DE102015226602A1 - Method for producing a security document and security document - Google Patents

Abstract

The invention relates to a method for producing a security document (1), comprising the following steps: providing substrate layers (2, 3, 4, 5), wherein at least one of the substrate layers (3) is made of polycarbonate, providing a laminating sheet (8.1, 8.2 ) with embossing punch (9), wherein the embossing punch (9) has a relief-like microstructure (10), laminating the substrate layers (2, 3, 4, 5), wherein the lamination sheet (8.1) with the die (10) on an outer upper side (12) the at least one substrate layer (3) made of polycarbonate is arranged such that during lamination the relief-like microstructure (10) of the stamping die (9) transmits to the substrate layer (3) made of polycarbonate and formed by lamination a document body (11) is provided, and wherein the embossing punch (9) is provided such that the embossed relief-like microstructure (14) at least in a region as diffraction itter (36) is designed to produce a diffraction effect (16, 30). Furthermore, the invention relates to an associated security document (1).

Description

The invention relates to a method for producing a security document. Furthermore, the invention relates to a security document produced by means of the method.

From the prior art it is known to provide optical security features over an embossment in a plastic layer. For this purpose, for example lamination sheets are provided with corresponding stamping dies, so that the security feature is embossed during the lamination step in the plastic layer. An alternative is the introduction into a separate plastic film over an embossing and a subsequent application to the security document.

Furthermore, different security elements are known from the prior art, which have microstructures. These microstructures themselves or in combination with other components of the security element represent a security feature.

From the DE 10 2012 211 077 A1 a security element is known, comprising a device body with a transparent plastic layer, on whose one layer surface microstructures are formed, wherein in the same layer surface additionally diffractive surface structures are formed. Further, a manufacturing method, a lamination sheet and a verification method will be described.

In principle, there is a need to always provide improved security features and security elements whose replication and / or falsification, duplication or the like is difficult and still allow the simplest possible verification of the presence and / or integrity of the security features or information stored therein.

It is therefore an object of the invention to provide a method for producing an improved security document and an improved security document, wherein the method for producing an improved security document results in the security document being harder to fake or imitate than security documents produced by known methods ,

The technical problem is solved by a method with the features of claim 1 and a security document with the features of claim 17. Advantageous embodiments of the invention will become apparent from the dependent claims.

As a security feature to be referred to below a feature that is not or only with very great technical effort to fake or imitate. In particular, the microstructures described below represent such a security feature.

In the text which follows, surface structures having feature sizes in the range from nanometers to a few micrometers, in particular in the range from 200 nm to 6 μm, are referred to as relief-like microstructuring.

In the following, such structures are referred to as diffraction gratings whose characteristic distances and lengths are in the range of the order of magnitude of the wavelength of light which is diffracted by the respective diffraction structure. Typical structure sizes are therefore in the range of a few 100 nm to about 1.5 μm, depending on the wavelength of the light from the UV, the visible, and the infrared light spectrum. A diffraction grating does not necessarily have to consist of a regular array of microstructures.

Transparent is a material in which a propagation of light according to the laws of geometric optics is possible.

Translucent is a material in which light propagation is possible, but due to scattering or other effects does not follow the laws of geometric optics.

In particular, there is provided a method of producing a security document, comprising the steps of: providing substrate layers, wherein at least one of the substrate layers is polycarbonate, providing an embossing lamination stamp, the embossing die having a relief-like microstructure, laminating the substrate layers; Lamination sheet with the die on an outer upper side of the at least one substrate layer of polycarbonate is arranged such that transmits during lamination, the relief-like microstructuring of the die on the substrate layer of polycarbonate and lamination by a document body is formed, and wherein the die is provided in such a way the embossed relief-like microstructure is formed, at least in one region, as a diffraction grating for producing a diffraction effect.

Furthermore, a security document is provided, comprising a document body with an upper side and a lower side opposite the upper side, wherein the document body has at least one material layer of polycarbonate Furthermore, the security document comprises at least one security feature, wherein the at least one security feature is formed by an embossed relief-like microstructure in the at least one material layer of polycarbonate, and wherein the embossed relief-like microstructure is formed at least in one area as a diffraction grating for causing a diffraction effect.

