Data carrier for a secure article comprising an optically variable and preferably tactile security element

Abstract

A data carrier (1) for a secure article (1000) extends along an extension direction (E) and comprises a carrier body (2), at least one lens array (3), and at least one security element (4). The lens array (3) is arranged above the security element (4) with respect to the extension direction (E) and the security element (4) is arranged within the carrier body (2). The lens array (3) and the security element (4) are configured such, that an appearance of the security element (4) changes depending on a viewing angle (α1; α2) under which the data carrier (1) is viewed. The data carrier (1) comprises at least one laser marking (5), and wherein, when seen along the extension direction (E), the laser marking (5) extends from the lens array (3) at least partially through the carrier body (2) towards the security element (4).

Description

TECHNICAL FIELD

[0001] The present invention relates to a data carrier according to claim 1, a secure article comprising or consisting of such a data carrier according to claim 14, and to a method of producing such a data carrier according to claim 15.PRIOR ART

[0002] Data carriers for secure articles such as passports generally comprise security elements such as an image of the document holder or other holder data such as a name, date of birth, etc. These security elements are often provided as a print such as an inkjet print on a surface of the data carrier. In such a case, the security element may easily be tampered by removing and replacing it by fraudulent data or by partially altering it. In order to improve a counterfeit protection, the data carrier can comprise more complex security elements such as multiple laser image (MLI) or a changeable laser image (CLI) security elements, wherein typically a lenticular lens array is provided on the data carrier surface and a laser engraving through this lens array is performed resulting in different data visible from different viewing angles. However, such security elements are susceptible to forgery as well. For instance, forgers can remove the lens array and reuse it together with a forged laser engraving or cutting the lens array along its outer contour and embedding it into the counterfeit document. The first approach relies on the fact that the security element such as the personal data in a location of the lens array is arranged deep inside the document and thus vertically separated from the lens array, and the lens array bearing no personal (document or document holder specific) characteristics. The second approach relies on the fact that such a lens array typically needs to be positioned away of other features since otherwise technical problems such as with the overlapping could arise. This second approach furthermore has the disadvantage that it is associated with a waste of space, especially in the context of card sized documents.

[0003] Another security element gaining popularity in polycarbonate documents is the transparent window, typically comprising laser engraved personalization data inside of it. This security element faces the same counterfeiting risks as the CLI / MLI, i.e. the personalization is mainly in the inner layers and separating the core layers including the window from the upper layers that carry for example a printed artwork could make the window reusable, since the windows typically have simple shapes and could be cut out from the documents to be reused in fakes.SUMMARY OF THE INVENTION

[0004] It is an object of the present invention to provide a data carrier for a secure document comprising a security element that provides an increased security against forgery.

[0005] This object is achieved with a data carrier according to claim 1. That is, a data carrier for a secure article is provided, wherein the data carrier extends along an extension direction and comprises a carrier body, at least one lens array, and at least one security element. The lens array is arranged above the security element with respect to the extension direction. The security element is arranged within the carrier body. The lens array and the security element are configured such, that an appearance of the security element changes depending on a viewing angle under which the data carrier is viewed. The data carrier comprises at least one laser marking. When seen along the extension direction, the laser marking extends from the lens array at least partially through the carrier body towards the security element.

[0006] Applying such a laser marking that extends from the lens array at least partially through the carrier body towards the security element solves the problem of the prior art, wherein the lens array itself is unpersonalized and can be separated in vertical direction, i.e. with respect to the extension direction of the data carrier, from the security element such as personal data underneath. In fact, the laser marking according to the invention in a sense links or connects the lens array with the security element, for instance with a layer comprising the security element (see also further below), making it more difficult to separate the carrier body comprising the security element and to reuse the lens array.

[0007] To this end it is conceivable that the laser marking extends at least to a same depth as the security element when seen along the extension direction. The laser marking extending to a same depth as the security element when seen along the extension direction preferably means that at least one layer of the carrier body (see further below) preferably has both, the laser marking and the security element.

[0008] Moreover, it is conceivable that the laser marking extending towards the security element and possibly at least to a same depth as the security element when seen along the extension direction is continuous or interrupted. A continuous laser marking is understood as a laser marking that extends without any interruptions from the lens array towards and possibly at least to a same depth as the security element when seen along the extension direction. As an example, the carrier body could comprise laser sensitive layers being arranged above one another with respect to the extension direction, and wherein the laser marking is generated in all of these layers and thus forms a continuous laser marking. However, it is likewise conceivable that the carrier body comprises one or more laser-sensitive layer and one or more non-laser sensitive layers, in which case no laser marking is generated in the non-laser sensitive layers but only in the laser-sensitive layers, whereby an interrupted or non-continuous laser marking is formed. For example, the carrier body can comprise two laser-sensitive layers with one layer in between that does not react to the laser beam. In this case the laser marking is formed in the two sensitive layers and extends to the depth defined by the layer arranged deeper in the carrier body.

[0009] Depending on an arrangement of the security element within the carrier body and whether or not the carrier body consists of laser-sensitive layer(s) or also comprises non-laser sensitive layer(s), the laser marking can be said to extend continuously or interruptedly and / or at least to a same depth as the security element or towards but not until a same depth as the security element. For instance, the security element could be arranged at a depth that is not greater than the depth of the laser marking if the security element is provided in the intermediate non-laser sensitive layer being arranged between one or more laser-sensitive layers. As another example, the laser marking could be extending towards but not reaching the security element.

[0010] The laser marking preferably raises above a surface of the data carrier, in particular above a surface of the carrier body, and provides a tactile marking being configured to be felt by an observer of the data carrier.

