DE102009057358A1 - Security element for foil element - Google Patents

Abstract

The invention relates to a security element (12) for security papers, documents of value and the like having a substrate (20) and a film element (30) applied to the substrate (20). According to the invention, it is provided that the film element has a first feature area (32) and that in the substrate (20) below the first feature area (32) of the film element (30) a substrate chamber (24) is formed, in the region of which the film element (30 ) is spaced from the substrate (20) and in the region of which the substrate (20) is provided with a second feature region (22) cooperating with the first feature region (32) to produce a security feature having a predetermined overall effect.

Description

The invention relates to a security element for security papers, documents of value and the like, comprising a substrate and a film element applied to the substrate.

Data carriers, such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction. The security elements can be designed, for example, in the form of a security thread embedded in a banknote, a covering film for a banknote with a hole, an applied security strip, a self-supporting transfer element.

In the case of banknotes and other value documents, human characteristics are often used as security features, for example watermarks, hologram elements, thermochromic or optically variable colors, security threads, transparent registers or window areas with incident light and transmitted light information. In many human features a foil element is provided which carries the authenticity mark to be tested. In some cases, however, the human characteristics used are imitable or the authenticity check is too complicated or not clear enough for the layman.

Proceeding from this, the present invention seeks to provide a security element of the type mentioned above, which avoids the disadvantages of the prior art and which allows a simple, rapid and clear authenticity check by the user especially at high counterfeit security.

This object is achieved by the security element having the features of the main claim. An appropriate data carrier and production method for a security element or a data carrier are specified in the independent claims. Further developments of the invention are the subject of the dependent claims.

According to the invention, it is provided in a generic security element that the film element has a first feature area and that a substrate chamber is formed in the substrate below the first feature area of the film element, in the region of which the film element is spaced from the substrate. Further, the substrate in the region of the substrate chamber is provided with a second feature area, which cooperates with the first feature area to produce a security feature with a predetermined overall effect.

As a result of the interaction of the spaced-apart feature areas, the security element generally exhibits a viewing angle-dependent appearance which can not be reproduced by copying technology. The interaction of the feature areas also allows a variety of visually attractively designed security features that can be easily and quickly tested by the layman, since it is sufficient for a viewing angle-dependent appearance for authentication, to tilt the security element and to observe the change in appearance. With the help of a suitable sensor system, the authenticity check can also be performed by machine.

The overall effect of the security element results from the interaction of the two feature areas. As illustrated below with reference to some concrete embodiments, the two feature areas are not unconnected side by side in the context of the present invention, but only together give the desired viewing impression.

In an advantageous variant of the invention, the film element is connected to the substrate via an adhesive layer, which is recessed at least in the region of the substrate chamber. Alternatively, the film element is connected via an adhesive layer to the substrate and the substrate is provided at least in the region of the substrate chamber with a non-stick coating. An embodiment is also conceivable in which the film element is connected to the substrate via an adhesive layer, which is recessed at least in the area of the substrate chamber, and the substrate is provided with a non-stick coating, at least in the area of the substrate chamber. Furthermore, in a further variant of the invention, the substrate may be provided with an anti-adhesion coating at least in the region of the substrate chamber, and the film element may be connected to the substrate by an adhesive layer substantially not recessed in the region of the substrate chamber. In the case of the last-mentioned variant of the invention, it is also conceivable for the adhesive layer to be arranged over the full area or with a recess in the region of the substrate chamber and the non-stick coating on the adhesive layer or the film element, and the film element is connected to the substrate via the adhesive layer. If an antistick coating is provided on the substrate and / or the film element at least in the region of the substrate chamber, it therefore plays only a minor role, whether the adhesive layer is formed over the entire surface or recessed in the region of the substrate chamber.

The non-stick coating can be formed in particular by a silicone-containing color. It can be colorless or colored and, in the latter case, form at least part of the second feature area. In addition, the non-stick coating may contain additional visually invisible features, such as luminescent or infrared absorbers.

The substrate chamber may be rectangular or polygonal, but rounded outlines are preferred, in particular as a circle, oval or any free form with rounded corners. Advantageously, the shape of the substrate chamber can also form a pattern, character or a coding.

The substrate chamber may form a single chamber or may consist of several sub-chambers. The sub-chambers may each contain a similar feature area or different feature areas. Also, the sub-chambers may be formed as any free form and in the form of patterns, characters or a coding. The shape of the chamber or the sub-chambers can be based on the information content of the feature areas, for example, represent the same information or complement each other with the feature areas to a total information.

The substrate chamber may be formed over a large area, for example with a dimension of up to (10 × 20) mm ² , or with a small area, for example of (3 × 5) mm ² or less. In the case of large-area substrate chambers, at least one support element can be provided which ensures a constant distance from the substrate and the film element. Such support elements constitute partial chamber boundaries.

The distance from substrate and film element can be constant depending on the desired overall impression, vary in discrete steps, or vary continuously. As will be explained in more detail below, the distance between substrate and film element is typically in the range of about 5 microns to about 140 microns.