The core idea of the invention is to emboss a microstructuring during lamination directly into a layer of polycarbonate and thereby to create a security feature that is difficult to counterfeit or imitate. For this purpose, a corresponding stamp is provided with a microstructuring on a lamination sheet. During lamination, the microstructure then transfers to a surface of the polycarbonate layer. The advantage is that no additional plastic layer has to be applied or applied in or on the security document, since the surface of the polycarbonate layer is directly processed. Removal, replacement or modification of the microstructure would result in damage or destruction of the security document. Also, a delamination of the microstructuring of the layer can not occur. Counterfeiting is thus made almost impossible. Overall, thus the security against counterfeiting is increased by the method described and the security document described.

A microstructuring-induced diffraction effect becomes more certain the sharper the diffraction patterns or reflections produced by the microstructuring. In addition to a lateral microstructure of the relief-like microstructuring, a vertical microstructure of the relief-like microstructuring is decisive in particular.

Therefore, in one embodiment it is provided that the relief-like microstructure embossed during lamination also has vertically formed microstructures with different structure depths in addition to laterally formed microstructures. If the diffraction effects on the microstructuring are approximated by the Bragg equation, the vertical microstructure corresponds to the presence of additional network planes formed parallel to the layer plane, at which incident light is "reflected" and structurally or destructively interferes with the Bragg condition. This makes individual diffraction reflections sharper, which in turn leads to a sharper color effect.

In one embodiment, it is provided that the embossing punch is provided in such a way that the embossed relief-like microstructure has lateral structure sizes in a range of 0.5 to 6 μm. In this case, for example, a plurality of lateral structures can form individual pixels, wherein a single pixel can then have a microstructure, for example a diffraction grating with a fixed lattice constant.

In a further embodiment it is provided that the embossing punch is provided in such a way that the embossed relief-like microstructure has vertical structure sizes in a range of 0.1 to 6 μm. In this case, all values in the range between 0.1 and 6 μm can be present in a microstructuring. For example, each pixel or each pixel may be assigned a local diffraction structure formed as a microstructure with a color value, so that a total of a parceling into individual reflective diffraction structures is present. In order to generate the corresponding color value, the microstructuring of a pixel can then be structured both laterally and vertically. The vertical microstructuring ensures that several network levels can be made available for each pixel or pixel.

In contrast, a pixel or pixel can also be formed by subpixels, wherein each subpixel comprises its own diffraction structure. A color value associated with the pixel or pixels can then be generated by color addition of the individual colors of the subpixels. The regions of the microstructuring associated with the subpixels can also be structured laterally as well as vertically.

A microstructuring formed on the surface can be exposed to external influences. In the case of security documents, this can be, for example, a mechanical stress due to the use or storage of the security document. Therefore, in a further embodiment it is provided that the embossing punch is provided in such a way that it has a raised region in the region of the relief-like microstructure, so that the relief-like microstructure formed after lamination is formed recessed with respect to extremal protrusions on a surface of the document body. By lowering the embossed microstructure this remains protected against mechanical stress and abrasion, for example, when the document is moved on a table top with downwardly facing, the tabletop facing, microstructuring. Since only the remaining surface of the document body rests on the table top, but the embossed microstructure has no direct contact with the tabletop, the embossed microstructuring remains protected.

The same protective effect can be achieved when forming a raised area or forming a plurality of raised areas which protect a microstructure formed on the surface of the document body from mechanical stress. In a further embodiment, it is therefore provided that the embossing punch is provided in such a way that it has a depression in at least one region, so that the relief-like microstructure formed after lamination is formed recessed with respect to an extremal protrusions formed by a raised region on a surface of the document body , The raised area ensures that, for example, a table top is kept at a distance from the microstructuring, as in the example above.

The microstructuring may be formed both on an upper side of the document body and on an underside of the document body. If substrate layers of polycarbonate are present on both sides of the document body, then a further lamination sheet can be provided with a further embossing stamp in order to form a microstructure on this side during lamination. Therefore, in a further embodiment, it is provided that a further lamination sheet is provided with a further embossing punch, wherein the further embossing punch likewise has a relief-like microstructure, so that in each case an embossed relief-like microstructure is formed during lamination both on an upper side and on an underside of the document body becomes. The dies for the top and the bottom can be different or the same.

