EP2465700A2 - Security element, method for producing same and record carrier - Google Patents

Abstract

The security element has a translucent carrier material (1) whose front side is recognized when viewed in front-side top illumination direction of first pattern (5a,5b) of carrier material. The back side is recognized when viewed in back reflected light using second pattern (6a,6b) of carrier material. The patterns are configured so that a partial overlapping structural form is provided when viewed in transmitted light by a viewer perceiving in coherent range of identical visual impression. An independent claim is included for method for manufacturing security element.

Description

The invention relates to a security element for data carriers, in particular for documents of value, identity documents and the like, with a translucent carrier material whose front has a recognizable in front front view incident light first motif and the back has a recognizable when viewed in the rear incident light second motif, said at Contemplation in the front side incident light recognizable first motif and recognizable when viewed in the rear incident light second motif when viewed in transmitted light, a third motif. The invention further relates to a data carrier with such a security element and a method for producing the security element.

To protect against counterfeiting, particularly with color copiers or other reproduction methods, data carriers such as banknotes, securities, credit cards, identity documents, passports, certificates and the like, labels, packaging or other elements for product protection are provided with security elements that are printed on both sides, translucent Have carrier material. The protection against forgery of such a security element is based on the fact that in addition to the printed images of the two sides of the carrier material visually also an image can be perceived, which results in transmitted light as a superposition of the front and back printed images (see, for example RL van Renesse, "Optical Document Security", Second Edition, Artech House Publishers, 1998, pp. 155-156 ). The visible image can not be reproduced or insufficiently reproduced by the abovementioned reproduction devices, as a result of which counterfeiting can be easily recognized.

Well-known look-through registers are often based on complementing structures. This is for example from the EP 1 886 827 B1 a printed security element known, of which a part of a transparent Material is formed, wherein the printed security element comprises a first part of an image printed on one side of the transparent material, and comprises a second, complementary part of the image, which is printed on the opposite side of the transparent material, wherein both parts aligned are printed.

From the DE 32 08 204 A1 is a printing method for securing banknotes and other documents against unauthorized imitation known in the z. B. a banknote from a translucent paper or other carrier material on the front and back with a periodic or almost periodic dot or line pattern is printed. In a variant of the method described in this document, the dot or line pattern in arbitrary sub-areas of the front and back are intentionally offset from each other, so that moire images are generated, which can be detected in transmitted light with the unaided eye and evaluated as an authenticity feature.

In addition, see-through registers can also be based on partially overlapping structures. Review tabs, which are based on partially overlapping structures, offer the designer many options for integrating with other themes. However, it proves to be disadvantageous that in the area of the overlays a partial increase in contrast occurs, which can reduce the readability of the transparency information.

The invention is therefore an object of the invention to provide a security element of the type mentioned, which avoids the disadvantages of the known generic security elements, provides an increased level of security against counterfeiting and can be checked at the same time in a simple manner on its authenticity. In addition to a disk with Such a security element and a method for producing such a security element are provided.

This object is achieved by the security element defined in the main claim. A method for producing the same and a data carrier with such a security element are defined in the independent claims. Further developments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a security element with a translucent carrier material, the front of which has a recognizable in front front light first motif with at least a first motif element and the back of a recognizable when viewed in the rear incident light second motif with at least one second motif element, wherein the first motif recognizable when viewed in the front incident light and the second motif recognizable when viewed in the rear incident light when viewed in transmitted light, a third motif, and the at least one first motif element and the at least one second motif element are designed so that this when viewed in transmitted light form a partially overlapping structure, which the viewer perceives as a coherent overall area having a substantially identical visual appearance.

The at least one first motif element and the at least one second motif element are preferably each formed by a color layer or a metallic layer.

The at least one first motif element and the at least one second motif element can, for example, each be generated by a color layer which is reduced in the area that contributes to the overlap area when viewed in transmitted light, in view of the layer thickness.

The at least one first motif element and the at least one second motif element can furthermore each be produced by a color layer, which is reduced in terms of the color intensity in the region which contributes to the overlap region when viewed in transmitted light.

