WO2013139747A1

WO2013139747A1 - Security document having a perforation window, and method for the production thereof

Info

Publication number: WO2013139747A1
Application number: PCT/EP2013/055586
Authority: WO
Inventors: Edward Springmann
Original assignee: Bundesdruckerei Gmbh
Priority date: 2012-03-19
Filing date: 2013-03-18
Publication date: 2013-09-26
Also published as: EP2828093A1; DE102012204340A1; CN104203589A; EP2828093B1; CN104203589B

Abstract

The invention relates to a method for producing a security document, a method for verifying a security document, and a security document, which comprises: a document body (2) having a front side (11) and an opposite back side (12), wherein the document body (2) is produced using at least one planar, self-supporting opaque layer (5), which is integrated into the document body (2) between the front side (11) and the back side (12), and wherein at least one optically verifiable security feature (13, 14, 15) is formed in the document body (2), which security feature has different optical effects with regard to an observation through the front side (11) and an observation through the back side (12), wherein a plurality of through-holes (30) are formed in the opaque layer (5) and arranged in such a way that the at least one optically verifiable security feature (13, 14, 15) can be optically detected both in an observation through the front side (11) and in an observation through the back side (12), wherein one of the two observations is a through-view observation (35, 36) that occurs through the through-holes in the opaque layer, and the other is a direct observation (25, 26) that does not occur through the through-holes, and the at least one optically verifiable security feature (13, 14, 15) is designed in such a way that different optical effects can be detected in the direct observation (25, 26) and in the through-view observation (35, 36), the difference of said optical effects not being caused by the presence of the opaque layer (5) and/or the through-holes (30).

Description

Security document with a perforation window and method for its production

The invention relates to a security document and to a method for its production, in particular a security document having at least one security feature, which is optically verifiable and has different optical effects depending on the viewing side of the security document.

A variety of security documents are known in the art. As such, all those objects are referred to which comprise at least one security feature which makes falsification, imitation, unauthorized duplication or the like difficult or preferably impossible.

Security documents include, for example, ID documents, passports,

Identity cards, identification cards, driving licenses, vehicle registration cards,

Vehicle letters, access authorization cards, company ID cards, access cards,

Bank cards, credit cards, visas, but also against counterfeiting secured labels, tickets, banknotes, postage stamps, securities or the like. Such

Security documents embodying a value, such as postage stamps, securities or banknotes, are also referred to as value documents. A

Differentiation between value and security documents is not always clearly possible and not essential with regard to the subject of the invention. In the sense of the objects described here, value documents are always considered as

Understood security documents.

From the prior art, different security features are known, which are optically verifiable. As optically verifiable security features all such features are considered, which by a detection of the

Security feature transmitted or reflected at this reflected or remitted light are verifiable. As light here is understood all electromagnetic radiation, which may be in the visible, infrared or ultraviolet wavelength range.

For example, a group of security features exhibiting a different effect depending on the viewing side includes volume holograms, in particular reflection volume holograms, which underlie from the one viewing side when illuminated with white light under a predetermined direction of illumination make detectable at least one direction a detectable stored in the hologram image. When viewed in phantom, a different optical effect can be observed, since here the light reflected at the hologram during the reconstruction of the reflection volume hologram is "missing".

Another set of security features is formed in security documents by having a plurality of lens elements spaced apart from in

Security document stored, optically perceptible information is formed. An example of this is the so-called CLI (Changeable Laser Image) and MLI (Multiple Laser Image) features, which have a viewing angle dependence when viewed from a side where the lenses are located between the viewer and the stored information. When viewed from the other side where the information stored in the document is before the

Lens elements are arranged, this angle-dependent effect is not perceived by the viewer, since the lenses in this case, a light propagation from the information stored in the document to the viewer not

modify.

From DE 199 34 434 A1 a value and security document with perforations is known in which microchannels are arranged as additional security and authenticity proof. Embodiments are described in which microchannels are introduced at different angles with respect to a surface normal of the layers from which the security document is formed.

From WO 03/022598 A1 a recording medium is known, which has an upper layer which has on its outer side a plurality of lenticular lenses and on the back a display element which appears to be movable about at least one axis when the recording medium is tilted. The lenticular lenses extend only over a portion of the entire outside. The presentation element is a

Security element printed on an inner card layer. It is not stated how the lenticular lenses are inserted into the document body.