In order to create a security feature via the microstructuring, which is visible when viewed in transparency, the document body must be transparent or at least translucent from the top to the bottom. In a further embodiment, it is therefore provided that the substrate layers are provided in such a way that they are made transparent at least in a partial area of the embossed relief-like microstructuring. The microstructuring can then be illuminated in a transparent manner, so that diffraction effects, for example caused by a point light source, can be seen in phantom.

The security of the security document can be further increased if additional information is incorporated into the microstructure. This can be achieved, for example, in that the microstructuring formed during lamination is deliberately locally destroyed again, for example in the form of letters, a graphic or an image. In an advantageous embodiment, it is therefore provided that the embossed relief-like microstructure after lamination is at least locally melted on a surface by means of laser irradiation and thereby structurally destroyed, whereby information is formed by the local melting. The information introduced by the local melting can also be entangled with the embossed microstructuring, so that an additional increase in security is achieved. The local reflow causes a material change without creating light absorbing areas such as blackening. An information stored in this way over changed areas information is then not reproducible for example by xerographic methods.

In order to obtain protection against contamination, abrasion and scratches after lamination, a lacquer layer can be applied to the embossed microstructure. In an advantageous embodiment, it is provided that after the lamination, a lacquer layer is applied to the embossed relief-like microstructuring. In particular, the applied lacquer is selected such that the embossed relief-like microstructuring is protected, but the diffraction effect still remains visible. The viscosity of the paint is chosen such that the paint creates a closed surface without leveling and affecting the optical properties of the microstructure. In particular, the lacquer after application and, if necessary, necessary curing should preferably have a greater hardness than polycarbonate, in which the microstructures are formed in order to be able to effectively withstand mechanical stress. For example, finely ground corundum can be used in such a paint.

In a further advantageous embodiment, it is provided that the embossed relief-like microstructuring is formed in several areas as a diffraction grating, each with different diffraction properties. This makes it possible, for example, to obtain different color impressions that can be detected when viewing the embossed relief-like microstructuring. The multiple areas of diffraction gratings, each with different characteristics, further enhances the security document's anti-counterfeiting security, as it becomes more difficult for a counterfeiter or imitator to falsify or imitate all areas in a way that they are found to be genuine.

In particular, the security against counterfeiting can be increased if one for the human Viewer immediate color effect is detectable and verifiable. This is the case, for example, with photographic images, since they are based on a color and perspective representation of the real world and thus directly correspond to the world of experience of the human being. In an advantageous development, it is therefore provided that the multiple regions are designed such that a reproduction of a photographic image is formed.

In a particularly advantageous embodiment, it is further provided that the plurality of areas are formed such that at least when viewed at a certain angle, a true color image is generated. The true color image may be, for example, a photographic image. The true colors ensure that the security document can be verified directly by a human observer. The true color image can also be a colored logo, a symbol or another motif.

It may be desired that an entire top or bottom of the security document be protected against counterfeiting and imitation. This allows for easy detection of whether manipulation or other interference has taken place anywhere on the entire top or bottom. Therefore, it is provided in an advantageous embodiment that the embossing punch is provided such that the embossed relief-like microstructure has an extension over an entire area of one side of the document body. It is thereby achieved that the diffraction effect is formed over the entire surface of the side of the document body. The entire surface is then protected against attack, since a counterfeiting or imitation destroys the embossed relief-like microstructuring and thereby makes it recognizable in a later verification. Also, the introduction of a new embossed relief-like microstructuring is hampered by forming over the entire surface of one side of the document body. Such local insertion in the area that was forged would become visually recognizable by a different diffraction effect and a visual interface between the counterfeit and the original area on the side of the document body which would interrupt a uniform and coherent visual impression.

In a further development, it is provided in particular that the embossing punch is designed in such a way that the embossed relief-like microstructure has a two-dimensional diffraction grating at least in a subarea, so that a diffraction pattern is visible when viewed with a point light source and the diffraction pattern when viewed with diffuse light however, is not visible. In this case, the two-dimensional diffraction grating may, for example, be a periodically formed microstructure in both dimensions. When viewed with a point light source, a regular diffraction pattern is then visible, the diffraction pattern usually being composed of punctiform or elliptical elements. Depending on the type of point light source used, the elliptical elements may show a color gradient. On the other hand, when viewed with diffuse light, generated scattered reflections overlap on average so that no diffraction pattern is visible. For example, a diffraction effect that is so pronounced can be easily produced by means of a white-light point light source (e.g., a white LED) installed in today's smartphones. Thus, a security feature is available, which can be checked by means of simple methods and devices in terms of a level 1 feature.