The at least one first motif element and the at least one second motif element can furthermore each be produced by a color layer or metallic layer applied in a grid-like manner, which is reduced in terms of the degree of coverage in the area which contributes to the overlap area when viewed in transmitted light.

Moreover, the at least one first motif element and the at least one second motif element can each be produced by an opaque color layer, which is reduced in terms of the hiding power of the color in the region which contributes to the overlap region when viewed in transmitted light.

In particular, the security element according to the first aspect of the invention may have a first motif recognizable when viewed in front-side reflected light with a plurality of first motif elements (X1; ...; Xm-1; Xm) in a number m≥2, and one as seen in FIG Rear incident light recognizable second motif having a plurality of second motif elements (Y1; ...; Yn-1; Yn) in a number n ≥ 2, where m = n, the first motif recognizable when viewed in the front side incident light and at Viewing in the back incident light recognizable second motif when viewed in transmitted light yield a third motif, and the pair of the first and second motif element (X1, Y1) are continuously configured up to the pairs of first and second motif element (Xm-1, Yn-1) and (Xm, Yn) in each case so that the first motif element and the second motif element when viewed in Transmitted light form a partially overlapping structure that perceives the viewer as a coherent overall area with substantially identical visual impression.

The partially overlapping structures, formed from the pair of first and second motif elements (X1, Y1) continuously up to the pairs of first and second motif elements (Xm-1, Yn-1) and (Xm, Yn), can each have a first Have motif element and a second motif element, each of which is produced by a color layer, which is reduced in the region which contributes to the overlap region when viewed in transmitted light, with respect to the layer thickness.

The partially overlapping structures, formed from the pair of first and second motif elements (X1, Y1) continuously up to the pairs of first and second motif elements (Xm-1, Yn-1) and (Xm, Yn), can each have a first Have motif element and a second motif element, each of which is produced by a color layer, which is reduced in the area that contributes to the overlap area when viewed in transmitted light, with respect to the color intensity.

The partially overlapping structures formed from the pair of first and second motive elements (X1, Y1) contiguous to the first and second motive element pairs (Xm-1, Yn-1) and (Xm, Yn) may further each be one have first motif element and a second motif element, each of which is generated by a grid-like applied color layer or metallic layer, in the area when viewed in transmitted light contributes to the overlap area, is reduced in terms of the degree of coverage.

The partially overlapping structures formed by the pair of first and second motif elements (X1, Y1) continuously up to the pairs of first and second motive elements (Xm-1, Yn-1) and (Xm, Yn), respectively, may be moreover respectively a first motif element and a second motif element, each of which is produced by a covering ink layer, which is reduced in the region which contributes to the overlap region when viewed in transmitted light, with respect to the opacity of the color.

In particular, the partially overlapping structures formed by the pair of first and second motive elements (X1, Y1) continuously up to the pairs of first and second motive elements (Xm-1, Yn-1) and (Xm, Yn), combinations of include four partially overlapping structures mentioned above. By way of example, the security element according to the invention comprises both partially overlapping structures with a first motif element and a second motif element, each of which is produced by a color layer which, in the region which contributes to the overlap region when viewed in transmitted light, with respect to the layer thickness and / or with respect to reduced to the color strength, as well as partially overlapping structures with a first motif element and a second motif element, each of which is generated by a grid-like applied color layer or metallic layer, which contributes in the region which contributes when viewed in transmitted light to the overlap region with respect to the degree of coverage is reduced.

In the security element according to the first aspect of the invention, the first motif recognizable when viewed in the front side incident light and For example, the second motif recognizable when viewed in the rear incident light each represent, for example, an image motif and the third motif, which results when viewed in transmitted light, represent an alphanumeric information, or vice versa.

A second aspect of the invention relates to a data carrier comprising the security element according to the first aspect of the invention. The data carrier may in particular be a value document, e.g. a banknote, or to trade a document of identification or a label.