[0011] The lens array is preferably arranged so as to extend away from or into the surface of the data carrier, in particular on the surface of the carrier body. The laser marking preferably raises above a surface of the lens array and provides a tactile marking that can be felt by an observer of the data carrier. Such a tactile marking can be generated in the lens array.

[0012] With suitable laser engraving parameters it is possible to generate a security element in a so-called tactile manner such that the laser marking extends from the security element being arranged within the carrier body to a top surface of the carrier body and raises above the top surface such that it can be felt with fingertips.

[0013] In practice, there is some threshold value for laser energy received by for instance by a carrier body or layer (see further below) being a polycarbonate (PC) product, after which the material starts to 'foam' instead of just 'darken'. That is, when the laser energy exceeds the threshold value or power level for tactile marking, the material of the carrier body such as the plastic material starts to foam and also darkens. In other words, depending on the laser energy or power level, the carrier body at the region of impingement of the laser radiation is preferably configured to "only darken" (if below the threshold), and to "darken + foam" (if above the threshold). The foaming causes the material to expand in size and therefore raises up from the surface. The foaming can be seen also inside the material when crosscut of a data carrier or secure article is observed after tactile marking. The tactile effect can also be achieved for instance by engraving with 'standard' power several times on the same place, whereby the total energy received by this part of the data carrier is increased. Hence, in a sense it can be said that using high laser power marking results in a tactile effect.

[0014] The tactile marking can have any shape such as one or more letters, numbers, logos, etc. In particular, since the tactile marking can be achieved by the laser power, a shape of the marking is not limited.

[0015] The data carrier, in particular the carrier body, preferably defines a top side, and wherein the lens array is provided on the top side the data carrier, in particular on the top side of the carrier body.

[0016] In other words, the lens array is preferably provided on an outermost surface of the data carrier. To this end it is particularly preferred that the carrier body provides said top side of the data carrier or said outermost surface of the data carrier, respectively.

[0017] The laser marking preferably extends beyond the lens array and at least partially along part of the carrier body being adjacent to the lens array when seen along at least one transverse direction of the data carrier extending perpendicularly to the extension direction of the data carrier.

[0018] Extending the tactile marking across the lens array, i.e. starting from a non-lens-array area and extending it to the lens-array area and possibly again beyond on its other side (any direction is possible) address the problem of being able to cut the lens-array away from the data carrier without traces since the tactile marking, in a sense, connects or links the lens array to other parts of the data carrier.

[0019] The security element preferably comprises at least a first security-element-part and a second security-element-part. The laser marking preferably provides at least part of one of the first security-element-part or of the second security-element-part. Additionally or alternatively, the first security-element-part preferably at least partially surrounds the second security-element-part. Additionally or alternatively, the first security-element-part preferably complements the second security-element-part so as to form the security element.

[0020] That is, the security element preferably is a multi-part element that comprises two or more security-element-parts.

[0021] For the sake of simplicity, reference is made two security-element-parts, namely the first security-element-part and the second security-element part. Statements made in connection with these two security-element-parts preferably apply analogously to three or more security-element-parts and vice versa.

[0022] The laser marking preferably provides at least one of these security-element-parts. For instance, the laser marking can provide the first security-element-part or the second security-element-parts.

[0023] The at least one other security-element-part is preferably configured differently, i.e. it is preferably not a laser marking. For example, the security element may comprise at least one print, as explained in more detail below, and wherein said print preferably provides the at least one other security-element-part.

[0024] Hence, for instance, the security element can comprise a first security-element-part in the form of the laser marking and a second security-element-part in the form of the print. Of course, said assignment can be exactly the other way around, with the print being the first security-element-part and the laser marking being the second security-element-part.

[0025] However, it is likewise conceivable that the security element, for instance at least the first security-element-part and the second security-element-part, are in each case laser markings, i.e. generated by laser irradiation. If a tactile marking is present as well, it is conceivable that both the security element and the tactile marking are generated with the laser, one with laser settings that lead to tactile marking and the other with laser settings that generate markings that go only to the inside of the carrier body via the lens array and are only visible from certain angles.

[0026] In any case, different interplays between the security-element-parts are conceivable.

[0027] For instance, the first security-element-part can at least partially surround the second security-element-part. In other words, the first security-element-part can at least partially define a contour of the second security-element-part.

[0028] Additionally or alternatively, the first security-element-part can complement the second security-element-part, and wherein said complementation forms the security element.

[0029] That is, the laser marking preferably is part of the security element.

[0030] However, it is likewise conceivable that there is a single-piece security element, and wherein a change in the appearance of which corresponds to a switching on / off, e.g. being visible or invisible, exhibiting a different colour and / or a different brightness when being viewed under different viewing angles.

[0031] The security element preferably comprises at least a first security element and a second security element, wherein the first security element is separated into first sub-security-element-parts and the second security element is separated into second sub-security-element-parts. The first sub-security-element-parts and the second sub-security-element-parts are preferably interlaced with each other such, that either the first security element or the second security element is observable depending on a viewing angle under with the data carrier is viewed, whereby the appearance of the security element changes depending on the viewing angle under which the data carrier is viewed, or such, that the first security element and the second security element appear to move depending on a viewing angle under which the data carrier is viewed, whereby the appearance of the security element changes depending on the viewing angle under which the data carrier is viewed.

[0032] That is, the security element can comprise at least a first security element and a second security element. In other words, it is conceivable that the security element is constituted by at least two security elements, that are herein referred to as the first security element and the second security element.

[0033] The first security element and the second security element are preferably different from one another. For instance, and as will be explained in greater detail below, the security element as well as the first and second security elements can be at least one image and / or at least one alphanumeric character. Different security elements could be for instance different images or different alphanumeric characters or one security element being an image and the other being an alphanumeric character.