The two-dimensional diffraction grating can be formed, for example, by microstructuring in the form of two sinusoidal functions superimposed in orthogonal directions ("egg-box" structure). Furthermore, however, it is also possible to superimpose several periodic structures, even with different periodicity. Thus, for example, two non-orthogonally aligned strip gratings may be formed in the microstructure.

In particular, for example, security documents such as passports, ID cards or other identification cards can be provided with a microstructure comprising an entire area of an upper side and / or lower side of the security document, so that the entire area is protected against counterfeiting or imitation. Such a security document can then be checked for authenticity by means of the white-light point light source of a smartphone. Any manipulation of an information layer underlying the embossed relief-like microstructure would lead to a destruction of the microstructuring. Such destruction and also a subsequent reworking of the destroyed site could easily be checked by means of the point light source, since both the destruction and the seams of subsequently added microstructures become visible to the human observer.

In order to further increase the security of the embossed relief-like microstructuring, it is provided in an advantageous embodiment that the embossing punch is provided in such a way that the embossed relief-like microstructure carries holographic information at least in a partial region.

Of course, a security document having one of the security features described above may also include other security features. For reasons of clarity, however, this will not be described in detail here. For example, it may be provided that the security document has an internal hologram, an integrated microchip, a security print or another security, tactile or machine-detectable security feature. The security document may also be printed.

The described security features and the security document with the described security features can also be checked by machine in addition to a check by a human observer. Thus, for example, a photographic image of the diffraction effect can be detected and evaluated, for example by examining an entire surface of the security document, possibly by detecting a plurality of photographic images at different positions of the surface, for the presence of the diffraction effect. For this purpose, it is also possible to spectroscopically dissect the diffraction effect by means of an optical arrangement and to investigate for the presence of specific lines or areas in the spectrum. If there is an expected diffraction effect, the security document is judged genuine. On the other hand, if the expected diffraction effect can not be demonstrated, the security document is not considered genuine.

The invention will be explained in more detail with reference to preferred embodiments with reference to the figures. Hereby show:

1a to 1d a schematic representation of method steps of an embodiment of the method for producing a security document;

2 a schematic representation of a document body with an embossed relief-like microstructuring, which causes a diffraction effect;

3 a schematic representation of a stamping die, in which the relief-like microstructure is designed to protect against mechanical stress on a raised area;

4 a schematic representation of a stamping die, in which the relief-like microstructure is protected by an adjacent raised area from mechanical stress;

5 a schematic representation of a two-dimensionally periodically formed relief-like microstructuring for generating a two-dimensional diffraction effect over an entire surface of a security document;

6a a schematic representation of a detected by a human observer under diffuse lighting top of a security document with the relief-like microstructuring according to the embodiment of 5 ;

6b a schematic representation of the detected by a human observer under illumination with a white light point light source top of the security document with the relief-like microstructuring according to the embodiment of the 5 ;

6c a schematic representation of the detected by a human observer under illumination with a white light point light source top of the security document with the relief-like microstructuring according to the embodiment of the 5 elsewhere on the top of the security document;

7 a schematic representation of the recorded by a human observer top of an embossed relief-like microstructuring, which represents a photographic reproduction as true color image.

The 1a to 1d show a schematic representation of the sequence of the method steps of a method for producing a security document 1 , In a first step ( 1a ) become substrate layers 2 provided. The substrate layers 2 are all made of polycarbonate (PC). This is, for example, an upper substrate layer 3 , a middle substrate layer 4 which carries, for example, printing information and / or is laser-capable, and a lower substrate layer 5 ,

In the next step ( 1b ) become the individual substrate layers 2 . 3 . 4 . 5 to a substrate layer stack 6 summarized and in a lamination device 7 with an upper lamination sheet 8.1 and a lower lamination sheet 8.2 positioned. The upper lamination sheet 8.1 includes an embossing stamp 9 , which is a relief-like microstructuring 10 having.