A third aspect of the invention relates to methods for producing a security element, comprising the steps of: providing a translucent carrier material; Providing a first motif recognizable when viewed in the front incident light by generating at least a first motif element on the front side of the translucent substrate material and providing a second motif recognizable when viewed in the rear incident light by generating at least one second motif element on the back side of the translucent substrate such that the first motif recognizable when viewed in the front incident light and the second motif recognizable when viewed in the rear incident light, when viewed in transmitted light, form a third motif, wherein the at least one first motif element and the at least one second motif element are configured in such a way that they are viewed in transmitted light form a partially overlapping structure, which the viewer perceives as a coherent overall area having a substantially identical visual appearance.

The at least one first motif element and the at least one second motif element can preferably be formed in each case by a color layer or a metallic layer.

The at least one first motif element and the at least one second motif element can be produced, for example, in each case by a color layer, which is reduced in terms of the layer thickness in the region which contributes to the overlap region when viewed in transmitted light.

In addition, the at least one first motif element and the at least one second motif element can each be produced by a color layer, which is reduced in terms of the color intensity in the region which contributes to the overlap region when viewed in transmitted light.

Furthermore, the at least one first motif element and the at least one second motif element can be produced, for example, by a color layer or metallic layer applied in a grid-like manner, which is reduced in terms of the degree of coverage in the region which contributes to the overlap region when viewed in transmitted light.

In addition, the first motif element and the second motif element can each be produced, for example, by a covering color layer which is reduced in terms of the hiding power of the color in the region which contributes to the overlapping region when viewed in transmitted light.

The first motive recognizable when viewed in the front-side reflected light can be provided by generating a plurality of first motive elements (X1; ...; Xm-1; Xm) in a number m≥2 when viewed The second motif recognizable in the rear incident light can be provided by generating a plurality of second motif elements (Y1; ...; Yn-1; Yn) in a number n ≥ 2, where m = n and the pair of first and second Motive element (X1, Y1) continuously to the pairs of first and second motif element (Xm-1, Yn-1) and (Xm, Yn) are each configured so that the first subject element and the second subject element when viewed in transmitted light form partially overlapping structure, which the viewer perceives as a coherent overall area with substantially identical visual appearance.

In particular, the partially overlapping structures formed by the pair of first and second motive elements (X1, Y1) continuously up to the pairs of first and second motive elements (Xm-1, Yn-1) and (Xm, Yn), combinations of include four partially overlapping structures mentioned above. For example, the security element according to the invention can comprise both partially overlapping structures with a first motif element and a second motif element, each of which is produced by a color layer which, in the region which contributes to the overlap region when viewed in transmitted light, with respect to the layer thickness and / or in the Reduced in terms of color intensity and / or in terms of hiding power of the color, as well as partially overlapping structures with a first motif element and a second motif element, each generated by a grid-like applied color layer or metallic layer, in the area when viewed in transmitted light contributes to the overlap area, is reduced in view of the degree of coverage.

The implementation of the method according to the third aspect of the invention is preferably carried out in such a way that both the at least one first Motiv element, as well as the at least one second motif element are generated by means of a Simandandruckwerks.

The invention will be described below with reference to preferred embodiments.

For the purposes of the present invention, a transparent region has a high light transmittance of at least 90%, ideally 100%, of the incident visible light. For a viewer, a transparent area does not produce a changed impression with respect to the color and / or intensity of the light passing through the transparent area. By contrast, a translucent area visibly reduces the intensity of the transmitted light to a viewer and typically has a light transmission of 20% to 80%. Translucent areas can spectrally uniformly reduce the intensity of the transmitted light, such as a gray filter, or have different light transmittances for different spectral areas, such as a color filter. Translucent areas typically have translucent areas which have spectrally different light transmittances and thus produce a color impression in a viewer. The light transmission depends on the layer thickness, so that by a corresponding layer thickness, the light transmission in a given spectral range can be reduced to the desired extent. An opaque area generally has a low light transmission of, for example, less than 20%, preferably less than 10% and ideally of 0%. Opaque areas reduce the intensity of transmitted light spectrally uniform, at least for one observer, so that possibly existing different light transmittances for different spectral areas are no longer perceived. Covering layers of paint produce depending on Layer thickness and degree of coverage opaque or translucent areas with a spectrally uniform light transmission for the viewer.