[0034] The first sub-security-element-parts and the second sub-security-element-parts can be stripes or the like of the first security element and of the second security element, respectively. For a better distinction, these stripes are sometimes called first stripes and second stripes, respectively.

[0035] These sub-security-element-parts or stripes can be interlaced and arranged with respect to the lens array such, that either the first security element or the second security element is visible for an observer of the data carrier depending on a viewing angle under with the data carrier is viewed or such, that the first security element and the second security element appear to move depending on a viewing angle under with the data carrier is viewed. In other words, the security element can be a so-called lenticular security element. Hence, the security element being configured to change an appearance depending on the viewing angle under which the data carrier is viewed can be understood as the security element comprising at least the first security element and the second security element, and wherein either the first security element or the second security element is visible for an observer or wherein the first security element and the second security element appear to move depending on the viewing angle under which the data carrier is viewed.

[0036] As will be explained in greater detail below, the lens array preferably comprises a plurality of lenses. To this end it is preferred that the first sub-security-element-parts and the second sub-security-element-parts, for instance the first stripes of the first security element and the second stripes of the second security element, are interlaced with each other such that there is a pair of stripes comprising a first stripe and a second stripe under each lens of the lens array. The lens array, in particular each lens of the lens array, is preferably configured to magnify and / or and isolate for a particular viewing angle only one of these stripes, i.e. either the first stripe or the second stripe, and consequently either the first security element or the second security element.

[0037] It should be noted that the first and second sub-security-element-parts can have other shapes than the stripes. In fact, any shapes are conceivable. It is however preferred that the first and second sub-security-element-parts are arranged in a regular arrangement. It is furthermore preferred that said arrangement corresponds to an arrangement of the lens elements of the lens array. In particular, the lens elements can be arranged according to a lens grid spacing and wherein the first and second sub-security-element-parts can be arranged according to a sub-security-element-part grid spacing, wherein the lens grid spacing and the sub-security-element-part grid spacing are preferably of a same order of magnitude and / or essentially identical or identical.

[0038] That is, the security element preferably comprises multiple images and / or alphanumeric characters that are provided, for instance printed or engraved such as laser marked onto or into a surface of the data carrier.

[0039] Hence, the security element can be a so-called multiple laser image, MLI, or a changeable laser image, CLI, or an offset printed element being configured to exhibit a changing appearance such as an image switching or movement when seen through the lens array such as for example the printing products produced and sold under the names of Dynaprint ®< , MAGIC ID ®< , or Moving print ®< as they are well-known in the art. In what follows the term Dynaprint ®< is used to refer to the entire class of possible products and effects.

[0040] In general, CLI and MLI are understood as both being laser images, wherein MLI is associated with horizontal 'lenticules' and CLI with vertical. Dynaprint ®< is generally understood as an example where the security element is not personalized but printed with offset printing to a layer below the lens array. This can use colors while lasers normally only produce dark markings.

[0041] A security element comprising or consisting of a laser marking such as the CLI or MLI has the advantage that it can easily be personalized and that no alignment with the lens array needs to be actively pursued as the alignment automatically happens when irradiating the laser radiation through the lens. That is, the security element can be generated by irradiating a laser beam to the lens array from one fixed angle per data set of the security element. Due to the focusing function of the lens array there is no registration needed between the laser and the lens array. The resulting entire security element, i.e. the entire laser marking, is visible from the direction where the laser radiation was irradiated from.

[0042] In the case of Dynaprint ®< however, it is preferred that a matching of the pitch of the lens array and the printing is achieved so that a security element is obtaining that has a clear image flip effect, or a controlled mismatch of the pitches is achieved for Moire and / or 3D effects.

[0043] Hence, the laser marking preferably provides at least part of the first security element and / or of the second security element. That is, the first sub-security-element-parts or the second sub-security-element-parts can be laser markings. However, it is likewise conceivable that the first sub-security-element-parts and the second sub-security-element-parts do not comprise any laser markings but are, for instance, in each case a print.

[0044] The security element can comprise at least the first security-element-part and the second security-element-part mentioned earlier as well as the first security element and the second security element. To this end it is particularly preferred that the first security-element-part or the second security-element-part at least partially provides the first security element or the second security element. For example, it is conceivable that the security element is a lenticular security element comprising a first security element in the form of an image and a second security element in the form of a text, both of which being a print, and wherein only one of which is visible depending on a viewing angle under which the data carrier is viewed. In addition, a first-security-element-part in the form of the laser marking can be provided that at least partially surrounds the first security element and / or the second security element. Said first security element and / or second security element provide in this case the second security-element-part.

[0045] However, it is likewise conceivable that the security element comprises either only the at least one first security-element-part and second security-element-part or only at least the first security element and the second security element.

[0046] At least part of the security element, for instance of at least one of the first security-element-part, the second security-element-part, the first security element or the second security element, preferably comprises or consists of a print, in particular an inkjet print and / or a colour print. That is, at least part of the security element can be provided by the laser marking. For instance, at least part of the first security-element-part and / or of the second security-element-part and / or of the first security element, in particular the first sub-security-element-parts, and / or the second security element, in particular the second sub-security-element-parts, can be a laser marking. Additionally or alternatively, at least part of the security element preferably is a print, for instance an inkjet print and / or a colour print. For instance, part of the first security-element-part and / or of the second security-element-part and / or of the first security element, in particular the first sub-security-element-parts, and / or the second security element, in particular the second sub-security-element-parts, is a print, in particular an inkjet print and / or a color print.