From DE 10 2008 008 044 A1 a cost-effective method for the production of security and / or value documents is known, which are suitable for producing flexible and tamper-proof structures with low thermal stress, wherein the Surface structure in the top and / or bottom of substrates used for the production of documents with an embossing device having at least one embossing tool each having a contact surface, using a

Embossing and embossed using ultrasound, the

Contact area is as large as or larger than the top or bottom of the substrate. Embodiments of the manufacturing method are described which impress microlenses in a document body.

DE 10 2008 031 653 A1 discloses a method and a device for introducing a security feature into a security document, wherein the security document comprises a document body having at least one thermoplastic surface layer, the method comprising the steps of: providing the security device documents body; Providing and / or creating a structured sonotrode that is or will be coupled to a sound source; Arranging the document body relative to the sonotrode; Contacting the sonotrode and the surface layer of the document body and simultaneous coupling of sound waves through the sonotrode in the value or security document, so that a

Relief structure in the surface layer is formed, wherein the sonotrode with a

Structure is provided and / or manufactured, which has a target receiving ring level and the sonotrode is structured so that from the target entry level

projecting portions and into the target intrusion plane protruding recessed regions exist, the sonotrode is moved during the sound injection by applying pressure in the document body until the target intrusion plane with a

Document body surface target level coincides and the projecting portions recessed relief structures and the recessed areas create protruding relief structures in the surface layer.

From EP 0 216 947 A1 a card-shaped data carrier with a substrate and at least one transparent cover film is known. The substrate is provided with information detectable by the cover sheet using a laser beam, the transparent cover sheet carrying a relief applied at least partially overlapping the information area prior to recording the information, which characteristic changes the information recording by virtue of its optical lens action. Depending on the irradiation direction of the laser light, the information is stored at different locations in the substrate. Likewise at a Visual inspection perceived different information as a function of a viewing angle.

From EP 0 219 012 B1 a data carrier is known, in which in an inner

Volume range information is introduced by means of a laser beam, which are visible in the form of changes in the optical properties due to an irreversible, caused by the laser beam material change. For example, card-shaped data carriers which have a lenticular grid on a surface are described. The lenticular grid can be embossed during a laminating process by incorporating a negative of the lenticular grid into a corresponding laminating plate. Likewise, a thermostable embossing die can be used, which is inserted between the transparent cover layer and the lamination plate. It is further described that the card can be produced by means of a lamination process and the lenticular screen is subsequently introduced by means of an embossing punch or embossing roller. The information is introduced via a laser beam, which introduces information through the lens grid into the card body under different directions. This makes it easy to implement tilt pictures.

In the known from the prior art method and resulting security documents in which first an optical structure, preferably an optical structure in the form of a lenticular grid, is introduced into a surface and then the information is introduced by means of a laser beam on causing irreversible material changes, In essence, only information in the form of gray values can be stored. In addition, the subsequent addition of information by re-laser irradiation to falsify the

Security document. Full color or colorful information storage is usually not possible. In the case of the method known from WO 03/022598 A1, the information can indeed be printed in color, in particular in color, but an achievable resolution for a viewing angle-dependent security feature is limited by the fact that when inserting and integrating the print information in the

Document body occurring in the lamination process shrinkage processes as well as an exact alignment of the print information within the document body and

in particular relative to the same time introduced in a lamination process microlenses is insufficiently guaranteed. The person skilled in the art is aware of other different security features which show an optical effect which depends on the viewing side. In particular diffractive and refractive structures that are located on a surface or in the interior of the

Security document can be formed, can cause such effects.

Since the issuers of security documents have the interest to create always new, as difficult to forge security features and in

To integrate security documents, there is a need to create new, cost-effective, in particular mass-produced security features and thus novel security documents, methods for their production and new

Verification process to create.

The invention is based on the idea to provide a security document, a method for its production and a verification method in which a

Security feature, which depends on the viewing side of the

Security document causes different optical effects, in one

Security document can be used, which at the same time has at least one opaque layer. For many security documents, it is desirable that a document body, which often consists of different layers of plastic

is joined together, at least one opaque layer comprises, for example, to prevent a view in at least some areas of the document. While it is basically possible to have a document from a variety of transparent

Material layers, for example, in a lamination process, and to print one of the otherwise transparent substrate layers over a large area to create an opaque background for other arranged in other layers information and / or security features. However, it has been found that large area printed substrate layers are often vulnerable to delamination, i. a separation of the document body at an originally existing layer edge represents. Therefore, it is desirable to provide the opaque layer by integrating a self-supporting, volume-opaque layer.