Furthermore, in the present case, a viewing, for example a security element, in reflected light means illumination from one side and, for example, vertical viewing of the security element from the same side. A reflection in incident light is therefore present when the front of the security element is illuminated and also viewed. To determine the visual impression of a translucent area, viewing in reflected light preferably takes place in front of a white background.

In the present case, a viewing in transmitted light is understood as an illumination of a security element from one side and a viewing of the security element from another side, in particular the opposite side. A reflection in transmitted light is thus, for example, when the back of the security element illuminated and the front of the security element is considered. The light thus shines through the security element and a viewer perceives the light passing through. In transmitted light, the resulting visual impression of the observer is generated by the light transmission of the different areas of the security element.

The term "partially overlapping structure" used herein refers to the staggered arrangement of at least one first motif element and at least one second motif element, eg two regions formed by a respective color layer or a metallic layer, on the front side and the back side, respectively Translucent support material to understand, the two motif elements when viewed in the front and in the rear reflected light not exactly abut shock-to-butt to each other, but partially overlap, creating in this way an overlap area and non-overlapping areas. The overlapping of the two motif elements, when viewed in transmitted light, results in a darker visual impression of the overlap area. The invention is based on the recognition that the visibility of the see-through information can be considerably improved by transparency registers based on partially overlapping structures, in that the disturbing contrast enhancement in the overlapping area is reduced by printing technology. This reduction can take place on the front and the back of the translucent substrate to varying degrees and be accomplished by a suitable design of the two overlapping motif elements. Overall, however, the reduction in the viewer must result in a substantially identical visual impression of the partially overlapping structure. In other words, the partially overlapping structure is perceived when viewed in transmitted light as a coherent total area with substantially identical visual appearance.

The two motif elements, which form the partially overlapping structure, or one of the two motif elements, can be conveniently produced by printing in the form of color layers, with advantage a simultaneous printing (or collective printing) is used.

The two motif elements, which form the partially overlapping structure, or one of the two motif elements, but can also be produced by means of film application. In the hot foil application, the motif element is first formed on a separate carrier film in the form of a structured (for example screened) paint or metal film and in a subsequent step applied by means of a heat sealing lacquer layer on the translucent substrate. The carrier film can then be removed. In the case of cold foil application, the respective motif is first produced on the translucent carrier material in the form of an adhesive layer. Subsequently, the adhesive layer motif is pressed against a metallized film over the entire surface, so that the metallization remains on the adhesive layer motif after detachment of the metallized film. The metal film may, for example, be based on aluminum and may in particular be provided with additional information in the form of matt or glossy effects or holographic structures. The paint film may have additional information in the form of color shift effects or additional luminescent substances.

According to a preferred embodiment, the two motif elements are in each case a full-surface color layer, wherein the reduction of the contrast enhancement in the overlapping area is effected by a suitable adaptation of the color strength of the color layers. This reduces the color intensity of the motif elements in the area of the overlap. This reduction in color intensity can take place to varying degrees on the front and back of the translucent substrate. In sum, however, the reduction must result in a substantially identical visual impression, namely a substantially identical bright-dark contrast. Such an adjustment of the color intensity can be achieved, for example, by reducing the layer thickness of the respective color layer in the overlapping area. Differences in the layer thickness of the respective color layer can be accomplished, for example, by gravure printing. Another way to adjust the color strength is to produce the respective color layer of individual, superposed sub-layers with different hue (eg by offset printing). An area with dark color strength can be produced for example by partial overprinting of a light color layer with a dark color layer.

According to a further preferred embodiment, the two motif elements are in each case a full-surface color layer, wherein the color layer is based on a covering printing ink and the reduction of the contrast enhancement in the overlapping region is effected by a suitable adaptation of the hiding power of the color layer. The opaque printing ink may be based on a mixture of a base printing ink containing eg a colored pigment and a colorless, covering printing ink, preferably opaque white (eg TiO ₂ ). The opacity of the opacifying ink is adjusted by appropriately selecting the blending ratio between the base ink and the colorless opaque ink. A reduction of the contrast enhancement in the overlapping region of the two motif elements can be achieved in that the color layers in the overlapping region have a reduced opaque white content and thus a reduced translucency. This reduction in translucency may be to varying degrees on the front and back of the translucent substrate. In sum, however, the reduction must result in a substantially identical visual impression, namely a substantially identical bright-dark contrast.