Advantageously, the substrate is formed from a substantially inelastic, preferably plastically deformable material, while the film element is advantageously formed from an elastic, preferably hardly or not plastically deformable material. The preferably plastically deformable materials can at the same time also be highly viscous materials, while the preferably barely or non-plastically deformable materials can generally also be low-viscosity materials at the same time. When embossing the substrate / film structure, a substantially greater permanent deformation is then produced in the substrate than in the film element, so that a cavity in the form of the desired substrate chamber is formed between the substrate and the film element.

The film element can carry the first feature region on its upper side, that is to say the outer side of the substrate chamber, or on its lower side, that is to say the inner side of the substrate chamber, the first feature region being protected from external influences by the film element itself in the latter case. The first feature region can also be present partially on the upper side and partly on the underside of the film element, wherein both a matched and an un-matched arrangement of the upper and lower regions arranged subregions is possible.

In an advantageous embodiment, the film element has a multilayer structure, wherein the first feature region is preferably arranged in the interior of the multilayer structure and thereby protected. The multi-layered structure may for example consist of a film and a protective lacquer layer, between which the first feature region is arranged.

The first and second feature areas may be matched or unassembled with each other. In a registered arrangement, the first feature area of the film element is advantageously arranged with a registration accuracy of +/- 1 mm or less to the second feature area. By using an anti-adhesion layer on the substrate, particularly high registration accuracies can be generated between the second feature area and the substrate chamber, as described in more detail below.

In all designs, the second feature area is formed, for example, by a printing layer, for example a printing layer applied by means of offset, simultaneous, flexographic or screen printing or an embossed structure. The first feature area is advantageously formed by a printed layer, an embossed structure, a diffractive structure, a partially metallized structure or by a microoptical structure, in particular by a microlens grid.

In an advantageous variant of the invention, it is provided that the second feature area contains a high-resolution point or line grid and the first feature area generates a viewing angle-dependent moiré effect in cooperation with the second feature area, to which the first feature area preferably a high-resolution point or line grid, a microlens grid or contains holographic information.

According to a likewise advantageous variant of the invention, it is provided that the first Feature area contains a transparent motif, and the second feature area contains a reflective or highly reflective, in particular metallic or non-metallic surface, which provides a backlight for incident light of the transparent motif of the first feature area. A mirror surface in the second feature region can also be used in other ways, for example for generating a real image of a motif arranged in the first feature region, which seems to float above the film element. It should be noted here that a highly reflective surface can also be realized by a highly reflective lacquer (high gloss lacquer).

In a further advantageous variant of the invention, it is provided that the first feature region contains a motif, and the second feature region contains a luminescent surface which, when excited, provides backlighting for the motif of the first feature region. The luminescent surface may be designed in particular for excitation by UV radiation or by visible radiation. In particular, the luminescent light can represent a backlight for the motif of the first feature area or can also illuminate colors used there.

According to a further advantageous variant of the invention, the first feature area and the second feature area contain the same screened motif, so that, in interaction, a scene-angle-dependent motif enhancement results.

According to a further advantageous variant of the invention, the first feature region contains a motif with at least two metameric colors and the second feature region contains a metameric filter.

In all designs, the film element may be a film strip or a foil patch. The security element described may be part of a data carrier, in particular a security paper or a value document, and form, for example, an integrated subarea of a banknote. In other embodiments, the security element is first produced as a separate element and subsequently applied to a data carrier, in particular a security paper or a value document, or introduced into the data carrier.

• – ein Folienelement bereitgestellt und mit einem ersten Merkmalsbereich versehen wird,
• – ein Sicherheitselement-Substrat bereitgestellt und mit einem zweiten Merkmalsbereich versehen wird,
• – das Folienelement so auf das Sicherheitselement-Substrat aufgebracht wird, dass in einem Kammerbereich der erste und zweite Merkmalsbereich übereinanderliegen und dort keine Haftung zwischen Substrat und Folienelement besteht, und
• – das Substrat mit dem aufgebrachten Folienelement verprägt wird, um in dem Kammerbereich eine Substratkammer zu bilden, in deren Bereich das Folienelement von dem Sicherheitselement-Substrat beabstandet ist.

The invention also includes a method for producing a security element for security papers, value documents and the like, in which

• A film element is provided and provided with a first feature area,
• A security element substrate is provided and provided with a second feature area,
• - The film element is applied to the security element substrate so that in a chamber area of the first and second feature area are superposed and there is no adhesion between the substrate and the film element, and
• - The substrate is embossed with the applied film element to form a substrate chamber in the region of the chamber, in the region of which the film element is spaced from the security element substrate.

In an advantageous variant of the method, the film element is provided on its underside to be connected to the security element substrate with an adhesive layer which has an adhesive recess at least in the area of the substrate chamber to be produced. Alternatively, the film element in the region of the substrate chamber to be produced on a full-surface adhesive layer or in the region of an adhesive recess can be provided with a non-stick coating.

According to a likewise advantageous variant of the method, the security element substrate is provided with a non-stick coating, at least in the area of the substrate chamber to be produced. In this case, the film element can be coated on its underside over the entire surface or with a recess in the region of the substrate chamber to be produced with adhesive. This variant of the method offers the advantage that the non-stick coating can be applied to it in the same printing step as the second feature region and thus without register variations. Since the substrate chamber can arise only in the region in which there is no adhesion between the substrate and the film element, the substrate chamber can thereby be adapted with high precision to the second feature region.