To be contemplative in such security documents, visually

To use verifiable security features and to be able to use in terms of the different effects that are observable from different sides, it is proposed that a perforation of a plurality of To provide openings through the opaque layer, so that a view through the opaque layer is possible. It has been found that, despite the introduction of a plurality of perforations, even in a flatly extended area

Delamination tendency of a laminated over lamination document body is almost unaffected.

In particular, therefore, a security document is proposed, which comprises: a document body having a front side and an opposite rear side, wherein the document body of the using at least one surface

extended, self-supporting opaque layer is made, which is integrated into the document body between the front and the back, and being in the

Document body is at least one optically verifiable security feature is formed, which has different optical effects with respect to a view over the front and a view on the back, wherein in the opaque layer, a plurality of openings formed and arranged so that an optical detection of the at least one optically verifiable

Security feature both in a viewing through the front and when viewed through the back is possible, one of the two considerations is a review, which is done through the openings in the opaque layer, and the other is a direct consideration, which is not by the

Breakthroughs, and that at least one optically verifiable

Security feature is designed that in the direct consideration and in the

Review examination different optical effects can be detected, whose

Difference not by the presence of the opaque layer and / or the

Breakthroughs is conditional.

Such a security document having a document body having a front side and an opposite back side can be verified by a method comprising the steps of detecting an optical effect of at least one security feature when the security feature is viewed through the front side, and detecting another optical effect when viewing the same by the backside at least one security feature, one of the two considerations being performed as a look through view, wherein the viewing of the at least one security feature is accomplished by a plurality of apertures in a planar, self-supporting, opaque layer formed in the document body is integrated, and the other of the two considerations is performed as a direct observation in which the viewing is not performed by the plurality of apertures of the opaque layer, and comparing the detected optical effect and the further detected optical effect and deriving a

Verification information.

For the production of such a security document, a method is provided comprising the steps of: inserting a plurality of apertures into an opaque self-supporting layer; Integrating the opaque layer having the plurality of apertures into a document body having a front side and an opposite rear side; Forming at least one optically verifiable security feature in the document body in such a way, wherein the at least one optically verifiable security feature is formed and arranged with respect to the plurality of openings, that an optical detection of the at least one optically verifiable security feature both in a view through the front and is possible when viewed through the back, wherein one of the two considerations is a review, which is done through the openings in the opaque layer and the other is a direct view, which does not occur through the openings, and the at least one optically verifiable security feature is formed in that this different optical effects with respect to a front view and a consideration of the

Has back of the document body and thus different optical effects can be detected in the direct view and in the review, whose

Difference not by the presence of the opaque layer and / or the

Breakthroughs is conditional.

A novel security document and a novel method for the production of a security document are provided, which permits reliable verification, as a rule, without the aid of further aids.

definitions

As a self-supporting layer is called, which can be handled without support by other substrate layers. A layer which opposes a transmission of light in a certain wavelength range almost completely is called opaque. It will be understood by those skilled in the art that the term opaque refers to each wavelength range of light that is relevant to verification of a corresponding optically verifiable security document. Can an optically verifiable

For example, to verify security feature only by using ultraviolet light, the opaque layer is of course ultraviolet

Wavelength range opaque. Is used to verify light from different

Wavelength ranges used, the opaque layer is considered to be opaque at least in the wavelength range whose light is detected during verification.

As a document body an entity is understood, which consists of different

Individual components is combined to form a whole. Preferably, the document body is assembled on plastic base of several plastic layers. Suitable plastic materials are, in particular, those which are based on a polymer material from a group comprising PC (polycarbonate, in particular biphinol A polycarbonate), PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), TPU (thermoplastic polyurethane elastomers) PE (polyethylene) , PP (polypropylene), PI (polyimide or polytransisopropene), ABS (acrylonitrile-butadiene-styrene), PVC

(Polyvinyl chloride) and copolymers of such polymers are formed. However, the document body may also comprise other materials, such as pulp based, such as paper or the like. Further, a document body may have other elements, such as

Metal foils, metal strips, exposed hologram films, but also microelectronic components such as microchips, devices or the like can be integrated.

Particularly preferred document body are designed as card-shaped documents whose areal extent at a front and an opposite

Rear is much larger than a distance between the front and the back.