[0047] The carrier body, at least in the region of the security element, is preferably transparent. Additionally or alternatively, the carrier body preferably comprises at least one window element, and wherein the lens array and the security element are at least partially arranged in the window element.

[0048] The window element is preferably at least partially arranged, in particular embedded, in the carrier body. The window element preferably is transparent. The window element preferably comprises or consist of one or more plastics and / or polymers, in particular transparent plastics and / or polymers, as mentioned earlier. The window element preferably comprises at least one window-security-element such as embedded metallic or colored foils, watermarks, embedded threads, etc., as they are well-known in the art.

[0049] The laser marking preferably extends at least partially through the window element when seen along the extension direction of the data carrier and / or at least partially through the window element and / or beyond the window element when seen along at least one transverse direction running perpendicularly to the extension direction.

[0050] The laser marking can extend at least partially through the window element when seen along the extension direction of the data carrier. Additionally or alternatively, the laser marking can extend at least partially through the window element and / or beyond the window element when seen along at least one transverse direction running perpendicularly to the extension direction. As such, the laser marking can be seen as linking or connecting the window element to its surroundings in the data carrier. In particular, the laser marking can be a tactile marking, and wherein said tactile marking can furthermore be provided at least partially or entirely across the window element.

[0051] The laser marking is preferably provided such, that it remains visible when the data carrier is viewed under different viewing angles. Alternatively, the laser marking is preferably provided such, that it is visible when the data carrier is viewed under certain one or more viewing angles and invisible when the data carrier is viewed under certain one or more other viewing angles.

[0052] The lens array preferably comprises a plurality of lens elements. The lens elements when seen along at least one transverse direction of the data carrier running perpendicularly to the extension direction of the data carrier preferably comprise in each case a raising part that raises with respect to a plane running parallel to a surface of the data carrier, a lowering part that lowers with respect to said plane, and an intermediate part that is arranged between the raising part and the lowering part. The laser marking is preferably provided in at least part of the raising parts and / or in at least part of the lowering parts and / or in at least part of the intermediate parts.

[0053] In the event that the laser marking is provided in the intermediate parts of the lens elements, the laser marking remains visible when the data carrier is viewed under different viewing angles.

[0054] In the event that the laser marking is provided in the raising parts and / or the lowering parts, the laser marking is visible when the data carrier is viewed under certain one or more viewing angles and invisible when the data carrier is viewed under certain one or more other viewing angles. In other words, the laser marking is not always visible but only when the data carrier is viewed under certain viewing angles. That is, the laser marking can be provided at different positions in the lens elements and is observable or non-observable upon tilting the viewing angle.

[0055] The lens elements can have various shapes. For instance, the lens elements can be convex lenses or rod lenses. The convex lenses are preferably spherical, although other shapes such as aspherical shapes are likewise conceivable. The lens elements are preferably arranged in a regular array and are particularly preferred provided in a grid-like array. For instance, the lens elements can be present in a regular array such as in a regular square or hexagonal lattice arrangement. The lens elements are preferably aligned parallel to one another and are arranged next to one another. A size dimension of the lens elements is preferably in the micrometer range, i.e. the lens elements are preferably so-called microlenses. A pitch between for instance lenticular lens elements preferably is around 140 micrometer, although smaller pitches such as 100 micrometer or larger pitches such as 190 micrometer are likewise conceivable. A preferred width of the lens elements preferably is in the range of 50 micrometer to 150 micrometer such as for instance about 130 micrometer. A preferred peak-to-valley-height of the lens elements is in the range of 1 micrometer to 1000 micrometer, for instance in the range of 10 micrometer to 50 micrometer such as about 20 micrometer.

[0056] The lens array can comprise lens elements in the form of lenticular lenses. These lenses can be used to generate a variable appearance of the security element, e.g. by directing light to create different images / alphanumeric characters when viewed from varying viewing angles, to display multiple security elements, animations, movement effects. However, other types of lenses are likewise conceivable, such as decoder lenses.

[0057] The security element is preferably optically variable. Additionally or alternatively, the different appearances of the security element preferably is a different colour and / or a different brightness. Additionally or alternatively, the different appearances of the security element preferably are two or more different images and / or alphanumeric characters. Additionally or alternatively, the security element preferably has the shape of at least one image and / or of at least one alphanumeric character.

[0058] The carrier body preferably comprises or consists of one or more plastics and / or one or more polymers, preferably one or more thermoplastics and / or amorphous polymers, particularly preferably polycarbonate and / or polycarbonate blends and / or polycarbonate co-extrudates.

[0059] The carrier body preferably comprises one or more layers of a plastics and / or a polymer. Two or more layers are preferably connected to one another along the extension direction of the data carrier by means commonly known in the state of the art. For instance, if the carrier body comprises two or more layers comprising or consisting of polymers and / or plastics, these layers could be connected to one another via lamination. In this case, the carrier body preferably corresponds to a so-called card body as it is commonly known in the card industry.

[0060] The carrier body preferably comprises one or more marking material layer(s) or laser-sensitive layers that are provided within the carrier body and / or as an outermost layer of the carrier body. That is, it is preferred that a marking material layer or laser-sensitive layer is provided as a top layer of the carrier body and in particular of the data carrier. It is furthermore preferred that one or more of said marking material layer(s) are arranged within the carrier body, and wherein the laser marking extends through the entire surface layer and all of the marking material layers. Such marking is typically black and, in if generated in the outermost layer of the carrier body, constituting the tactile laser marking mentioned earlier.