Advantageously, the film element is fitted with the first feature area adapted to the second feature area of the security element substrate, preferably with a registration accuracy of +/- 1 mm or less.

To produce the substrate chamber, the security element substrate with the applied film element is preferably embossed with an embossing machine or as a blind embossing. According to an advantageous variant, it is provided to produce the substrate chamber with a stitch printing plate in the stitch print as blind embossing and at the same time in the environment of the substrate chamber or in other areas of the substrate with ink-carrying To produce areas of the same Stichdruckplatte a colored intaglio print motif.

The invention further comprises a data carrier, in particular a value document, such as a banknote, an identification card or the like, which is equipped with a security element of the type described or with a security element produced according to the method described above.

The invention further includes a method for producing a data carrier, in particular a value document, such as a banknote, identity card or the like, in which a data carrier substrate is provided and a security element of the type described is applied to the data carrier substrate or introduced into the data carrier substrate.

• – ein Folienelement bereitgestellt und mit einem ersten Merkmalsbereich versehen wird,
• – ein Datenträgersubstrat bereitgestellt und mit einem zweiten Merkmalsbereich versehen wird,
• – das Folienelement so auf das Datenträgersubstrat aufgebracht wird, dass in einem Kammerbereich der erste und zweite Merkmalsbereich übereinanderliegen und dort keine Haftung zwischen Datenträgersubstrat und Folienelement besteht, und
• – das Datenträgersubstrat mit dem aufgebrachten Folienelement verprägt wird, um in dem Kammerbereich eine Substratkammer zu bilden, in deren Bereich das Folienelement von dem Datenträgersubstrat beabstandet ist.

The invention also encompasses a method for producing a data carrier, in particular a value document, such as a banknote, identity card or the like, in which

• A film element is provided and provided with a first feature area,
• A data carrier substrate is provided and provided with a second feature area,
• The film element is applied to the data carrier substrate in such a way that the first and second feature areas are superimposed in a chamber area and there is no adhesion between the data carrier substrate and the film element, and
• - The data carrier substrate is embossed with the applied film element to form in the chamber region, a substrate chamber in the region of which the film element is spaced from the data carrier substrate.

In this variant of the method, the security element substrate is the substrate of the data carrier itself, so that the security element is produced as part of the data carrier and does not have to be subsequently applied. The embodiments of the method for producing a security element that are described as preferred can be used in the same way in this method.

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. The various embodiments are not limited to use in the specific form described, but can also be combined with each other.

Show it:

1 a schematic representation of a banknote with a security element according to the invention,

2 a cross section through the banknote of 1 along the line II-II,

3 the security element of 2 schematically in supervision,

4 in (a) the visual impression of the security element of the 2 when viewed vertically and in (b) viewed obliquely,

5 in (a) to (e) intermediate steps in the production of a security element according to the invention,

6 an intermediate step in an alternative production variant according to the invention,

7 - 11 further security elements according to the invention in cross section, and

12 - 15 variants according to the invention of the design of the substrate chamber, partially in cross section and partly in plan view, wherein in the plan views only the outline of the substrate chamber and in the cross sections only the substrate chamber, the film element and the adhesive layer is shown.

The invention will now be explained using the example of security elements for banknotes. 1 shows a schematic representation of a banknote 10 that with a security element according to the invention 12 Is provided. The security element 12 includes one in the banknote paper 20 introduced substrate chamber 24 that with a foil patch 30 is covered. In the area of the substrate chamber 24 is both the banknote paper 20 as well as the foil patch 30 each provided with a security feature area, wherein the two security feature areas together a viewing angle-dependent visual overall impression of the security element 12 produce.

The structure and operation of the security element 12 will now be related to the 2 to 4 described in more detail. It shows 2 a cross section through the banknote 10 along the line II-II of 1 . 3 shows the security element 12 schematically in supervision and 4 shows in 4 (a) the visual impression of the security element 12 when viewed vertically and in 4 (b) the visual impression when viewed obliquely.

As in the 2 and 3 is shown in the banknote paper 20 trained substrate chamber 24 with a foil patch 30 covered by an adhesive layer 26 with the banknote paper 20 connected is. The adhesive layer 26 is in the area of the substrate chamber 24 recessed so that there is no liability between banknote paper 20 and foil patch 30 consists.

In the area of the substrate chamber 24 is also the foil patch 30 with a first feature area 32 and the banknote paper 20 with a second feature area 22 Mistake. In the embodiment shown, the second feature area is 22 formed by a printing layer, which represents a high-resolution dot screen. Typically, this is banknote paper 20 also outside the chamber area with a print 28 provided, the feature area 22 also part of such an imprint 28 be and can be applied together with this.

The first feature area 32 of the foil patch 30 is also formed in the exemplary embodiment by a printing layer, which represents a high-resolution dot matrix. The two dot patterns 22 . 32 are through the substrate chamber 24 separated and arranged at a distance d spaced.

Depending on the embodiment, this distance is between approximately 5 μm and approximately 140 μm, the distance depending, in particular, on the depth of the substrate chamber, the thickness of the adhesive layer, the thickness of the film element and the thickness of the first and second feature regions.

The distance d can, as in the embodiment of 2 , be constant, or may vary within the substrate chamber in discrete steps or continuously.

