DE102012007747A1 - Optically variable security element - Google Patents

Optically variable security element

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Publication number
DE102012007747A1
DE102012007747A1 DE102012007747A DE102012007747A DE102012007747A1 DE 102012007747 A1 DE102012007747 A1 DE 102012007747A1 DE 102012007747 A DE102012007747 A DE 102012007747A DE 102012007747 A DE102012007747 A DE 102012007747A DE 102012007747 A1 DE102012007747 A1 DE 102012007747A1
Authority
DE
Germany
Prior art keywords
microholes
security element
layer
characterized
recording layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE102012007747A
Other languages
German (de)
Inventor
Annett Bähr
Michael Rahm
André Gregarek
Georg Depta
Walter Dörfler
Harald Reiner
Simon Freutsmiedl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to DE102012007747A priority Critical patent/DE102012007747A1/en
Publication of DE102012007747A1 publication Critical patent/DE102012007747A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29Securities; Bank notes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/324Reliefs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/346Perforations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/405Marking
    • B42D25/43Marking by removal of material
    • B42D25/435Marking by removal of material using electromagnetic radiation, e.g. laser

Abstract

The invention relates to an optically variable security element (12) for security papers, documents of value and other data carriers with - a substantially transparent carrier (20) with opposite first and second major surfaces (22, 24), - one on the first main surface (22) of the carrier arranged arrangement of microlenses (26), - a arranged on the second main surface (24) of the carrier laser-sensitive recording layer (30), the stacked first and second sub-layers (32, 34), wherein the first sub-layer (32) between the carrier (20) and the second sublayer (34), - a plurality of microholes (40) generated in the laser - sensitive recording layer by the action of laser radiation, each of which microhole (40) is associated with a microlens (26) and when viewing the Security element is visible from a given viewing angle through the associated microlens (26), wherein the plurality of microholes includes a plurality of first and a plurality of second microholes (42, 44), the first microholes (42) being in the first sublayer (32) and not passing through the recording layer (30) and the second microholes (44 ) through the recording layer (30) having first and second sublayers (32, 34), and wherein - the diameter of the first microholes (42) is greater than the diameter of the second microholes (44).