According to a further preferred embodiment, the two motif elements are in each case a raster-like applied color layer or metallic layer, wherein the reduction of the contrast enhancement in the overlapping region is adjusted by a suitable adaptation of the optically effective surface coverage and / or a suitable adaptation of the structure size of the raster. The raster elements can, for example, by Grid points, grid lines or are formed by point-like recesses. It is preferred to choose the structure size of the grid so fine that the individual grid elements are no longer visible to the naked eye. The characteristic dimensions of the raster elements, such as size and spacing, are for this purpose preferably less than 100 micrometers or less than 50, 20, 10, 5, 2 or 1 micrometer. The visual impression which the first motif element and the second motif element generate in the overlap area in the viewer in the transparency is based on a mixture between the impression produced by the raster-like applied color layer of the first motif element and the impression that the raster-like applied color layer of the second Creative element created. A reduction in the contrast enhancement in the overlapping region of the two motif elements can be achieved by reducing the optically effective surface coverage and / or the structure size of the grid of the two motif elements in the overlapping region. This reduction can take place to varying degrees on the front and back of the translucent substrate. In sum, however, the reduction must result in a substantially identical visual impression, namely a substantially identical bright-dark contrast.

It may also be expedient if the first motif recognizable in the front side incident light has a plurality of first motif elements, and the second motif recognizable in the rear side reflected light has a plurality of second motif elements, so that a plurality of partially overlapping structures is formed when viewed in transmitted light , The partially overlapping structures formed by the first and second motif elements may independently of each other on overlapping full-surface color layers, or overlapping grid-like applied color layers or metallic layers according to the aforementioned preferred embodiments.

It can also be expedient if the first motif elements and / or second motif elements have machine-readable properties at least in some areas, because such a security element has authenticity features which can be checked in a further security level in addition to the so-called "human features". Such a check may e.g. be of interest to banks and similar institutions. The first motif elements and / or second motif elements may e.g. additional feature substances, such as luminescent feature substances, IR-absorbing feature substances or feature substances with magnetic properties.

The first motif (first supervisory information) recognizable when viewed in the front incident light and the second motif (second supervisory information) recognizable when viewed in the rear incident light can, for example, each represent an image motif and the third motif (see-through information) recognizable by transmitted light can display alphanumeric information , Alternatively, the first motif (first supervisory information) recognizable when viewed in the front incident light and the second motif (second supervisory information) recognizable when viewed in the rear incident light can each represent alphanumeric information, and the third motif (see-through information) recognizable by transmitted light can represent an image motif , It is preferable that the supervisory information be different from the review information because the observer is thus caused a surprise effect. It is further preferred that the supervisory information consist of a picture motif and the review information of an alphanumeric information, because in this way there is a considerable difference in information. The alphanumeric information may be, for example, the denomination of the data carrier, for example a banknote, which has the security element. In particular, it is preferred that the supervisory information and the review information are not locally spaced too far apart to facilitate the viewer's focus. It has been shown that fonts or numbers that are formed in the form of a negative recess can be hidden particularly well in image motifs, so that an early recognition of the transparency information can be avoided.

According to a further preferred embodiment, the security element can have further layers and authenticity features, such as e.g. an additional translucent, optically variable layer.

In principle, any translucent carrier material can be used for the security element. In this case, the light transmittance must be at least so great that the first motif or the second motif can be perceived visually in the front reflected light and in the rear reflected light, and in the transmitted light the third motif formed by superposing the first and second motifs can be visually perceived , The use of an additional illumination means to improve the visibility of the transparency information by the observer is conceivable, although the thickness of the material is chosen so that a perception of the transparency information is possible even without tools.

As a translucent substrate is therefore paper, especially cotton vellum paper, preferred. Of course, paper can also be used, which partly contains polymeric material.

Furthermore, it is preferred that the carrier material is a plastic film. In the case of a transparent film, the film can thereby be made into a translucent film by the transparent plastic film is colored with an opaque material, or an opaque layer is applied in a suitable thickness on the transparent plastic film. Suitable materials for the film are, in particular, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), PP (polypropylene), PA (polyamide) and PE (polyethylene). The film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature. The tools required for exploiting these properties, such as polarization filters, are known to the person skilled in the art.

