

18th

Lens diameter

19th

Center axis

20th

View bundle

21

View bundle

22

angle

23

Route a '

24th

Route a "

25th

Line of sight

26

Line of sight

27

Microstructure

28

laser beam

29

laser beam

30th

layer

Claims (22)

1. A method for producing a data carrier with at least one transparent cover film ( 2 ) and a card body ( 3 , 4 ) underneath, in which authenticity elements ( 8 , 9 ) pass through the cover film ( 2 ) using a laser beam ( 28 , 29 ). be written into the card body, which have different information content from different angles on the data carrier (flip or wobble image), characterized in that in a first process step the authenticity elements ( 8 , 9 ) are first inserted into the card body ( 3 , 4 ) through the cover film ( 2 ) are written through and that in a second process step the microstructure ( 5 , 6 , 7 , 14 , 27 ) necessary for reading from different viewing directions is attached to or in the cover film ( 2 ). 2. The method according to claim 1, characterized in that the on or in the cover film ( 2 ) attached microstructure ( 5 , 6 , 7 , 14 , 27 ) on the surface additionally by at least one further layer ( 11 , 12 , 13 ) is covered. 3. The method according to claim 1 or 2, characterized in that the elements ( 8 , 9 ) are introduced by blackening in the region of a laserable layer ( 3 ), a volume element or a multilayer laminate. 4. The method according to one or more of claims 1 to 3, characterized in that the elements ( 8 , 9 ) are generated in the form of color structures by laser radiation and / or by a corresponding chemical conversion process. 5. The method according to one or more of claims 1 to 4, characterized in that an Nd-YAG laser is used with a wavelength of 1064 nm, which generates a localized carbonization (carbonization) in the laserable layer ( 3 ). 6. The method according to one or more of claims 1 to 5, characterized in that the authenticity features (elements 8 , 9 ) by a photochemical reaction in the layer ( 3 ) with a suitably selected laser wavelength and corresponding, suitable pigments or fillers or Ink combinations in the form of color effects are generated. 7. The method according to one or more of claims 1 to 6, characterized in that the optically active microstructure is produced by embossing the cover film ( 2 ). 8. The method according to claim 7, characterized in that a Fresnel lens arrangement ( 14 ) is produced by embossing. 9. The method according to claim 7 or 8, characterized in that the embossing with a single stamp. 10. The method according to one or more of claims 7 to 9, characterized in that the Fresnel lens structure ( 14 ) is covered with a highly refractive coating upwards in order to achieve an enhancement of the visual effect by a lambda / 4 effect. 11. The method according to one or more of claims 1 to 10, characterized in that a sinusoidal grating which diffracts the optical rays is used as the microstructure ( 5 ). 12. The method according to one or more of claims 1 to 10, characterized in that a toothed grating which diffracts the optical rays is used as the microstructure ( 5 ). 13. The method according to one or more of claims 1 to 12, characterized characterized in that a two- or multi-channel Hologram layer is used. 14. The method according to one or more of claims 1-14, characterized characterized in that a volume hologram is used as the microstructure layer becomes. 15. Card-shaped data carrier with authenticity elements ( 8 , 9 ) in the interior, consisting of at least one cover film ( 2 ) and an optical readout system arranged on the top, through which the authenticity elements ( 8 , 9 ) arranged in the interior are viewed from at least two different viewing directions can be read out with different information content, characterized in that the optical readout system consists of a lens structure ( 14 ) made of Fresnel lenses. 16. Data carrier according to claim 15, that the lens structure ( 14 ) of the Fresnel lenses is embossed (embossing layer 10 ). 17. A data carrier according to claim 16 that the embossing layer ( 10 ) is covered by an optically high-index protective layer ( 13 ). 18. Data carrier according to one or more of claims 15 to 17, characterized in that the microstructure layer ( 5 ) is introduced in the region of a highly refractive lacquer layer ( 11 ) and is covered at the top by a low-refractive protective layer ( 12 ). 19. A data carrier according to one or more of claims 15 to 17, characterized in that the microstructure layer ( 5 ) is introduced in the region of a low-refractive lacquer layer ( 12 ) and is covered at the top by a highly refractive protective layer ( 11 ). 20. Card-shaped data carrier with authenticity elements ( 8 , 9 ) in the interior, consisting of at least one cover film ( 2 ) and an optical readout system arranged on the top, through which the authenticity elements ( 8 , 9 ) arranged in the interior from at least two different viewing directions can be read out with different information content, characterized in that the optical readout system consists of a microstructure ( 6 , 7 ) with holographically active elements. 21. Data carrier according to one or more of claims 15 to 20, characterized in that the microstructure consists of a combination of embossed lens structures ( 14 ) and one or more diffractive and / or refractive microstructures. 22. Data carrier according to one of claims 20 or 21, characterized in that the microstructures 6 , 7 , 27 have a regular structure and are preferably arranged bar-shaped or tiled (hexagonal) side by side on the data carrier above the elements ( 8 , 9 ).