As a breakthrough of a layer, a through-hole is denoted by the layer. However, the opening need not be filled with a material whose material properties differ at least from the material through which an opening is formed. As perforations in particular microholes are considered, which are formed as perforations. Preferred embodiments

Preferably, the plurality of openings is formed only in a localized area of the opaque layer.

Particularly advantageously, the openings can be introduced by means of a laser perforation in the opaque layer. For this purpose, focused laser radiation is directed onto the opaque layer, which is usually generated pulsed. The laser radiation is able to introduce sufficient energy into the opaque layer locally

Breakthroughs are formed in the film.

Preferably, the openings in the form of micro holes with diameters in the range of 0.5 μηι to 200 μηι, more preferably in the range of 10 μηι to 20 μηι prepared. A shape of a cross-sectional area of the openings can be varied within wide limits. Preference is given to circular or elliptical

Cross-sectional areas, since they can be generated without much effort by means of laser radiation of freely available lasers in the prior art, without further requiring a beam profile forming optical elements.

In a preferred embodiment, the apertures are arranged in a grid in order to achieve the highest possible transparency in the region of the majority of the introduced apertures of the opaque layer.

In a particularly preferred embodiment, a grid is used, which is created from hexagonal cells. At each grid point an opening is formed. In this way, transparencies of up to about 60% can be

Transmission without a tendency to delamination in the area of the majority of openings can be seen.

In one embodiment, those introduced into the opaque layer

Breakthroughs before or during a lamination process with a

filled with transparent or translucent material. Preferably, backfilling takes place with a plastic material made from the same base stock as the opaque layer, but having a different opacity. Becomes a

Document body, for example, made of several layers of film, which on Base are made of polycarbonate, of which the opaque layer is colored in volume, the introduced openings are filled, for example, with a transparent polycarbonate-containing material. This can be scribed, for example, in liquid form.

It is also possible to use a polycarbonate-based ink by means of a printing process, which is "sucked" into the openings due to capillary forces, provided that the ink is printed in a targeted manner over the perforations.

Other embodiments may provide that for filling a granule based on the same polymer is used, from which the opaque layer itself is formed.

Is the opaque layer made of a base material, which of the

Base material of the adjacent layers differs in the finished document body, so it is advantageous to fill the openings with a material which is similar to the base material of the adjacent layers. As a result, reliable lamination compounds are formed through the apertures.

On the whole, however, it is preferred to produce as many layers as possible, preferably all layers, of the document body on the basis of the same plastic material, since such a monolithic document body can be produced, according to which

Lamination process in terms of plastic structure no phase boundaries at the original layer boundaries of the films are visible, from which the

Document body is made. The layer boundaries can then be recognized only on the basis of insinuations, which, for example, determine the opaque property of the material layer.

The novel security feature results from the combination of a see-through window formed by the openings in the opaque layer with a

Security feature showing different, contingent effects. For example, diffractive structures can be used as security features because an observable effect is contingent-side dependent.

If, for example, a hologram is used as the security feature, then this can be inserted between the layers during the lamination process. Volume holograms are particularly preferred since, because of the high color and angle selectivity, they can also be reproduced with white light, ie light of a continuous spectrum. While from a viewing page the

Reflection hologram the information is reconstructed in reflection under a particular viewing and illumination geometry is of the opposite

Viewing direction under suitable lighting and viewing directions quasi a complementary information recognizable. The transmitted light is deprived of the light of the particular wavelength which is reflected by the hologram.

Another very suitable security feature is designed as a so-called CLI or MLI feature. This comprises an array of lens elements and spaced therefrom optically visible marks in the document body. The array of

Lens elements are preferably embossed into an outer surface of the document body. The embossing can be done for example via a preformed lamination during the lamination process.

Preferably, the lens array covers only a portion of the surface so as not to hinder the perception of other security features that may be integrated into the document body. With respect to a direction predetermined by a surface normal of the front side and the rear side of the document body, respectively, the lens array is formed above or below the plurality of openings.

A particularly preferred method for forming the lens array is a

Embossing method, in particular an ultrasonic embossing method, wherein a sonotrode with coupling of ultrasound with the surface of a film or as

Composite body prefabricated document body blank is brought into contact and this the lens structure is impressed into the surface. During insertion, the sonotrode can be pressurized in addition to the application of ultrasound.