Due to the spaced arrangement, the two dot patterns of the feature areas 22 . 32 be coordinated in a conventional manner so that there is a viewing angle-dependent moiré effect. For example, the dot patterns can be matched to one another such that, when viewed vertically, a grid 40 without information content is visible, as in 4 (a) shown, and that after tilting the security element 12 oblique viewing a predetermined information 42 , such as the denomination "50" of the banknote 10 comes to light, as in 4 (b) shown.

The second feature area 22 of the substrate 20 can be applied by means of a printing process, for example in offset printing, or can be produced in other designs by a hot or cold embossing process. Instead of a dot matrix, the feature area 22 For example, a line grid or a combination of dot and line grid included.

To the first feature area 32 of the foil patch 30 applies, in addition to printing processes, such as gravure or offset printing method, in other designs, a partial metallization and / or a hot or cold embossing process into consideration. Instead of a dot matrix, the first feature area 32 Also included is a line grid, a combination of dot and line grids, a microlens grid, or holographic information.

In all cases, the interaction occurs between the raster of the first feature area 32 and the spaced apart grid of the second feature area 22 a moiré effect with an angle-dependent information. Contains the first feature area 32 Microlenses, so may be at locally different curvature of the substrate chamber 24 give a perspective dependent on the focus. The image impression can then change in a manner predetermined by the curvature of the substrate chamber depending on the viewing angle between a sharply magnified motif and a blurred or diffuse image.

The described security elements are not reproducible due to their viewing angle-dependent appearance copying technology and therefore offer a high protection against counterfeiting. In addition, by the interaction of the two feature areas a variety of visually attractive security features can be realized. In addition to the moiré features already described, further concrete embodiments for visually attractive security features are described in more detail below.

For producing a security element according to the invention, such as the security element 12 of the 1 to 4 , can be done as follows:
In a first step, a security element substrate 50 provided and with a desired second feature area 52 provided, as in 5 (a) shown. As a substrate 50 Preferably, a plastically deformable, low-elastic material is used to permanent deformation in the subsequent embossing step ( 5 (e) ) to reach. In particular, cotton-based papers, as are customary in the banknote sector, come into consideration.

Of course, it is also possible to use paper which contains a proportion x of polymeric material, where x can be between 0 and 100% by weight.

The substrate may also be formed as a multilayer composite, in particular as a paper-film composite. The films of the composite can be z. Example of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA) may be formed. Such a composite is characterized by an extremely high stability, which is for the durability of the security element of great advantage. Also, these composite materials can be used in certain climatic regions of the earth with great advantage.

In a particularly preferred variant of the invention, the paper-film composite has an inner base paper and two outer film layers, as in the document EP 1 545 902 B1 , the disclosure of which is included in the present description, described in more detail. Also advantageous is the inverse structure of a paper-film composite, in which an inner film is provided with two outer layers of paper.

All materials used as a substrate may have additives which serve as further authenticity features. It is primarily to think of luminescent, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, for. B. a UV or IR radiation emitting radiation source, can be excited to produce a visible or at least detectable luminescence.

The feature area 52 can be part of an applied coating 54 be, or can be applied separately.

Next is a film element 60 provided and with a desired first feature area 62 provided, as in 5 (b) shown. The foil element 60 can be a foil strip or a foil patch. For the foil element 60 Preferably, a slightly viscous but elastic material is used to achieve the lowest possible deformation in the subsequent embossing step. For example, the film element 60 a plastic film of PE, PP, PES or the like. The film element is preferably transparent in the initial state or provided with a full-surface colored transparent coloring or printing.

The foil element 60 is on its underside with an adhesive layer 64 provided, in the region of the substrate chamber to be generated an adhesive recess 66 has, as in 5 (c) shown. In order to protect the substrate chamber from external influences, in particular from contamination, it has proven useful if the film element has an adhesive area of at least 2 mm wide 64 on the edge 68 the film has.

Then the foil element becomes 60 in the area 72 the substrate chamber to be generated is passed or unpatterned onto the substrate 50 applied, as in 5 (d) shown. Through the adhesive recess 66 there is no adhesion between substrate in this area 50 and foil element 60 ,

After the application of the film element 60 is by embossing the substrate 50 the desired substrate chamber 70 in the substrate 50 generated. The embossing can be done on a stamping machine or in stitch print as blind embossing. Preferably, the embossing is carried out as a negative embossing on the front side of the film element 60 , Due to the selected material properties of substrate 50 and foil element 60 becomes due to the embossing step in the substrate 50 produces a much greater permanent deformation than in the film element 60 , so that between substrate 50 and foil element 60 a cavity in the form of the desired substrate chamber 70 forms, as in 5 (e) illustrated.

In the mechanical deformation of the substrate 50 by the embossing process is usually the bottom 58 of the substrate 50 deformed. However, this deformation of the bottom is not essential in the context of the present invention and therefore not shown in the schematic figures.

To protect the substrate chamber 70 become the substrate 50 and the film element 60 after the generation of the chamber 70 expedient neither front nor printed on the back. The two feature areas 62 . 52 Therefore, as described above, advantageously applied to the substrate surface or the film element prior to the generation of the chamber. However, a two-sided stitch print is possible if the gravure motif of the intaglio printing plate in the region of the substrate chamber has a depression which receives the substrate chamber during the intaglio printing step and thus protects it, as in the document WO 2008/014952 A2 whose disclosure content is included in the present application in this respect.