Subsequently ( 1c ) becomes the substrate layer stack 6 laminated by the substrate layer stack 6 at elevated temperature under pressure 13 is compressed. At this time, the temperature in the substrate layer stack becomes 6 increased so that the substrate layers 6 connect at the interfaces and a monolithic document body 11 is trained. In this document body 11 are the interfaces no longer present between the substrate layers, since the plastic of the individual substrate layers has joined together at the molecular level. On a top 12 of the document body 11 where there is a topmost layer of material from the substrate layer 3 made of polycarbonate (PC), is the die 9 imprinted so that the relief-like microstructuring of the stamping die 9 in the top 12 of the document body 11 transfers and there an embossed relief-like microstructure 14 formed.

In the last procedural step ( 1d ) become the lamination sheets 8th .1, 8th .2 removed and the finished document body 11 of the security document 1 can be removed.

The resulting security document 1 is in 2 shown schematically. This points at an upper side 12 of the document body 11 a directly in the polycarbonate (PC) embossed relief-like microstructuring 14 in the form of a diffraction grating 36 on. The diffraction grating 36 is designed such that this has a diffraction effect 16 which is caused by a human observer 15 can be detected and thus an easy to verify level 1 feature 17 for the security document 1 represents. Such a diffraction effect 16 For example, a diffraction effect 16 to be with a human viewer 15 gives the visual impression of a dot or stripe pattern, where the dots and stripes can show color gradients (see 6b and 6c ). Such a diffraction effect 16 but can also be a true color image, for example, a reproduction of a photographic image (see, for example, the embodiment in 7 ).

In addition to a verification of the security document 1 by a human viewer 15 Of course, a mechanical authenticity check is possible. Thus, for example, a photographic image of the diffraction effect can be detected and evaluated, for example by examining an entire surface of the security document, possibly by detecting a plurality of photographic images at different positions of the surface, for the presence of the diffraction effect. For this purpose, it is also possible to spectroscopically dissect the diffraction effect by means of an optical arrangement and to investigate for the presence of specific lines or areas in the spectrum. If there is an expected diffraction effect, then the security document becomes 1 judged as genuine. On the other hand, if the expected diffraction effect can not be proven, the security document will become 1 for not real.

3 shows an embodiment in which the die 9 is provided such that it has a in the region of the relief-like microstructure 10 sublime area 18 having. Except for a use of a differently shaped embossing stamp 9 Otherwise, the process steps correspond to those in the 1a to 1d described method steps. The sublime area 18 of the stamp 9 ensures that the formed after lamination relief-like microstructuring 14 with respect to a through a surface of a top 12 of the document body 11 defined macroscopic level 19 in a lowered depression 20 is trained. The lowered depression 20 ensures that the embossed relief-like microstructuring 14 is protected against mechanical stress. Is the document body 11 for example, with the top 12 on a tabletop, so the embossed relief-like microstructuring does not touch the tabletop, as they are within the lowered recess 20 lies. By preventing the direct contact remains the embossed relief-like microstructuring 14 thus protected against mechanical action.

4 shows a further embodiment in which the die 9 is provided such that this at least in one of the relief-like microstructure 10 adjacent area depressions 21 having. Except for the use of a differently shaped embossing stamp 9 Otherwise, the process steps correspond to those in the 1a to 1d described method steps. The wells 21 of the stamp 9 make sure that after lamination one passes through a surface of a top 12 of the document body 11 defined macroscopic level 19 sublime areas 22 be formed. As with the lowered depression 20 in 3 , make the embossed relief-like microstructuring 14 adjacent raised areas 22 for that the embossed relief-like microstructuring 14 is protected against mechanical stress. Lateral to the document body 11 attacking mechanical impacts are from the raised areas 22 intercepted and thus protect the embossed relief-like microstructuring 14 against mechanical stress and abrasion.

5 shows a schematic representation of a two-dimensionally periodically formed relief-like microstructuring 14 for generating a two-dimensional diffraction effect over an entire area of an upper surface 12 a security document 1 , The relief-like microstructuring 14 is essentially as two in the x-direction 23 and y direction 24 running superimposed sine functions formed. The period lengths 25 are typically in the range of the wavelength of visible light. As the embossed relief-like microstructuring 14 periodically in two directions 23 . 24 Also, an induced diffraction effect in two directions is periodic. By the two-dimensionally periodically formed relief-like microstructuring 14 over the entire surface of the top 12 of the security document 1 can the security document 1 be secured in the entire area against a forgery. To verify the authenticity of such a security document 1 Then, the entire surface is checked for the presence of the diffraction effect by a human observer or in a machine manner.