[0061] However, other types of layers and / or connection means are likewise conceivable. Such other types of layers and / or connection means are preferably provided in addition to the layers of polymers and / or plastics. For instance, layers of a paper-based compound could be glued to one another. In this regard it should be noted that a typical application for paper-based compounds is a visa page or a passport booklet, and wherein said layers are preferably connected to plastic and / or polymer layers as described above.

[0062] The data carrier preferably further comprises at least one marking material being configured to interact with impinging laser radiation, and wherein the lens array corresponds to a laser marking being generated in the marking material. In the event that the data carrier comprises the lens structure being generated in the marking material, it is preferred to provide said marking material as one or more layers as well. The marking material particularly preferably corresponds to polycarbonate or another plastic that preferably comprises laser sensitive additives. Once that the marking material layer(s) is provided on and / or in the carrier body, it is preferred to generate the lens structure. In regions of impingement of the laser radiation, the marking material is preferably colour-changed around the laser sensitive additives. At this point it is noted that the card body preferably comprises at least one laser-sensitive or marking material irrespective of the lens array being such a laser marking. That is, at least one laser-sensitive or marking material should always be present in the carrier body such that the laser marking extending from the lens array towards the security element as mentioned initially is realizable. It is even conceivable that all layers of the card body are laser-sensitive and / or comprise at least one marking material such that the laser marking can extend through all layers of the carrier body at least until a depth of the security element.

[0063] Additionally or alternatively, the lens array can be a print. That is, the lens array can also be produced by applying a layer of material to the carrier body, in particular to one of its layers such as the outermost layer, by means of a printing process. Any of the plastic and / or polymer materials mentioned above can be used for producing such a lens array. To this end it is particularly preferred that the print is printed on a surface, in particular the outermost surface of the carrier body. The lens array being a print preferably corresponds to a three-dimensional profile being printed. Said lens array can be generated in different ways such as by inkjet printing, lamination, tactile laser marking or tactile printing.

[0064] Additionally or alternatively, the lens array can be an embossing. For instance, an embossing process can be carried out during the lamination of the layers of the card body by means of a lamination plate used for this purpose, which has a surface structure required for forming the lens array, or by means of ultrasonic embossing in a manufacturing process step other than lamination. As such, it is preferred that the lens array is an integral component, i.e. formed into, a surface of the carrier body such as the outermost surface.

[0065] In another aspect, a secure article comprising or consisting of at least one data carrier as described above is provided. The secure article preferably is an identity card, a passport, a credit card, a smart card, a driving licence, a data page or the like.

[0066] Any statements made with regard to the data carrier as such preferably likewise apply to the secure article comprising or consisting of the data carrier and vice versa.

[0067] In another aspect, a method of producing a data carrier for a secure article such as a passport is provided. The data carrier preferably is the data carrier as described above. The method comprises the steps of i) providing a carrier body, ii) providing at least one lens array, and iii) providing at least one security element. The lens array is arranged above the security element with respect to the extension direction. The security element is arranged within the carrier body. The lens array and the security element are configured such, that an appearance of the security element changes depending on a viewing angle under which the data carrier is viewed. The data carrier comprises at least one laser marking. When seen along the extension direction, the laser marking extends from the lens array at least partially through towards the security element.

[0068] Any statements made with regard to the data carrier as such or the secure article preferably likewise apply to the method of producing a data carrier and vice versa.

[0069] The laser marking can be produced in the lens array before and / or after and / or while the security element is generated.

[0070] The laser marking in the lens array preferably is a tactile marking that raises above the surface of the lens array and provides a tactile marking that can be felt by an observer of the data carrier.

[0071] Said laser marking, in particular tactile marking, can be generated in the lens array already during the manufacturing of the data carrier and before generating the security element e.g. in the form of at least one image and / or alphanumeric character such as some symbol or country initials with e.g. just the outer contour of the desired graphical element made as a tactile relief in the surface of the lens array. Note that the area inside the contour preferably continues to be a functional lenticular structure. Thereafter, in a so-called laser personalization step, the security element is generated, for instance by passing the laser across all the area inside of the tactile contour. This can be done with today's registration capabilities.

[0072] However, it is likewise conceivable that the lens array is generated in the manufacturing of the data carrier as it is known in the prior art, i.e. with no laser marking such as tactile marking being generated in the lens array. Instead, the laser marking such as a tactile contour graphics is introduced only thereafter while the security element is produced, for instance in the laser engraving step.BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Preferred embodiments of the invention are described in the following with reference to the drawings, which are for the purpose of illustrating the present preferred embodiments of the invention and not for the purpose of limiting the same. In the drawings, Fig. 1shows a top view of a data carrier according to the state of the art; Fig. 2ashows a top view of section A of the data carrier according to figure 1 comprising a security element and being viewed under a first viewing angle; Fig. 2bshows a top view of section A of the data carrier according to figure 1 comprising a security element and being viewed under a second viewing angle; Fig. 3shows a top view of section B of the data carrier according to figure 1 comprising another security element and being viewed under a first viewing angle; Fig. 4shows a schematical sectional view of a data carrier comprising a lens array according to the state of the art; Fig. 5ashows another schematical sectional view of a data carrier comprising a security element according to the state of the art; Fig. 5bshows a schematical sectional view of the data carrier according to figure 5a, wherein a first viewing angle and a second viewing angle are schematically indicated; Fig. 6ashows a schematical sectional top view of a data carrier comprising a security element according to the invention; Fig. 6bshows a schematical sectional view of the data carrier according to figure 6a; Fig. 7ashows a top partial view of a data carrier comprising a security element according to the invention being viewed under a first viewing angle; Fig. 7bshows a top partial view of the data carrier according to figure 7a being viewed under a second viewing angle; Fig. 8shows a top view of another data carrier comprising a security element according to the invention; Fig. 9ashows a partial top view of another data carrier comprising a security element according to the invention being viewed under a first viewing angle; Fig. 9bshows a partial top view of the data carrier according to figure 9a and being viewed under a second viewing angle; Fig. 10ashows a partial top view of another data carrier comprising a security element according to the invention being viewed under a first viewing angle; Fig. 10bshows a partial top view of the data carrier according to figure 10a and being viewed under a second viewing angle; Fig. 11ashows a partial top view of another data carrier comprising a security element according to the invention being viewed under a first viewing angle; Fig. 11bshows a partial top view of the data carrier according to figure 11a and being viewed under a second viewing angle; Fig. 12ashows a partial top view of another data carrier comprising a security element according to the invention being viewed under a first viewing angle; Fig. 12bshows a partial top view of the data carrier according to figure 12a and being viewed under a second viewing angle; Fig. 13shows a partial top view of another data carrier comprising a security element according to the invention. DESCRIPTION OF PREFERRED EMBODIMENTS