Other methods provide for structuring the lens structures by means of a laser ablation process. The information stored in the document body can, for example, via a laser marking in an inner material or substrate layer of the

Document body are introduced. Preferably, for introducing the information, the already formed lens structures are used to direct laser light under different directions onto the lens structures and to mark information in a material layer underlying the lens structure. This layer of material may contain substances which promote absorption of laser light in this layer without appreciably restricting transparency. The marking via a carbonization then takes place, for example, only in such a layer. The other layers of the same plastic base material pass the marker light. Darkening then takes place in the focus points to which the individual lenses of the lens structure focus the incident light. Since the focus varies depending on the direction of irradiation relative to a main lens axis in the document, it is possible to store different information in the document body under different irradiation directions.

In a subsequent consideration of the stored information by the

Lens structures through can thus viewing angle dependent the

different stored information under different

Viewing directions are recorded. If the opaque layer is below the stored information viewed from the upper side, in which the lens structures are formed, different information components are to be detected in a direct viewing of the information as described above, depending on the viewing angle. However, if one sees the security feature looking through from the opposite side of the document body, one obtains a static information of the introduced via the laser marking in the document information.

A preferred security document is thus characterized in that a viewing angle dependence of the review and the direct view is different. Such an embodiment is designed such that the at least one optically verifiable security feature comprises a plurality of lens elements to which a visually perceptible information is stored at a distance in the document. This storage can take place, for example, via a laser marking, in particular a carbonization of a part of the transparent plastic. However, the visually perceptible information can also be applied to an internal, otherwise transparent substrate layer to be printed and the lens elements are aligned aligned with the printed information in the document body.

In a further development, it is provided that the lens elements are not formed on the surface of the document body, but on the inside. For this the must

Lens structure initially in a transparent film, for example by means of a

Ultrasonic embossing process to be introduced. Subsequently, the resulting surface relief structure is filled by a transparent plastic material, which in the finished document body, for example, after a lamination process in which different layers are connected to each other to the document body, a different optical refractive index of the material from which the layer is formed, in the the lens structure is first impressed. In such a

Embodiment, the lens structure, the information stored in the document as well as the through-window formed by the plurality of openings in the opaque layer can be arranged to each other such that, for example, a

Review view of the security feature is viewing angle dependent and the direct consideration of the security feature provides a static information. However, embodiments are also feasible in which the direct consideration shows an angle dependence and the reviewing shows a static information.

The invention will be explained in more detail with reference to a drawing. Hereby show:

1 shows a schematic representation of a security document with a CLI security feature and a see-through window formed over a plurality of openings in an opaque layer;

Figures 2a-2e: different views of the security document of Fig. 1;

3: a schematic representation of a security document, which is a

Reflection volume hologram as a security feature and a through window formed in an opaque layer through-window comprises; FIGS. 4-6 show various embodiments of security documents with a CLI / MLI security feature and a see-through window formed through openings in an opaque layer;

7 shows a schematic representation of a security document with a

internal lens structure for a CLI security feature and a through-window formed by a plurality of apertures in an opaque layer;

8 shows a schematic representation of a manufacturing process of a

Security document; and

9 is a schematic flow diagram of an embodiment of a

Verification process.

In Fig. 1, a security document 1 is shown schematically in perspective. This comprises a document body 2, which is made of a plurality of superimposed and interconnected originally self-supporting layers, in particular based on plastic. From a front side 1 1 to a rear side 12 of the document body 2, this is made of a transparent layer 3, one for a

Laser marking provided transparent layer 4, a flat extended opaque layer 5 and a further transparent layer 6 formed. It will be understood by those skilled in the art that security documents may be made from a different number of originally self-supporting layers. In the illustrated embodiment, the layers are similar to 3 to 6 in terms of their areal extent. The other embodiments may be different in terms of expansion.

Preferably, the layers are all based on the same plastic material, for example all made of a polycarbonate material. As a result, during a lamination process, a monolithic document body 2 can be manufactured, at which no phase transition boundaries between the material layers, which are originally made of different self-supporting layers of the same material, are recognizable. For example, become two identical transparent layers laminated on one another, the original material layer thicknesses can no longer be determined in the finished document body. Are in the individual material layers originally, for example, photosensitizers for improved

Laser marking or pigments to bring about an opaque substrate layer included, so the material layers can of course be based on this

Determine additions in the finished document body. With regard to the

Plastic structure, which is crucial for a possible delamination, however, no phase boundaries are determined in the monolithic document body.

However, other embodiments may provide that also plastic materials based on different polymers are joined together. Others too

Joining techniques such as bonding may be used singly or in combination in individual embodiments. In the document body, a contemplation-side-dependent security feature 14 is formed.