Instead of a recess 66 in the adhesive coating 64 may be the local lack of adhesion between substrate 50 and foil element 60 also by a non-stick coating 56 of the substrate 50 be generated as in 6 shown. In this case, the foil element is 60 preferably over the entire surface with adhesive 64 coated. The non-stick coating 56 of the substrate 50 may be formed for example by a silicone-containing color. The non-stick coating 56 can be colorless, or even colored and then a part or even the entire feature area 52 form. Additional visual non-visible features such as luminescent or infrared absorbers may also be present in the non-stick coating 56 be provided.

The process variant of 6 has the advantage that the non-stick coating 56 in the same printing step as the feature area 52 and thus can be applied to this without Passerschwankungen. The generated substrate chamber 70 is then also highly accurate to the feature area 52 gepassert.

Of course, it is also conceivable that the adhesive layer has a recess in the region of the substrate chamber and at the same time an anti-adhesive coating is provided in the region of the substrate chamber, which was applied to the substrate or the film element before the substrate chamber.

The first feature area 62 can, as in the 5 (c) , on top of the foil element 60 be arranged and thus in the finished security element on the outside of the substrate chamber 70 to come to rest. He can, however, also on the bottom of the film element 60 be arranged and then in the finished security element on the inside of the substrate chamber 70 lie. The first feature area 62 can also be partially on the top and partly on the bottom of the film element 60 be arranged, wherein the arranged on the top and bottom portions can be matched to each other.

The foil element 60 may also have a multi-layered structure, for example consist of a film and a protective lacquer layer between which the first feature area 62 is arranged.

When applying the film element 60 on the substrate 50 It makes sense to design the embossing tool for the film application in the area of the adhesive recess with a reduced embossing height, in order to avoid a mechanical connection of film and substrate in the area of the adhesive recess. Such an embossing height reduction is preferably performed rounded to avoid the formation of a superficial relief on the film.

7 shows a security element 80 according to a further embodiment of the invention. The security element 80 contains a substrate chamber 70 , in the manner described above in the security element substrate 50 was introduced. In the area of the substrate chamber 70 is the substrate 50 with a second feature area in the form of a metallic surface 84 provided with mirror character. This can be achieved, for example, by printing an aluminum-based offset printing ink.

The foil element 60 is with a first feature area in the form of a single or multicolor transparent image motif 82 Mistake. This can be achieved, for example, in offset printing, gravure printing or inkjet printing by scanning a desired image motif. Ideally, the colors used are transparent.

Due to the mirror character of the metallic surface 84 and the rasterization of the picture motif 82 becomes incident light 86 reflects and illuminates the picture motif 82 from underneath. This results in the consideration of the security element 80 the visual impression of a combination of a supervisory and a visual image. The effect is similar in effect to a backlit display. In a banknote or document of value, such backlighting acts surprisingly, so that the security element is easily perceived and remembered by the user.

The metallic surface 84 can also be structured to give a particularly clear color effect of the image 82 to achieve. Will the rasterization of the mirror surface 84 on the screening of the picture motif 82 tuned, so may when tilting the security element 80 a light / dark effect or an on / off effect for the image display can be achieved. While at a first glance, that of the rasterized mirror surface 84 reflected light from below on the raster elements of the image motif 82 falls and makes them light up brightly, the reflected light runs from a second angle on the raster elements of the image motif 82 past, leaving the picture motif 82 appears dark. Therefore, the observer can seemingly turn the display of the image motif on or off by tilting the security element.

In the embodiment of the 8th contains the security element 90 a substrate chamber made in the manner described above 70 , In the area of the substrate chamber 70 is the substrate 50 with a second feature area in the form of a luminescent area 94 provided when excited by UV radiation 96 luminescence 98 emitted in the visible spectral range.

The foil element 60 is with a first feature area in the form of a picture motif 92 provided, that for the excitation radiation 96 at least partially pervious. This can be done by rasterizing the picture motif 92 or by using UV-transmitting colors. In UV irradiation 96 of the security element 90 produces the luminescent area 94 then a backlight 98 for the picture motif 92 ,

For the picture 92 Colors can also be used when excited by the luminescent light 98 create a multicolored image. The luminescent surface 94 may also contain optical brighteners instead of UV-stimulable luminescent substances, which can be excited by daylight.

The embodiment of 9 demonstrates as a further interaction effect of the two feature areas a viewing angle-dependent image or contrast enhancement. The security element contains this 100 a substrate chamber 70 in whose area the substrate 50 with a second feature area in the form of a screened image motif 104 is provided.

Also the foil element 60 is with a rastered image 102 provided, with the two image motifs 102 . 104 contain the same screened motif in at least one subarea.

From a predetermined angle 106 then lie the grid points of the matching subregions of the image motifs 102 . 104 just above each other, so that results in the image intensification. For example, two superimposed red halftone dots of the images create a more intense red tone. From other viewing angles, the two spaced-apart image motifs do not coincide with each other due to the parallax, so that no image enhancement occurs and the matching motif is not recognizable or can only be recognized alienated.

The foil element 60 may also contain a slightly opaque or screened metallization or colored coating as the first feature area, resulting in a viewing angle-dependent contrast enhancement when viewed.