The 6a . 6b and 6c show schematic representations of one of a human observer 15 captured top 12 a security document 1 with the relief-like microstructuring according to the in the 5 described embodiment under diffuse illumination ( 6a ) and under lighting 26 with a white light point light source 27 at two different lighting and viewing positions on the security document 1 ( 6b and 6c ).

Under diffused lighting 26 ( 6a ) is a diffraction effect for a human viewer 15 not recognizable. The diffraction patterns and reflections average under the diffuse illumination 26 path. In this example, the human viewer sees 15 only the top of the document body 12 which includes personalization information, such as a passport photo 28 and a text 29 ,

In 6b becomes the top 12 of the security document 1 with a white light point light source 27 illuminated. As opposed to the one in the 6a is only a source of illumination, is a diffraction effect 30 for the human viewer 15 visible, noticeable. In this case, for example, regularly arranged from a center 31 outwardly radiating stripes 32 Visible, each of which from the center point a gradient from white to blue, green, yellow towards red. The middle-point 31 himself appears largely white.

Will the white light point light source 27 laterally towards a plane of the top 12 of the security document 1 shifted, the result is the same diffraction effect 30 , This situation is schematic in 6c shown. The one with the human viewer 15 The resulting impression is largely the same as that in the 6b illustrated situation. Since the embossed relief-like microstructure is formed identically over the entire surface, that is in the human observer 15 resulting optical impression also at other positions of the top 12 largely the same.

In this way, thus, the entire surface of the top 12 of the security document 1 be protected against counterfeiting or imitation. With relatively simple means, such as the white light point light source 27 the camera of a modern smartphone, the diffraction effect can 30 for the human viewer 15 be made visible.

A human viewer 15 can thus easily a fastness check of the entire surface of the top 12 of the security document 1 make. Is for example the passport picture 28 has been changed, this has a destruction of the relief-like microstructuring on the top 12 of the security document 1 result. This will also affect the diffraction effect 30 at this point the top 12 have, as an exact restoration of the embossed relief-like microstructure in the area of the passport photograph 28 is almost impossible or can be achieved only with great technical effort.

7 shows a schematic representation of a human observer 15 captured top 12 a security document 1 with an embossed relief-like microstructure, which by a diffraction effect 30 a photographic reproduction as true color image 33 represents. In this example, the security document becomes 1 from a white light source 37 illuminated. The impression of a true color picture 33 is achieved in that the embossed relief-like microstructure is formed in several areas as a diffraction grating, each with different diffraction properties. Further, the plurality of regions are formed to form a reproduction of a photographic image. This can be done, for example, by dividing the multiple areas into individual pixels 34 be achieved. The pixels 34 consist of a diffraction grating, each with different diffraction properties, allowing for different angles for adjacent pixels 34 Diffraction patterns or reflections of different wavelengths are generated. Are the pixels 34 formed sufficiently small, for example in the range of several to a few tens of microns, so an optical impression of true colors can be achieved by color addition. The diffraction grating of the pixels 34 and the plural areas are now formed such that at least when viewed at a certain angle, a true color image 33 the photographic reproduction is produced. The true color image 33 Of course it can be different from pixels 34 be generated.

LIST OF REFERENCE NUMBERS

1

SAicherheitsdokument

2

substrate layer

3

upper substrate layer

4

middle substrate layer

5

lower substrate layer

6

Substrate layer stack

7

Laminationsvorrichtung

8.1

Upper lamination sheet

8.2

lower lamination sheet

9

dies

10

relief-like microstructuring

11

document body

12

top

13

print

14

embossed relief-like microstructuring

15

human viewer

16

diffraction effect

17

Level 1 feature

18

raised area

19

macroscopic level

20

lowered recess

21

deepening

22

raised area

23

x-direction

24

y-direction

25

period length

26

diffused lighting

27

White light point source

28

passport photo

29

text

30

diffraction effect

31

Focus

32

strip

33

True-color image

34

pixel

35

Area

36

diffraction grating

37

White light source

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102012211077 A1 [0004]

Claims (17)