In the document body 2 of Fig. 1, a so-called CLI security feature 13 is formed. The CLI security feature 13 comprises a lens structure 15 which is embossed into the transparent layer 3 facing the front side 11. For example, the lens structure may consist of parallel cylindrical lenses. These can all be designed identically or differently with regard to their optical properties. In addition, the CLI security feature 13 comprises an optically detectable information 20, which is formed, for example, via a laser marking in the transparent layer 4 specially prepared for this purpose. The optically detectable information 20 comprises a first information component 21, which is indicated by dots, and a second information component 22, which is indicated by crosses.

The information portions 21, 22 are arranged alternately nested. For example, the first piece of information 21 stores a letter "A" and the second piece of information 22 stores, for example, the letter "B". The two pieces of information can easily by taking advantage of the lens structure 15 in the

Document body 2 are introduced by means of laser radiation, which consists of a

Direction of irradiation A 23 and an irradiation direction B 24 for the corresponding

Information shares 21, 22 is irradiated. The incident laser radiation is focused in the document depending on the direction of irradiation at different positions, so that the partial information 21, 22 are stored nested depending on the direction of irradiation at different positions.

The CLI security feature 13 can be directly verified upon viewing the front side 1 1. This means that a consideration of the

Security document 1 on the front 1 1 represents a direct view.

Depending on the viewing directions, which are referred to as direct viewing direction A 25 and direct viewing direction B 26 and coincide correspondingly with the irradiation directions 24, 25, the different information portions can be perceived. When verifying in the direct view, a viewing direction-dependent information content of the stored information 21 is thus perceived. This represents a first optical effect which

Viewing angle is dependent.

In Fig. 2a and 2b, the direct considerations on the direct viewing directions A 25 and B 26 are shown accordingly. If a distance of the cylindrical lenses is selected to be correspondingly low, the fact that the information components originally consist of strips is not perceived by a human observer.

Rather, the information components are perceived as complete graphical representations.

In the opaque layer 5, a plurality of apertures 30 is formed, which together form a see-through window 31. This see-through window 31 is arranged in the document body 2 relative to the CLI security feature 13 so that it is possible via the back 12 to detect through the see-through window 31 the stored information 20 of the CLI security feature 13. The considerations about the back side 12 passing through the see-through window 31, i. pass through the apertures 30 in the opaque layer 5 are referred to as Durchblickbetrachtungen along the review viewing directions C 35, D 36. Independent of

Viewing direction, a static information of the CLI security feature 13 is detected, which shows a superposition of the two letters "A" and "B" in diffuse lighting. However, if the document is viewed in transmitted light and illuminated with directional radiation from the direction from which the letter "A" was originally stored, ie illuminated from the direction from which the letter "A" when viewed directly through the front side 1 1 Lens structures 15 would be visible an inverse "A" is perceived as shown in Fig. 2d If the document is illuminated in transmitted light from the directional light direction, from which direct viewing would indicate the letter "B", an inverse " Fig. 2e is shown in Fig. 2c

Security document 2 for viewing directions C 35, D 36 shown on the back 12 of the security document 1 in diffused lighting.

FIG. 3 shows a further embodiment of a security document 1. The same technical features are provided in all figures with the same reference numerals. In FIG. 3, the document body 2 has a reflection volume hologram 51 as contemplation-side-dependent security feature 14. At a

Direct viewing over the front side 1 1, with suitable irradiation of white light 52 under a viewing direction, information 53 stored in the volume reflection hologram 51 in a spectral color, for example green,

perceived. In a review by the trained through the apertures 30 see-through window 31 is under a suitable

In the viewing direction, complementary information 54 is detected in which the spectral component which has contributed to the reconstruction of the hologram is removed from the light. Depending on the viewing side of the security feature 14 thus different optical effects are detected. It goes without saying

One skilled in the art that embodiments are also possible in which the

Volume reflection hologram 51 reconstructed, for example, in the review and in the direct consideration, the complementary information is perceptible.

In Fig. 4, another security document 1 is shown schematically in a sectional view. In this embodiment, which also includes a CLI security feature 13, the stored information 20 is not introduced via a laser blackening of plastic, but by printing, for example, the underside of the transparent layer 3, in which the lens structure is embossed, in front of a

Put together. This makes it possible to realize a colored CLI security feature 13. It should be noted at this point that the terms CLI and MLI, although actually created for laser-marked security features, are nowadays also used for viewing-angle-dependent security features that incorporate Lens structure and spaced therefrom stored optical information, which is not generated by a laser.