In an alternative embodiment of the security element 100 of the 9 is the foil element 60 with a picture motif 102 , in particular a rastered image motif 102 with a covering color, z. B. Blue, while the substrate 50 in the area of the substrate chamber 70 a picture motif 104 , in particular a likewise rastered picture motif 104 has, whereby the color of the picture motive 104 the color of the picture 102 different. For example, for the picture 104 one to the picture motif 102 contrasting color, e.g. B. red or yellow when using a z. B. blue picture motif 102 be used.

Are the rasterized image motifs 102 and 104 , as in 9 shown, offset from each other, the viewer can from the predetermined angle 106 due to the image motif applied with a covering color (eg blue) 102 the picture motif behind it in the direction of observation 104 not seen. The viewer therefore takes from the viewing direction 106 a blue screened image 102 true.

Changes the viewer's viewing angle from the oblique viewing angle 106 towards a viewing angle normal to the sheet element surface, then it will pick up from that perpendicular viewing direction next to the blue screened image 102 also still parts of the screened image motif designed in contrasting color 104 (eg red) true, where due to the superimposition of blue image motif 102 and red picture motif 104 the viewer perceives a purple mixed color. The exact color depends on the color tones of the motifs used 102 and 104 and the relationship of the areas of the picture motifs 102 and 104 that the viewer perceives from a particular viewing direction. Also, the picture motifs 102 and 104 no or a different offset than in 9 have shown. In any case, results for the viewer when tilting the above-explained security element with two differently colored motifs 102 and 104 an interesting color shift effect and the security against counterfeiting of the security element is further increased.

The embodiment of 10 shows a security element 110 with a substrate chamber 70 in whose area the substrate 50 with a second feature area in the form of a picture motif 114 is provided, which has at least two metameric colors. The metameric colors 116 . 118 In this case, they look completely the same for the human eye in the case of a specific type of light, for example daytime view, but have a different spectral radiation distribution. When viewed through a suitable metameric filter, the different spectral radiation distribution comes into play and the two colors 116 . 118 can be visually distinguished.

The picture motif 114 contains a first image information, which is recognizable even if the two metameric colors 116 . 118 look the same, as well as a second image information, which is formed by the metameric color pair and which is only recognizable if the metameric colors 116 . 118 can be distinguished. For example, the first image information represents a coat of arms in which the digit sequence "50" is hidden as the second image information as the denomination of a banknote.

The foil element 60 of the security element 110 is with a first feature area in Form of a partially applied metameric filter 112 for the metameric color pair 116 . 118 Mistake. When viewed from a first viewing direction A, only the first image information is recognizable, while from the second viewing direction B, the metameric filter can be seen 112 Through the second image information is recognizable.

In the embodiment of the 11 is the substrate chamber 70 a security element 120 with a foil element 60 covered, which contains as the first feature area a hologram whose metallization 122 in the form of a line grid 124 with a duty ratio of 1: 1 demetallisiert.

On the substrate 50 the second hologram is the same hologram as the foil element 60 applied, and its metallization 126 in the same grid in the form of a line grid 128 demetallized. In the embodiment of 11 are the two line grids 124 . 128 offset by half the grid rack against each other, so that the line grid 124 . 128 when viewed vertically the security element 120 just add to the complete hologram. Also other viewing directions are not completely supplemented so that a viewing angle-dependent visual impression is created.

In an alternative design, the two line grids can be arranged one above the other without offset, so that when viewed vertically only the line grid 124 of the film element 60 can be seen, and look at the two line grid 124 . 128 in an oblique view add to the complete hologram.

In the in the 1 to 11 In the embodiments shown, security elements according to the invention have generally been described which generate a security feature with a predetermined effect through the interaction of the first and second feature regions, the effect preferably having viewing angle-dependent effects. In addition to this hereinafter referred to as "dynamic information" information, the inventive security element to increase the protection against counterfeiting can also be combined with a hereinafter referred to as "static information" information that z. B. is arranged in the surrounding area of the security element on the substrate. For example, the static information in the environment of the security element may be an imprinted denomination, while the dynamic information that can be generated by the security element when tilted is the same denomination. It would also be conceivable that the dynamic information of the security element according to the invention consists in a part of the denomination specification, while the static part of the information in the immediate vicinity of the security element consists of the other supplementary part of the denomination indication. Other possibilities are conceivable, for example, the dynamic information of the security element and the static information of the environment in a context, such. B. sun and sunbeams.

The substrate chamber, which has hitherto been shown only schematically in the exemplary embodiments, can be freely designed in its outline shape and its depth profile over a wide range, as will now be described with reference to the cross sections and plan views of FIG 12 to 15 illustrated. In this case, for the sake of simplicity, only the outline of the substrate chamber itself is shown in the plan views, in the cross sections only the substrate chamber, the film element and the adhesive layer.

In addition to angular forms as already in 3 As shown, the substrate chamber may also have a rounded outline, such as a circle, an oval 130 , as in 12 (a) shown, or be formed as any freeform with rounded corners. The shape of the substrate chamber may also form a pattern, character, or code, such as the crest motif 132 of the 12 (b) ,

A substrate chamber 140 can consist of several subchambers 142 . 144 exist as in the supervision of the 13 (a) and the cross section of 13 (b) shown. The sub-chambers 142 . 144 can each contain a similar feature area or different feature areas. The freedom of design for the designer is greatly enhanced by the use of subchambers.