[0074] Figures 1 to 5b depict (parts of) a data carrier 1' according to the state of the art that comprises a transparent window element 12' with a security element 4' in the form of a portrait 4' (see figure 3) and a MLI security element 4' in the form of a portrait and the alphanumeric characters "1995" as they are well-known in the art. Figures 2a and 2b illustrate the different appearances of the MLI security element 4' when being viewed under different viewing angles α1, α2.

[0075] As follows from figures 4 to 5b, such data carriers 1' comprise a carrier body 2' having a lens array 3'. Depending on a viewing angle under which the data carrier 1' is viewed, the lens array 3' changes an appearance of a security element (not depicted). The different viewing angles are illustrated by the solid and dashed arrows in figure 5b.

[0076] Disadvantages associated with such security elements 4' are the fact that forgers can either split the lens array 3' from the carrier body 2' of the data carrier 1' and reuse the lens array 3' in a counterfeit data carrier, cut the MLI 4' from an authentic data carrier a1' nd place it on a counterfeited data carrier, or produce a working lens array 3' by the counterfeiter and generating a simple security element on the lens array 3', for instance.

[0077] Aspects of the data carrier 1 according to the invention are now illustrated with reference to the further figures.

[0078] That is, and as follows from figures 6a and 6b, the data carrier 1 for a secure article 1000 according to the invention extends along an extension direction E and comprises a carrier body 2, at least one lens array 3, and at least one security element 4. The lens array 3 is arranged above the security element 4 with respect to the extension direction E and the security element 4 is arranged within the carrier body 2. The lens array 3 and the security element 4 are configured such, that an appearance of the security element 4 changes depending on a viewing angle α1; α2 under which the data carrier 1 is viewed. The data carrier 1 comprises at least one laser marking 5. When seen along the extension direction E, the laser marking 5 extends from the lens array 3 at least partially through the carrier body 2 towards the security element 4. For instance, the laser marking 5 can extend at least to a same depth as the security element 4, and wherein said laser marking is continuous. However, a non-continuous or interrupted laser marking 5 is likewise conceivable. For instance, the laser marking could be generated in the carrier body in the first 100µ then not in the next 100µ and then yes again in the next 100µ.

[0079] As indicated in figure 6b, the laser marking 5 raises above a surface 6 of the data carrier 1, in particular above a surface 7 of the carrier body 2, and provides a tactile marking 8 being configured to be felt by an observer of the data carrier 1. Moreover, the lens array 3 is arranged so as to extend away from the surface 6 of the data carrier 1, in particular of the surface 7 of the carrier body 2, and raises above a surface 9 of the lens array 3 so as to provide the tactile marking 8.

[0080] As furthermore follows from these figures, the laser marking 5 extends beyond the lens array 3 and partially along part of the carrier body 2 being adjacent to the lens array 3 when seen along the transverse directions T1; T2 of the data carrier 1 extending perpendicularly to the extension direction E of the data carrier 1.

[0081] The lens array 3 comprises a plurality of lens elements 13, 13a, ..., wherein the lens elements 13, 13a, ... when seen along the transverse directions T1; T2 of the data carrier 1, comprise in each case a raising part 14, 14a, ... that raises with respect to a plane running parallel to a surface 6 of the data carrier 1, a lowering part 16, 16a, ... that lowers with respect to said plane, and an intermediate part 15, 15a, ... that is arranged between the raising part 14, 14a, ... and the lowering part 16, 16a, .... In the depicted example, the laser marking 5 is provided in part of the raising parts 14, 14a, the lowering parts 16, 16a, ... and the intermediate parts 15, 15a, ..

[0082] As follows from figures 7aff, the carrier body 2, at least in the region of the security element 4, is transparent and comprises a window element 12. The lens array 3 and the security element 4 are at least partially arranged in the window element 12.

[0083] The laser marking 5 extends at least partially through the window element 12 when seen along the extension direction E of the data carrier 1, and in certain embodiments partially through the window element 12 and beyond the window element 12 when seen along at least one transverse direction T1; T2, see for instance figures 8 to 9b.

[0084] In the depicted embodiments, the laser marking 5 is provided such, that it remains visible when the data carrier 1 is viewed under different viewing angles α1; α2, see for instance figures 9a to 12b. In fact, figures 7a and 7b depict a laser marking 5 in the form of a personalized number "1995" inside a lens array 3.

[0085] This number will remain visible on all viewing angles of the data carrier 1, i.e. no optically variable effect such as MLI effect occurs. Instead, the laser marking 5 creates an embossing type effect on the lens array 3 and prevents use of this lens array 3 for example by cutting the lens array 3 off from the data carrier 1 or separating the lens array 3 from the carrier body 2, respectively.