In Fig. 5 is a sectional view of a security document analogous to the

Security document shown in FIG. 1, in which the information about

Laser marking is stored in the specially prepared laser marking substrate layer 4.

In the embodiment according to FIG. 6, the opaque layer 5 with the openings 30 formed therein is arranged between the lens structure 15 and the stored optically perceptible information 20. In this embodiment, viewing through the back side 12, in which the perceived information is viewed through the see-through window 31, is considered to be a review. This shows a viewing angle dependent effect. By viewing through the front side 1 1, which is the direct view, only the stored information 20 is perceived as static information. For example, analogous to the

Embodiment of FIG. 1, a superposition of the letters "A" and "B"

while looking through the viewing direction, alternatively the letters "A" or "B" are perceived.

Shown in Figure 7 is another embodiment in which the lens structure 15 of the CLI security feature 13 is not attached to the uppermost substrate layer, i. at the

Front side of the security document 2 is formed. In this embodiment, the "free spaces" 61 created during the formation of the lenses of the lens relief in the substrate layer 4 are filled with a plastic material 62 whose refractive index deviates from that of the substrate layer 4 into which the lens relief is embossed. This substrate layer 4 is superimposed on another transparent layer 3, so that the

Front 1 1 of the document 1 is smooth and even. Preferably, the substrate layer 4, into which the lens structure 15 is originally embossed, is more highly refractive than the remaining substrate layers 3, 6 and than the plastic material 62 used to fill in the free spaces 61 created during embossing. There are, however

Embodiments are possible in which the refractive indices are chosen to be opposite. Decisive for a lens effect is merely that the layer 4, in which the structures are embossed, and the plastic material 62, which fills the free spaces 61, have a different refractive index. With regard to the the embodiment of FIG. 7 is similar to those of FIGS. 1, 4 and 5.

FIG. 8 schematically shows the production of a security document. Substrate layers 3-6 corresponding to the substrate layers 3-6 of the embodiment of FIG. 1 are provided on different rollers 101-104. At this

Embodiment, for example, prepared for a laser marking

Substrate layer 4 printed in those areas where the CLI security feature is not to be formed later. The remaining substrate layers can also be printed. For this purpose, one or more pressure devices 121 may be provided. The apertures 30 are formed in the form of microperforations in a perforation device 131, for example via the irradiation of laser light, in the opaque, extensively extended substrate layer 5. In a

Laminating device 141, the various substrate layers 3-6 are joined together to form a monolithic layer composite 152. In a lens embossing device 151 are via a sonotrode on the front side 1 1 of the layer composite

Microlenses of a lens structure 15 embossed.

In a laser marking device 161, different information 20 about the microlenses of the lens structure 15 are stored in the document body from different directions. Finally, a separating device 171 separates the security documents 1 thus produced, which in the case of the production process described by way of example are identical to those of FIG.

In the illustrated method, the openings are not filled. There a

Lamination under preferably vacuum or negative pressure takes place, this is possible. If the apertures are executed as microperforations, it has also been found that the apertures in the lamination process are at least not filled with opaque substrate material. In addition, it has been shown that the surfaces are smooth and even in the area of underlying formed

See-through window. In other embodiments, it can be provided that, for example in a doctoring station (not shown), transparent plastic material for filling in the perforations is doctored in before the lamination step. FIG. 9 is a schematic diagram of a flowchart of a verification method. First, a security document is provided 201. The at least one

Security element, which shows different optical effects depending on the viewing side, is first of all detected in a direct view 202. Subsequently, a review is provided by the image formed in the opaque layer

See-through window 203. In a comparison step 204, in the

Information from a database 207 can be included, the detected visual effects of the review and the direct viewing are compared and evaluated and derived therefrom a verification decision 205 and issued 206.

It should be understood that the verification method and method of manufacture described herein are merely simple embodiments that may be refined by additional steps.