Since a substrate chamber can arise only in a region without adhesion between the substrate and the film element, the shape of the substrate chamber results from the embossing region and the region of the adhesive recess (design according to FIG 5 (c) ) or the non-stick layer (design according to 6 ). A substrate chamber can therefore also be arranged specifically in the boundary region of the adhesive recess of the film element or the non-stick layer of the substrate.

The substrate chamber may be formed over a large area, for example with a dimension of (8 × 15) mm ² , or with a small area, for example (3 × 5) mm ² . With reference to the 14 (a) and (b) may be for a large area substrate chamber 150 be beneficial, within the substrate chamber 150 support elements 152 provide a constant distance from the substrate 50 and foil element 60 to ensure.

As in 15 illustrated, the substrate chamber need not have a uniform depth. By the production of the substrate chamber by an embossing process can rather in the chamber different distances between the substrate 50 and foil element 60 are generated, either in the form of discrete stages, as in the substrate chamber 160 of the 15 (a) , or in the form of a continuous depth profile, as based on the substrate chamber 162 of the 15 (b) illustrated.

As a result, it is possible, for example when using microlenses in the first feature region, to selectively combine sharply enlarged and blurred or diffusely imaged image areas. Since the focus length of the microlenses changes depending on the direction of view when the security element is tilted, tilting can interactively change the sharp image area into a diffuse image area and vice versa.

The continuous depth of the 15 (b) For example, it can be combined with a second feature area in the form of a mirror surface to form a concave mirror in the substrate chamber 162 to accomplish. For example, the concave mirror can produce a real image of the first feature area that is above the film element for the viewer 60 seems to float.

In the exemplary embodiments described, the visibility or perceptibility of the security features for a human observer has always been taken as an illustration. However, it is also possible to design and use the security elements described alternatively or additionally as machine-readable security elements. In particular, the described effects can be present alternatively or additionally in the non-visible spectral range, in particular in the IR or UV range. The viewing angle dependency of the effects can be done in a machine test by a double sensor, such as a camera for vertical viewing and a camera for oblique viewing at 45 °.

It should be mentioned at this point that in the in the 1 to 15 shown embodiments may result in the formation of a substantially airtight sealed to the environment substrate chamber. Such as B. off 3 it can be seen, the substrate chamber 24 through a foil element 30 , an adhesive layer 26 and the substrate 20 completed in essence to the environment. If foil element 30 , Adhesive layer 26 and substrate 20 are substantially airtight, this can be at z. B. production technology trained pressure differences inside and outside the substrate chamber 24 to certain impairments, in particular the flatness of the film element 30 with respect to the substrate surface.

To avoid the problem with substantially hermetically sealed substrate chambers, various measures come into consideration. On the one hand, the film element can be provided with a microperforation which consists of at least one through hole through the film element which is not in the region of the adhesive layer 26 but in which the substrate chamber spanning region of the film element is arranged. A microperforation of the substrate in the region of the substrate chamber is equally suitable. The microperforation in the substrate or in the film element is advantageously mounted at a location that does not affect the operation of the film element of the security element and is structurally imperceptible to the viewer. Such microperforations can by means of perforation devices, such as. As stamping tools, laser or by means of so-called corona perforation.

As an alternative to the above-mentioned microperforation, the adhesive layer with corresponding recesses may also permit an exchange of air between the substrate chamber and the surroundings. In the simplest case one becomes for example at the in 3 shown adhesive layer 26 provide one or more recesses that the air exchange between the substrate chamber 24 and environment allow.

In addition to the above-described measures for facilitating the exchange of air between the substrate chamber and the environment, it may of course already be sufficient in certain embodiments, if the distance of the film element is kept substantially constant with respect to the substrate by one or more support elements, as for example in 14 by means of the support elements 152 is illustrated.

In addition, it is of course also possible to provide one or more support elements and at the same time to allow air exchange between the substrate chamber and the environment by one or more of the measures described above.

LIST OF REFERENCE NUMBERS

10

bill

12

security element

20

Banknote paper

22

second feature area

24

substrate chamber

26

adhesive layer

28

imprint

30

foil patch

32

first feature area

40

grid

42

information

50

Security element substrate

52

second feature area

54

coating

56

Non-stick coating

58

Substrate underside

60

film element

62

first feature area

64

adhesive layer

66

adhesive recess

68

edge

70

substrate chamber

72

Area of the substrate chamber to be generated

80

security element

82

transparent picture motif

84

metallic surface with mirror character

86

incident light

90

security element

92

motif

94

luminescent surface

96

UV radiation

98

luminescence

100

security element

102, 104

motifs

106

perspective

110

security element

112

Metameriefilter

114

motif

116, 118

metameric colors

120

security element

122

metallization

124

line screen

126

metallization

128

line screen

130

Substrate chamber in the form of an oval

132

Substrate chamber in the form of a coat of arms motif

140

substrate chamber

142, 144

subchambers

150

substrate chamber

152

support elements

160, 162

substrate chambers

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

• EP 1545902 B1 [0060]
• WO 2008/014952 A2 [0068]

Claims (29)