It may also be expedient if the carrier material is a multilayer composite which has at least one layer of paper or a paper-like material. Such a composite is characterized by an extremely high stability, which is for the durability of the security feature of great advantage and also increases the security against counterfeiting.

It is also conceivable, however, to use a multilayer, paper-free composite material as the carrier material. These materials can also be used to advantage in certain climatic regions of the world.

All materials used as a carrier material may have additives which serve as 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 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. Other security features can be used with advantage, provided that they do not affect or only slightly affect the viewing of the printed pattern in supervision or the information in transmitted light.

The security element according to the invention can be applied to a data carrier, such as security and value documents, such as banknotes, stocks, bonds, certificates, vouchers, bank and ID cards, passports or the like. The disk is equipped in this way with an easily recognizable even to the layman security element to increase the protection against counterfeiting. Also, the security element according to the invention can be used very advantageously in the field of product protection.

Also preferred is a data carrier which has a watermark and a security element arranged at least partially in the region of the watermark. As a result, a known authenticity feature is advantageously combined with the authenticity feature according to the invention and the counterfeit security is further increased.

The invention will be explained in more detail with reference to the following embodiment variants or examples in conjunction with the additional figures. The described individual features and embodiments described below are inventive in their own right, but are also inventive in combination. The examples illustrate preferred embodiments, to which, however, the invention should not be limited in any way.

Furthermore, the representations in the figures of better understanding are highly schematized and do not reflect the realities. In particular, the proportions shown in the figures do not correspond to the conditions present in reality and serve exclusively to improve the clarity. Furthermore, the embodiments described in the following examples are reduced to the essential core information for ease of understanding. In the practical implementation much more complex patterns or images can be used.

Figuren 1 a bis d:

ein konventionelles, auf teilweise überlappenden Strukturen beruhendes Durchsichtsregister; und

Figuren 2a bis c:

ein auf teilweise überlappenden Strukturen beruhendes Durchsichtsregister gemäß der Erfindung.

In detail, the figures show:

FIGS. 1 a to d:

a conventional transparency register based on partially overlapping structures; and

FIGS. 2a to c:

a look-through register based on partially overlapping structures according to the invention.

In Fig. 1a Figure 4 is a cross-sectional view of a conventional see-through register based on partially overlapping structures. The translucent carrier material 1 is formed by a paper layer. On the front side of the paper layer 1 there are generated by means of printing ink, first motif elements 2a and 2b, which together form a recognizable in the front view first image motif. On the backside of the paper layer 1, second motif elements 3a and 3b, which are produced by means of printing ink, are formed, which together form a second image motif recognizable in the rear view. The motif elements 2a and 3a and the motif elements 2b and 3b each form a partially overlapping structure in pairs.

In Fig. 1b the front supervisory information perceptible to the viewer is shown, namely the first image motif formed by the first motif elements 2a and 2b.

In Fig. 1c the rear supervisory information perceivable to the viewer is shown, namely the second image motif formed by the second motif elements 3a and 3b.

Fig. 1d shows the perceptual transparency information perceivable to the viewer. The viewer perceives in transmitted light (both in the front and rear transmitted light) a third motif formed by the front-side first motif elements 2a and 2b and the rear-side second motif elements 3a and 3b in combination. The unprinted areas of the paper layer 1 form the see-through information, for example a typeface or a number, which was initially hidden to the viewer in front and back elevation. However, the readability of the transparency information formed by the unprinted areas of the paper layer 1 is made more difficult by the partial increase in contrast in the overlapping areas 4a and 4b.