Description

  • The invention relates to an optically variable security element for security papers, value documents and other data carriers, a method for producing such a security element, and a data carrier with such a security element.
  • Data carriers, such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers. The security elements are thereby equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • For example, ID cards such as credit cards or identity cards have long been personalized by laser engraving. In personalization by laser engraving, the optical properties of the substrate material are irreversibly changed by suitable guidance of a laser beam in the form of a desired marking. Such a laser marking makes it possible to combine the individualization of the data carriers with security elements and to integrate them more freely into the printed image than in conventional individualizations, for example in the case of known indexing methods.
  • The publication EP 0 219 012 A1 describes a badge with a partial lenticular structure. This lens structure inscribes information into the card at different angles with a laser. This information can then be detected only at this angle, so that when tilting the map, the different information appear.
  • Based on this, the present invention seeks to provide a security element of the type mentioned above with an attractive visual appearance and high security against counterfeiting.
  • This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
  • According to the invention, a generic security element comprises
    • A substantially transparent support having opposed first and second major surfaces,
    • An arrangement of microlenses arranged on the first main surface of the carrier,
    • A laser-sensitive recording layer arranged on the second main surface of the carrier and containing superimposed first and second partial layers, the first partial layer being arranged between the carrier and the second partial layer,
    • A plurality of microholes generated in the laser-sensitive recording layer by the action of laser radiation, each micro-hole being associated with a microlens and being visible through the associated microlens when viewing the security element from a given viewing angle,
    • Wherein the plurality of microholes comprises a plurality of first and a plurality of second microholes, the first microholes being in the first sublayer and not passing through the recording layer and the second microholes passing through the first and second sublayer recording layers;
    • - The diameter of the first microholes is greater than the diameter of the second microholes.
  • The diameter of the first microholes is preferably more than 10%, in particular more than 20%, and particularly preferably more than 30% larger than the diameter of the second microholes. However, the diameter of the first microholes is expediently not more than 4 times, in particular not more than 3 times, the diameter of the second microholes. Due to the magnification effect of the microlenses, even a slight difference in the hole size of the first and second microholes leads to a good contrast difference of the incident light or transmitted light effect, as explained in more detail below.
  • In expedient embodiments, the diameter of the second microholes is between 2 μm and 4 μm, and the diameter of the first microholes is between 3 μm and 8 μm. For a good contrast difference, the diameters of the first micro-holes are, for example, 0.5 μm to 4 μm larger than the diameters of the second micro-holes.
  • In advantageous embodiments, the microholes are each smaller than the associated microlenses. The area ratio of microholes and associated microlens may be below 1.0 or below 0.5, below 0.2, or even below 0.1.
  • In simple configurations, the first and second microholes are each formed substantially circular. However, it is also possible for the first and / or second microholes to be patterned, for example in geometric shapes such as squares, triangles or stars, or in the form of micro-characters such as letters, numbers or the like, in order to add an additional, hidden security feature to the security element integrate. A pattern-shaped training is especially suitable for the larger first microholes.
  • While the first microholes differ at least in size and possibly also in their shape from the second microholes, the first microholes themselves advantageously all have the same shape and size, as do the second microholes.
  • Advantageously, the first microholes form a first motif in the form of patterns, characters or a code that is recognizable when the security element is viewed from a preselected first viewing direction, and the second microholes form a second motif in the form of patterns, characters or an encoding. which can be seen in the case of transmitted light viewing of the security element from a preselected second viewing direction. The first and second motif are usually different but may be identical. The first and second viewing directions are preferably different, but may also be identical.
  • In advantageous configurations, the first and second microholes are arranged independently of each other. In other equally advantageous designs, at least a portion of the second microholes lie entirely within the first microholes. For example, more than 50%, more than 75%, or even all second microholes may be completely within the first microholes. In this way, a "motif in the subject" can be generated, in which a transmitted light motif appears within an incident light motif. For example, the security element may include a visible in incident light coat of arms, which is formed by the first microholes and in the interior of which when switching to the transmitted light observation, a logo is visible, which is formed by the second microholes. In this case, the first and second viewing directions are expediently identical.
  • The first and / or second microholes are introduced in appropriate embodiments from different directions with laser radiation through the microlens array in the recording layer. In the later consideration, the microholes are then recognizable from the respective viewing direction from which they were introduced, in reflected light or transmitted light. In this case, as already described above, the first microholes may each be recognizable from a first viewing direction and the second microholes may each be recognizable from a second, different viewing direction.
  • However, it is also possible that a group of first microholes is introduced from one direction, another group of first microholes from another direction. The first motif formed by the first microholes then shows a tilting or alternating image whose partial images are formed by the different groups of first microholes. Embodiments with more than two introduction directions or continuous changes of direction are also possible. Alternatively or additionally, the second microholes may be introduced from two or more different directions in the same way.
  • The motif parts or partial images that are visible from different viewing directions can be in a sense context and, for example, represent a sequence of images that proceeds in front of the eye of the observer when the security element is tilted, as in a flip-book. If the angle of insertion and hence the viewing angle changes continuously, the degree of transparency changes, and thus the brightness in which the motif appears when the security element tilts, changes continuously.
  • The first and second sublayers of the recording layer are advantageously formed by metal layers, for example by layers of aluminum, copper, silver, gold, chromium, nickel, tungsten, palladium or an alloy of these metals, such as an Al-Cu alloy. Advantageously, the first and second sub-layers are formed by metal layers of different colors, such as aluminum and copper. In order to ensure a particularly good visibility of the Auflichtmotivs, the second sub-layer is advantageously formed by a highly reflective metal layer having a reflectivity of 90% or more, for example by a vapor-deposited aluminum or silver layer.