[0086] Figure 8 depicts a tactile laser marking 5; 8 that overlaps the security element in the form of a MLI security element 4. In particular, the tactile laser marking 5; 8 is a tactile personalization "TAYLOR 15.09.1995" that starts from a so-called mirror card surface, i.e. in a region of the carrier body 2 being outside of the lens array 3, continues over the MLI security element 4 and finishes on the mirror card surface. As such, the MLI lens array 3 is locked to this data carrier 1 and prevents tampering, for example removal of the lens array 3 from the data carrier 1.

[0087] Figures 9a and 9b similarly depict a tactile laser marking personalization 5; 8 overlapping the clear window element 12. In fact, the tactile laser personalization "TAYLOR 15.09.1995" starts from the mirror card surface, continues over the window element 12 and finishes on the mirror surface.

[0088] As follows from figure 10a to 12b, the security element 4 can comprise at least a first security-element-part 10a and a second security-element-part 10b. The laser marking 5 provides at least part of one of the first security-element-part 10a or of the second security-element-part 10b, see e.g. figures 10a and 10b, wherein the laser marking 5 provides the letters "T", "y", "r", "1" and "9" of the security element 4 in the form of "Taylor 1995". That is, the security element 4 is a combination of a tactile laser marking 5; 8 ("T", "y, "r", "1" and "9") and standard MLI personalization 4 ("a", "I", "o", "9", "5"). The tactile letters 5; 8 will remain always visible, while the rest of the letters will switch on / off completing the personalized data when the data carrier 1 is viewed under different viewing angles.

[0089] Moreover, the laser marking 5 can provide a first security-element-part 10a that at least partially surrounds the second security-element-part 10b, see e.g. figures 11a and 11b, wherein the laser marking 5 surrounds and provides a contour of the security element 4 in the form of "Taylor". That is, the security element 4 can be a combination of a tactile personalization 5; 8 (letter outline) and standard MLI personalization (letter inside area). The letter inner area appears bright when the data carrier 1 is viewed under a first viewing angle α1 and dark when viewed under a second viewing angle α2. It is also possible to freely choose the letters that are having the switch effect and the viewing angles. For example, each letter may appear and disappear in unique angle creating a rolling visual effect. The laser marking 5 can also provide a first security-element-part 10a complementing the second security-element-part 10b so as to form the security element 4, see e.g. figures 12a and 12b. That is, the laser marking 5 provides a tactile marking 8 outline text going over the lens array 3 and preventing lens tampering. Inside the lens array 3 there is the second security-element-part 10b in the form of a standard MLI personalization that is utilized to create optically variable effects.

[0090] In these figures, the security element 4 comprises at least a first security element 11a and a second security element 11b, wherein the first security element 11a is separated into first sub-security-element-parts and the second security element 11b is separated into second sub-security-element-parts. The first sub-security-element-parts and the second sub-security-element-parts are interlaced with each other such, that either the first security element 11a or the second security element 11b is observable depending on a viewing angle α1; α2 under with the data carrier 1 is viewed, whereby the appearance of the security element 4 changes depending on the viewing angle α1; α2 under which the data carrier 1 is viewed. That is, the security element 4 is an optically variable security element as becomes readily apparent from a comparison of figures 10a, 11a and 12a depicting the security element 4 under a first viewing angle α1 and figures 10b, 11b and 12b depicting the security element 4 under a second viewing angle α2. At least part of the security element 4, for instance of at least one of the first security-element-part 10a, the second security-element-part 11b, the first security element 11a or the second security element 11b, can comprise or consists of a print, in particular an inkjet print and / or a colour print. For example, figure 13 depicts a security element 4 in the form of a gecko lizard, wherein the inside of the gecko lizard is an offset print provided within the carrier body 2 of the card body 1 and the outline of the gecko is a tactile laser marking 5; 8. In particular, the security element 4 corresponds to the combination of a tactile laser marking ("gecko" outlines) with Dynaprint ®< . Viewing the data carrier 1 under different viewing angles, the area inside the tactile marking will turn white / blue.LIST OF REFERENCE SIGNS

[0091] 1data carrier 1'prior art data carrier 2carrier body 2'prior art carrier body 3lens array 3'prior art lens array 4security element 4'prior art security element 5laser marking 6surface of data carrier 7surface of carrier body 8tactile marking 9surface of lens array 10afirst security-element-part 10bsecond security-element-part 11afirst security element 11bsecond security element 12window element 12'prior art window element 13, 13a,lens element 14, 14a,raising part 15, 15a,intermediate part 16, 16a,lowering part 1000secure article 1000'prior art secure article Eextension direction T1transverse direction T2transverse direction α1first viewing angle α2second viewing angle

Claims

1. A data carrier (1) for a secure article (1000) extending along an extension direction (E) and comprising: - a carrier body (2), - at least one lens array (3), and - at least one security element (4), wherein the lens array (3) is arranged above the security element (4) with respect to the extension direction (E), wherein the security element (4) is arranged within the carrier body (2), wherein the lens array (3) and the security element (4) are configured such, that an appearance of the security element (4) changes depending on a viewing angle (α1; α2) under which the data carrier (1) is viewed, characterized in that the data carrier (1) comprises at least one laser marking (5), and wherein, when seen along the extension direction (E), the laser marking (5) extends from the lens array (3) at least partially through the carrier body (2) towards the security element (4).

2. The data carrier (1) according to claim 1, wherein the laser marking (5) raises above a surface (6) of the data carrier (1), in particular above a surface (7) of the carrier body (2), and provides a tactile marking (8) being configured to be felt by an observer of the data carrier (1).