In Fig. 2a Fig. 3 is a cross-sectional view of a partially overlapping structure based see-through register according to one embodiment of the present invention. On the front side of the paper layer 1 there are produced by means of printing ink, first motif elements 5a and 5b, which together form a recognizable in the front view first image motif. On the back of the paper layer 1 are by means of ink generated second motif elements 6a and 6b, which together form a recognizable in the rear view second image motif. The motif elements 5a and 6a and the motif elements 5b and 6b each form a partially overlapping structure in pairs. The individual motif elements 5a, 5b, 6a and 6b are designed such that the regions 52a, 62a, 52b and 62b contributing to the overlapping regions of the partially overlapping structures are reduced in color intensity compared to the non-overlapping regions 51a, 61a, 51b and 61b are. This can be accomplished, for example, by reducing the layer thickness of the printed ink layer in areas 52a, 62a, 52b and 62b by gravure printing.

In Fig. 2b the front supervisory information perceptible to the viewer is shown, namely the first image motif formed by the first motif elements 5a and 5b. Although the front-side supervisory information has a lower color strength in the regions 52a and 52b of the first motif elements than in the regions 51a and 51b of the first motif elements. However, the readability of the supervisory information on the front is not significantly impaired.

Fig. 2c shows the perceptual transparency information perceivable to the viewer. The observer perceives in the transmitted light (both in the front and in the rear transmitted light) a very recognizable third motif, that of the front, first motif elements 5a and 5b, and the rear, second motif elements 6a and 6b in combination in the form of contiguous Overall areas 7a and 7b is formed with substantially identical visual impression. The unprinted areas of the paper layer 1 form clearly recognizable transparency information, for example a typeface or a number, which was initially hidden to the observer when viewed from the front and back. The excellent readability the see-through information formed by the unprinted areas of the paper layer 1 is given by the fact that the areas 52a, 62a, 52b and 62b contributing to the overlapping areas of the partially overlapping structures are reduced in the color intensity. A suitable reduction of the color intensity in the overlapping areas results in a similar bright-dark contrast in the transmitted light as in the non-overlapping areas.

Claims (24)