Security element for security papers, documents of value and the like having a substrate and a film element applied to the substrate, characterized in that the film element has a first feature area and that a substrate chamber is formed in the substrate below the first feature area of the film element, in the area of which the film element of spaced apart from the substrate and in the region of which the substrate is provided with a second feature area which cooperates with the first feature area to produce a security feature having a predetermined overall effect. Security element according to claim 1, characterized in that the film element is connected via an adhesive layer, which is recessed at least in the region of the substrate chamber, with the substrate. Security element according to claim 1 or 2, characterized in that the film element is connected via an adhesive layer to the substrate and the substrate is provided at least in the region of the substrate chamber with a non-stick coating. Security element according to at least one of claims 1 to 3, characterized in that the substrate chamber is formed with a rounded outline shape, in particular as a circle, oval or any free form with rounded corners. A security element according to at least one of claims 1 to 4, characterized in that the shape of the substrate chamber forms a pattern, character or an encoding. Security element according to at least one of claims 1 to 5, characterized in that the substrate chamber consists of a plurality of sub-chambers. Security element according to at least one of claims 1 to 6, characterized in that at least one support element is provided in the substrate chamber, which ensures a constant distance from the substrate and the film element. Security element according to at least one of claims 1 to 7, characterized in that the substrate is formed from a substantially inelastic, preferably plastically deformable material. Security element according to at least one of claims 1 to 8, characterized in that the film element is formed of an elastic, preferably non or hardly plastically deformable material. A security element according to at least one of claims 1 to 9, characterized in that the film element has a multilayer structure and the first feature region is arranged in the interior of the multilayer structure. Security element according to at least one of claims 1 to 10, characterized in that the first and second feature area are matched to each other. Security element according to at least one of claims 1 to 11, characterized in that the second feature area is formed by a printing layer or an embossed structure. Security element according to at least one of claims 1 to 12, characterized in that the first feature area is formed by a print layer, an embossed structure, a diffractive structure, a partially metallized structure or by a micro-optical structure, in particular by a microlens grid. A security element according to at least one of claims 1 to 13, characterized in that the second feature area contains a high-resolution dot or line grid and the first feature area generates, in cooperation with the second feature area, a viewing angle-dependent moiré effect, to which the first feature area preferably a high-resolution dot or line grid, a microlens grid, or holographic information. A security element according to at least one of claims 1 to 13, characterized in that the first feature region contains a transparent motif, and the second feature region contains a specular or highly reflective, in particular metallic or non-metallic surface, the backlight for incidental light for the transparent motif of the first feature area. A security element according to at least one of claims 1 to 13, characterized in that the first feature region contains a motif, and the second feature region contains a luminescent surface which provides a backlight for the motif of the first feature region when excited. Security element according to at least one of claims 1 to 13, characterized in that the first feature area and the second feature area contain the same screened motif, so that in interaction, a viewing angle dependent motif enhancement results. Security element according to at least one of claims 1 to 13, characterized in that the first feature area contains a motif with at least two metameric colors and the second feature area contains a metameric filter. Security element according to at least one of claims 1 to 18, characterized in that the film element is a film strip or a foil patch. Security element according to at least one of claims 1 to 19, characterized in that the security element forms part of a data carrier, in particular a security paper or a value document. Security element according to at least one of claims 1 to 19, characterized in that the security element for the application to or the introduction into a data carrier, in particular a security paper or a document of value is set up and designed. Method for producing a security element for security papers, value documents and the like, in which A film element is provided and provided with a first feature area, A security element substrate is provided and provided with a second feature area, - The film element is applied to the security element substrate so that in a chamber region of the first and second feature area are superimposed and there is no adhesion between the substrate and the film element, and - The substrate is embossed with the applied film element to form a substrate chamber in the region of the chamber, in the region of which the film element is spaced from the security element substrate. A method according to claim 22, characterized in that the film element is provided on its to be connected to the security element substrate underside with an adhesive layer having an adhesive recess and / or a non-stick coating at least in the region of the substrate chamber to be produced. A method according to claim 22 or 23, characterized in that the security element substrate is provided at least in the region of the substrate chamber to be produced with a non-stick coating. Method according to at least one of claims 22 to 24, characterized in that the film element is applied with the first feature area matched to the second feature area of the security element substrate. Method according to at least one of claims 22 to 25, characterized in that the substrate is embossed with the applied film element for producing the substrate chamber with an embossing machine or stitch printing as blind embossing. Data carrier, in particular value document such as banknote, identity card or the like, which is equipped with a security element according to one of claims 1 to 21 or with a security element produced according to at least one of claims 22 to 26. A method for producing a data carrier, in particular a value document such as a banknote, identity card or the like, in which a data carrier substrate is provided, and a security element according to one of claims 1 to 21 or a security element produced according to at least one of claims 22 to 26 applied to the data carrier substrate or introduced into the data carrier substrate. Method for producing a data carrier, in particular a value document such as a banknote, identity card or the like, in which A film element is provided and provided with a first feature area, A data carrier substrate is provided and provided with a second feature area, The film element is applied to the data carrier substrate in such a way that in a chamber region the first and second feature regions overlap one another and there is no adhesion between the data carrier substrate and the film element, and - The data carrier substrate is embossed with the applied film element to form in the chamber region, a substrate chamber in the region of which the film element is spaced from the data carrier substrate.

Images