3. The data carrier (1) according to claim 2, wherein the lens array (3) is arranged so as to extend away from or into the surface (6) of the data carrier (1), in particular the surface (7) of the carrier body (2), and wherein the laser marking (5) raises above a surface (9) of the lens array (3) and provides a tactile marking (8) that can be felt by an observer of the data carrier (1).

4. The data carrier (1) according to any one of the preceding claims, wherein the laser marking (5) extends beyond the lens array (3) and at least partially along part of the carrier body (2) being adjacent to the lens array (3) when seen along at least one transverse direction (T1; T2) of the data carrier( 1) extending perpendicularly to the extension direction (E) of the data carrier (1).

5. The data carrier (1) according to any one of the preceding claims, wherein the security element (4) comprises at least a first security-element-part (10a) and a second security-element-part (10b), and wherein at least one of: - the laser marking (5) provides at least part of one of the first security-element-part (10a) or of the second security-element-part (10b), - the first security-element-part (10a) at least partially surrounds the second security-element-part (10b), or - the first security-element-part (10a) complements the second security-element-part (10b) so as to form the security element (4).

6. The data carrier (1) according to any one of the preceding claims, wherein the security element (4) comprises at least a first security element (11a) and a second security element (11b), wherein the first security element (11a) is separated into first sub-security-element-parts and the second security element (11b) is separated into second sub-security-element-parts, and wherein the first sub-security-element-parts and the second sub-security-element-parts are interlaced with each other such, that either the first security element (11a) or the second security element (11b) is observable depending on a viewing angle (α1; α2) under with the data carrier (1) is viewed, whereby the appearance of the security element (4) changes depending on the viewing angle (α1; α2) under which the data carrier (1) is viewed, or such, that the first security element (11a) and the second security element (11b) appear to move depending on a viewing angle under which the data carrier (1) is viewed, whereby the appearance of the security element (4) changes depending on the viewing angle (α1; α2) under which the data carrier (1) is viewed.

7. The data carrier (1) according to claim 6, wherein the laser marking (5) provides at least part of the first security element (11a) and / or of the second security element (11b).

8. The data carrier (1) according to any one of the preceding claims, wherein at least part of the security element (4), for instance of at least one of the first security-element-part (10a), the second security-element-part (11b), the first security element (11a) or the second security element (11b), comprises or consists of a print, in particular an inkjet print and / or a colour print,9. The data carrier (1) according to any one of the preceding claims, wherein the carrier body (2), at least in the region of the security element (4), is transparent, and / or wherein the carrier body comprises at least one window element (12), and wherein the lens array (3) and the security element (4) are at least partially arranged in the window element (12).

10. The data carrier (1) according to claim 9, wherein the laser marking (5) extends at least partially through the window element (12) when seen along the extension direction (E) of the data carrier (1) and / or at least partially through the window element (12) and / or beyond the window element (12) when seen along at least one transverse direction (T1; T2) running perpendicularly to the extension direction (E).

11. The data carrier (1) according to any one of the preceding claims, wherein the laser marking (5) is provided such, that it remains visible when the data carrier (1) is viewed under different viewing angles (α1; α2), or wherein the laser marking (5) is provided such, that it is visible when the data carrier (1) is viewed under certain one or more viewing angles (α1; α2) and invisible when the data carrier 1 is viewed under certain one or more other viewing angles (α1; α2).

12. The data carrier (1) according to any one of the preceding claims, wherein the lens array (3) comprises a plurality of lens elements (13, 13a, ...), wherein the lens elements (13, 13a, ...) when seen along at least one transverse direction (T1; T2) of the data carrier (1) running perpendicularly to the extension direction (E) of the data carrier (1) comprise in each case a raising part (14, 14a, ...) that raises with respect to a plane running parallel to a surface (6) of the data carrier (1), a lowering part (16, 16a, ...) that lowers with respect to said plane, and an intermediate part (15, 15a, ...) that is arranged between the raising part (14, 14a, ...) and the lowering part (16, 16a, ...), and wherein the laser marking (5) is provided in at least part of the raising parts (14, 14a, ...) and / or in at least part of the lowering parts (16, 16a, ...) and / or in at least part of the intermediate parts (15, 15a, ...).

13. The data carrier (1) according to any one of the preceding claims, wherein the security element (4) is optically variable, and / or wherein the different appearance of the security element (4) is at least one of: - a different colour, - a different brightness, or - two or more different images and / or alphanumeric characters, and / or wherein the security element (4) has the shape of at least one image and / or of at least one alphanumeric character.

14. A secure article (1000) comprising or consisting of at least one data carrier (1) as claimed in any one of the preceding claims, the secure article (1000) preferably being an identity card, a passport, a credit card, a smart card, a driving licence, a data page or the like.

15. A method of producing a data carrier (1) for a secure article (1000) such as a passport, the data carrier (1) preferably being the data carrier (1) as claimed in any one of claims 1 to 13, wherein the method comprises the steps of: - Providing a carrier body (2), - Providing at least one lens array (3), and - Providing at least one security element (4), wherein the lens array (3) is arranged above the security element (4) with respect to the extension direction (E), wherein the security element (4 is arranged within the carrier body (2), wherein the lens array (3) and the security element (4) are configured such, that an appearance of the security element (4) changes depending on a viewing angle (α1; α2) under which the data carrier (1) is viewed, characterized in that the data carrier (1) comprises at least one laser marking (5), and wherein, when seen along the extension direction (E), the laser marking (5) extends from the lens array (3) at least partially through the carrier body (2) towards the security element (4).

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