Security element with a translucent carrier material, the front side of which has a recognizable in the front incident light first motif with at least a first motif element and the back of a recognizable when viewed in the rear incident light second motif with at least one second motif element, wherein
the first motif recognizable when viewed in the front incident light and the second motif recognizable when viewed in the rear incident light, when viewed in transmitted light, yield a third motif, and
the at least one first motif element and the at least one second motif element are designed so that they form a partially overlapping structure when viewed in transmitted light, perceiving the viewer as a coherent overall area with substantially identical visual impression. The security element according to claim 1, wherein the at least one first motif element and the at least one second motif element are each a color layer or a metallic layer. A security element according to claim 1 or 2, wherein the first motif recognizable when viewed in front-side reflected light has a plurality of first motif elements (X1; ...; Xm-1; Xm) in a number m≥2 and which is recognizable when viewed in the rear incident light second motif has a plurality of second motif elements (Y1; ...; Yn-1; Yn) in a number n ≥ 2, and m = n, and
the pair of first and second motif elements (X1, Y1) is continuously configured up to the pairs of first and second motif elements (Xm-1, Yn-1) and (Xm, Yn) in each case such that the first motif element and the second Motiv element when viewed in transmitted light, a partially overlapping Structure that the viewer perceives as a coherent overall area with substantially identical visual appearance. The security element according to claim 1, wherein the at least one first motif element and the at least one second motif element are each produced by a color layer which is reduced in terms of the layer thickness in the region which, when viewed in transmitted light, contributes to the overlap region. The security element according to claim 1, wherein the at least one first motif element and the at least one second motif element are each produced by a color layer which is reduced in terms of the color intensity in the region which contributes to the overlap region when viewed in transmitted light. The security element according to one of claims 1 to 3, wherein the at least one first motif element and the at least one second motif element are each produced by a grid-like applied color layer or metallic layer, which contributes to the region of overlap when viewed in transmitted light with respect to the optically effective area coverage and / or the structure size of the grid is reduced. A security element according to any one of claims 1 to 3, wherein the at least one first motif element and the at least one second motif element are each formed by a covering color layer which in the region contributing to the overlap region when viewed in transmitted light, in view of the opacity of the color is reduced. A security element according to claim 3, wherein the partially overlapping structures formed by the pair of first and second motive elements (X1, Y1) continuously extend to the first and second motive element pairs (Xm-1, Yn-1) and (Xm, Yn ), two or more of the partially overlapping structures defined in claims 4 to 7. A security element according to one of the preceding claims, wherein the recognizable in front front view incident light first motif and recognizable when viewed in the rear incident light second motif each represents an image motif and the third motif, which results when viewed in transmitted light, represents an alphanumeric information. A security element according to any one of claims 1 to 8, wherein the recognizable when viewed in the front reflected light first motif and recognizable when viewed in the rear incident light second motif each represents an alphanumeric information and the third motif, which results when viewed in transmitted light, represents an image motif , The security element according to one of the preceding claims, wherein the at least one first motif element and / or the at least one second motif element contains additional feature substances, such as luminescence feature substances, IR-absorbing feature substances or feature substances with magnetic properties. A data carrier, comprising a security element according to one of claims 1 to 11. The data carrier according to claim 12, wherein the data carrier is a value document, in particular a banknote, an identity document or a label. Method for producing a security element, comprising the steps: Providing a translucent carrier material; Providing a first motif recognizable when viewed in the front incident light by generating at least a first motif element on the front side of the translucent substrate material and providing a second motif recognizable when viewed in the rear incident light by generating at least one second motif element on the back side of the translucent substrate such that the first motif recognizable when viewed in the front incident light and the second motif recognizable when viewed in the rear incident light, when viewed in transmitted light, form a third motif, wherein the at least one first motif element and the at least one second motif element are configured in such a way that they are viewed in transmitted light form a partially overlapping structure, which the viewer perceives as a coherent overall area having a substantially identical visual appearance. The method of claim 14, wherein the at least one first motif element and the at least one second motif element is a respective color layer or a metallic layer. A method according to claim 14 or 15, wherein the first motif recognizable when viewed in front-side reflected light is provided by generating a plurality of first motif elements (X1; ...; Xm-1; Xm) in a number m≥2, and recognizable when viewed in the back incident light second motif is provided by generating a plurality of second motif elements (Y1; ...; Yn-1; Yn) in a number n ≥ 2, where m = n and the pair of first and second motif elements (X1, Y1 ) are continuously configured as far as the pairs of first and second motif elements (Xm-1, Yn-1) and (Xm, Yn) such that the first motif element and the second motif element form a partially overlapping structure when viewed in transmitted light, which the viewer perceives as a coherent overall area with substantially identical visual appearance. Method according to one of claims 14 to 16, wherein the at least one first motif element and the at least one second motif element is respectively generated by a color layer, which is reduced in the region which contributes to the overlap region when viewed in transmitted light, with respect to the layer thickness. Method according to one of claims 14 to 16, wherein the at least one first motif element and the at least one second motif element is respectively generated by a color layer, which is reduced in the region which contributes to the overlap region when viewed in transmitted light, with respect to the color intensity. Method according to one of claims 14 to 17, wherein the at least one first motif element and the at least one second motif element is respectively generated by a grid-like applied color layer or metallic layer, which contributes to the region of overlap when viewed in transmitted light, with respect to the optically effective area coverage and / or the structure size of the grid is reduced. A method according to any one of claims 14 to 17, wherein the at least one first motif element and the at least one second motif element are each formed by a covering color layer which in the region contributing to the overlap region when viewed in transmitted light, in view of the opacity of the color is reduced. A method according to claim 16, wherein the partially overlapping structures formed of the pair of first and second motif elements (X1, Y1) continuously up to the pairs of first and second motif elements (Xm-1, Yn-1) and (Xm, Yn ), at least two of the partially overlapping structures defined in claims 17 to 20. Method according to one of claims 14 to 21, wherein the recognizable when viewed in the front reflected light first motif and recognizable when viewed in the rear incident light second motif each represents an image motif and the third motif, which results when viewed in transmitted light, represents an alphanumeric information , Method according to one of claims 14 to 21, wherein the recognizable when viewed in the front reflected light first motif and recognizable when viewed in the rear incident light second motif each represents an alphanumeric information and the third motif, which results when viewed in transmitted light, represents a picture motif , Method according to one of claims 14 to 23, wherein both the at least one first motif element, as well as the at least one second motif element are produced by means of a Simandandruckwerks.

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