LIST OF REFERENCE NUMBERS

1 security document

2 document bodies

3 transparent layer

4 provided for the laser marking layer

5 opaque layer

6 transparent layer

1 1 front side

12 back side

13 CLI security feature

14 view page-dependent security feature

15 lens structure

20 optically detectable information

21 first piece of information

22 second information share

23 irradiation direction A

24 irradiation direction B

25 Direct Viewing A

26 Direct Viewing B

30 openings

31 see-through window

35 Reviewing direction C

36 Viewing direction D

41 View in direct viewing direction A

42 View in direct viewing direction B

47 optical background

51 reflection hologram

52 white light

53 Information

54 complementary information

101 -104 rolls

121 printing device

131 perforation device

141 laminating device 151 Lens embossing device

152 layer composite

161 laser marking device

171 singulating device

201 -206 process steps

207 database

Claims

claims

1 . Security document (1) comprising:

a document body (2) having a front side (11) and an opposite rear side (12), wherein the document body (2) is made using at least one flat, self-supporting, opaque layer (5) inserted into the document body (2) between the front (1 1) and the back (12) is integrated,

and wherein in the document body (2) at least one optically verifiable security feature (13, 14, 51) is formed, which has different optical effects with respect to a view over the front (1 1) and a view on the back (12),

characterized in that

in the opaque layer (5) a plurality of openings (30) is formed and arranged so that an optical detection of the at least one optically verifiable security feature (13, 14, 51) both when viewed through the front (1 1) and when viewed through the backside (12), one of the two considerations being a see-through view (35, 36) passing through the apertures in the opaque layer and the other being a direct view (25, 26) which is not is performed through the openings, and the at least one optically verifiable security feature (13, 14, 51) is formed that in the direct view (25, 26) and in the

Review (35, 26) different optical effects can be detected, the difference is not due to the presence of the opaque layer (5) and / or the openings (30) is conditional.

2. Security document (1) according to claim 1, characterized in that the

at least one optically verifiable security feature (13, 14, 51) a

Viewing angle dependence for at least one of the two considerations.

3. security document (1) according to claim 1 or 2, characterized in that a viewing angle dependence of the review (24, 25) and the direct view (35, 36) is different.

4. Security document (1) according to one of the preceding claims, characterized in that the at least one optically verifiable security feature (13, 14) comprises a plurality of lens elements (15), to which spaced in the document optically perceptible information (21) are stored ,

5. Security document according to one of the preceding claims, characterized

characterized in that the at least one security feature (14) a

Volume hologram (51), in particular a volume reflection hologram comprises,

6. A method for verifying a security document (1), which has a

Document body (2) having a front side (1 1) and an opposite rear side (12), comprising the steps:

Detecting an optical effect of at least one security feature (14) when viewing the security feature (14) through the front side (11), and detecting another optical effect when viewing the same at least one security feature (14) through the back surface (12) one of the two considerations is performed as a review (35, 36), wherein the viewing of the at least one security feature by a plurality of openings (30) in a flat, self-supporting opaque layer (5) in the document body (2) is integrated, and the other of the two considerations is performed as a direct view (24, 25) in which the viewing is not performed by the plurality of apertures (30) of the opaque layer (5), and comparing the detected optical effect and the further detected optical effect and deriving a verification information.

7. A method for producing a security document (1) comprising the steps:

Introducing a plurality of apertures (30) into an opaque self-supporting layer (5);

Integrating the opaque layer (5) provided with the plurality of apertures (30) into a document body (2) having a front side (11) and an opposite rear side (12);

Forming at least one optically verifiable security feature (14) in the document body in such a way that the at least one optically verifiable security feature (14) is formed and with respect to the plurality of

Openings (30) is arranged that an optical detection of the at least one optically verifiable security feature (14) both when viewed through the front (1 1) and when viewed through the back (12) is possible, wherein one of the two considerations a

Review (35, 36), which is made through the apertures in the opaque layer, and the other is a direct view (24, 25), which does not occur through the openings (30), and the at least one optically verifiable security feature (14) is formed, that this has different optical effects with respect to a viewing on the front side (1 1) and a view on the back (12) of the document body (2) and thus in the

Direct observation (24, 25) and in the review (35, 36)

Different optical effects can be detected, the difference is not due to the presence of the opaque layer and / or the openings (30).

8. The method according to claim 7, characterized in that the openings (30) are introduced by means of a laser perforation in the opaque layer.

9. The method according to claim 7 or 8, characterized in that with the

A plurality of apertures (30) provided opaque layer (5) with other layers (3, 4, 6) is laminated to the document body (2) and filled the plurality of openings (30) before or during lamination with a transparent or translucent material becomes.

10. The method according to any one of claims 7 to 9, characterized in that the plurality of openings (30) is applied in a grid which is formed from hexagonal cells.