Method for producing a security document ( 1 ), comprising the following steps: providing substrate layers ( 2 . 3 . 4 . 5 ), wherein at least one of the substrate layers ( 3 ) is made of polycarbonate, providing a laminating sheet ( 8.1 . 8.2 ) with stamp ( 9 ), the die ( 9 ) a relief-like microstructuring ( 10 ), laminating the substrate layers ( 2 . 3 . 4 . 5 ), the lamination sheet ( 8.1 ) with the stamp ( 10 ) on an outer upper side ( 12 ) of the at least one substrate layer ( 3 ) is arranged in polycarbonate in such a way that during lamination the relief-like microstructure ( 10 ) of the embossing stamp ( 9 ) on the substrate layer ( 3 ) transmits polycarbonate and by laminating a document body ( 11 ) is formed, and wherein the embossing stamp ( 9 ) is provided such that the embossed relief-like microstructure ( 14 ) at least in one region as a diffraction grating ( 36 ) for causing a diffraction effect ( 16 . 30 ) is formed. Method according to claim 1, characterized in that the stamp ( 9 ) in such a way that the embossing-like microstructuring embossed during lamination ( 14 ) also has vertically pronounced microstructures with different structure depths in addition to laterally pronounced microstructures. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided such that the embossed relief-like microstructure ( 14 ) has lateral feature sizes in a range of 0.5 to 6 μm. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided such that the embossed relief-like microstructure ( 14 ) has vertical feature sizes in a range of 0.1 to 6 μm. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided in such a way that this one in the region of the relief-like microstructuring ( 10 ) raised area ( 18 ), so that the relief-like microstructuring formed after lamination ( 14 ) deepens with respect to extremal protrusions on a surface of the document body ( 1 ) is trained. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided such that it at least in one area a depression ( 21 ), so that the relief-like microstructuring formed after lamination ( 14 ) deepened by a raised area ( 22 ) formed extreme projections on a surface of the document body ( 1 ) is trained. Method according to one of the preceding claims, characterized in that a further lamination sheet ( 8.2 ) is provided with a further embossing stamp, wherein the further embossing stamp likewise has a relief-like microstructure ( 10 ), so that when laminating both on a top ( 12 ) as well as on an underside of the document body ( 11 ) in each case an embossed relief-like microstructuring ( 14 ) is formed. Method according to one of the preceding claims, characterized in that the substrate layers ( 2 . 3 . 4 . 5 ) are provided such that they are at least in a partial region of the embossed relief-like microstructuring ( 14 ) are transparent. Method according to one of the preceding claims, characterized in that the embossed relief-like microstructuring ( 14 ) is at least partially locally melted at least in a partial area on a surface by means of laser irradiation and thereby structurally destroyed, whereby information is formed by the local melting. Method according to one of the preceding claims, characterized in that after lamination, a lacquer layer on the embossed relief-like microstructuring ( 14 ) is applied. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided such that the embossed relief-like microstructure ( 14 ) in several areas ( 35 ) as a diffraction grating ( 36 ) is formed with different diffraction properties. A method according to claim 11, characterized in that the plurality of areas ( 35 ) are formed such that a reproduction of a photographic image is formed. A method according to claim 12, characterized in that the plurality of areas ( 35 ) are formed such that at least when viewed at a certain angle a true color image ( 33 ) is produced. Method according to one of the preceding claims, characterized in that the stamp ( 9 ) is provided such that the Embossed relief-like microstructuring ( 14 ) an extent over an entire area of a page ( 12 ) of the document body ( 11 ) having. Method according to one of the preceding claims, characterized in that the embossing die ( 9 ) is designed such that the embossed relief-like microstructuring ( 14 ) at least in a partial area a two-dimensional diffraction grating ( 36 ), so that when viewed with a point light source ( 27 ) a diffraction pattern is visible when viewed with diffuse light ( 26 ) the diffraction pattern is not visible. Method according to one of the preceding claims, characterized in that the embossing die ( 9 ) is provided such that the embossed relief-like microstructure ( 14 ) carries holographic information at least in a subarea. Security document ( 1 ), comprising: a document body ( 11 ) with a top side ( 12 ) and one of the top ( 12 ) opposite bottom, wherein the document body ( 11 ) has at least one material layer of polycarbonate, at least one security feature, wherein the at least one security feature is characterized by an embossed relief-like microstructure ( 14 ) is formed in the at least one material layer of polycarbonate, and wherein the embossed relief-like microstructure ( 14 ) at least in one region as a diffraction grating ( 36 ) for causing a diffraction effect ( 16 . 30 ) is trained.

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