  • The first and / or second sub-layer is advantageously opaque, wherein a layer is called opaque if its transmission in the visible is less than 1%, in particular less than 0.1%.
  • In advantageous embodiments, the recording layer consists of the first and second sub-layers, ie it contains no further layers.
  • However, embodiments are also conceivable in which one or more further layers are arranged between the first and the second partial layer of the recording layer. In particular, between the first and second sub-layers one or more transparent to the laser layers, for. B. dielectric layer (s) of SiO 2 (silicon dioxide), are present. Such additional layers may be used, for example, to create a particular color and / or color-shift effects, and / or serve as an adhesion-enhancing layer (s). In addition, the sub-layers as such each consist of several individual layers, which may also contain neutral layers.
  • As will be explained in detail below, the difference in diameter or area of the microholes in the same recording layer allows two distinct appearances of the security element to be coded for incident and transmitted light viewing. Briefly summarized a viewer looks at incident light viewing through the comparatively large first micro holes on the highly reflective second sub-layer, while the smaller second micro holes are not visible in particular due to their small size in incident light. Due to the high reflectivity of the second sub-layer, the first motif formed by the first micro-holes is therefore clearly visible in incident light, while the second motif remains hidden.
  • In transmitted light, sufficient light also falls through the comparatively small second microholes in order to be able to recognize the second motif formed by them, while the first motif remains hidden from the first microholes present in the first sublayer because of the opacity of the second sublayer.
  • The first microholes present in the first partial layer preferably do not extend into the second partial layer. If the first and second sub-layers lie directly above one another, however, it is harmless in practice if the holes extend slightly, ie less than 1/10 or even less than 1/20 of the layer thickness into the second sub-layer due to the production. It is only essential that the remaining layer thickness of the second partial layer has a sufficiently high reflectivity and a sufficiently high opacity.
  • In an advantageous development of the invention, the security element at the same time contains a micro-optical representation arrangement, in particular a moiré magnification arrangement, a micro-optical magnification arrangement of the moire type or a modulo magnification arrangement. The basic principle of such micro-optical representation arrangements is in the document WO 2009/000528 A1 explained, the disclosure of which is included in the present description in this regard. In this case, the security element preferably has a motif image between the carrier and the recording layer, which is subdivided into a plurality of cells, in each of which imaged areas of a predetermined background motif are arranged, wherein the microlens array forms a microlens grid which, upon viewing the motif image, forms the background motif reconstructed the imaged areas in the cells.
  • The motif image is advantageously in the form of a relief structure in an embossing lacquer layer arranged between the support and the recording layer. In this case, provision can be made in particular for the first and second partial layers to follow the relief of the embossing lacquer layer, ie to have substantially the same relief structure.
  • In one variant of the invention, the microlens array can be provided with a semitransparent cover layer and / or a cover layer present only in regions. However, it is presently preferred for the microlens array to be free of applied layers which impair or cancel out the optical effect of the microlenses.
  • The invention also includes a data carrier, in particular a value document, such as a banknote, a passport, a document, an identification card or the like, which is equipped with a security element of the type described. The security element may be arranged in an advantageous variant of the invention, in particular in or over a window area or a through opening of the data carrier.
  • The invention further includes a method for producing an optically variable security element for security papers, value documents and other data carriers, in which
    • Providing a substantially transparent support with opposing first and second major surfaces, wherein an array of microlenses is disposed on the first major surface of the support,
    • A laser-sensitive recording layer is arranged on the second main surface of the carrier, the first and second sub-layers being arranged one above the other, the first sub-layer being arranged between the carrier and the second partial layer,
    • In the laser-sensitive recording layer, a multiplicity of micro-holes are produced by the action of laser radiation, each micro-hole being associated with a microlens and being visible from a specific viewing angle through the associated microlens when the security element is viewed,
    • Wherein the plurality of microholes comprises a plurality of first and a plurality of second microholes, the first microholes in of the first sub-layer and not being continuously generated by the recording layer, and the second micro-holes being formed through the recording layer having first and second sub-layers, and wherein
    • - The first micro holes are made with a larger diameter than the second micro holes.
  • In an advantageous development of the method, the first and / or second microholes are introduced from different directions with laser radiation through the microlens array into the recording layer.
  • In an advantageous variant of the method, only the first part-layer of the laser-sensitive recording layer is initially produced on the second main surface of the support in a first step and provided with the multiplicity of first microholes by the action of laser radiation. In a second step, the second sublayer of the laser-sensitive recording layer is then placed on the first sublayer and the second microholes are created through the first and second sublayer recording layers.
  • Contains another optically variable security element for security papers, value documents and other data carriers
    • A substantially transparent support having opposed first and second major surfaces,
    • An arrangement of microlenses arranged on the first main surface of the carrier,
    • A laser-sensitive recording layer arranged on the second main surface of the carrier, in particular a metal layer,
    • A printing layer arranged on the recording layer, in particular a color layer,
    • A plurality of micro-holes produced in the laser-sensitive recording layer by the action of laser radiation, each micro-hole being associated with a microlens and being visible from a given viewing angle through the associated microlens when the security element is viewed, each micro-hole being smaller than the associated microlens;
    • At least one gap region generated in the recording layer by the action of laser radiation, the dimension of which is greater than the dimension of the microlenses,
    • - Wherein the at least one gap region forms a first motif in the form of patterns, characters or a coding, which is recognizable in incident light observation and transmitted light observation of the security element with the appearance of the print layer, and
    • - Wherein the microholes form a second motif in the form of patterns, characters or a coding, which is recognizable only by transmitted light observation of the security element from a preselected viewing direction and complements from this viewing direction with the first motif to form an overall motif.
  • The at least one gap region forms a macroscopic motif visible to the naked eye, in particular without magnification by the microlenses. Its smallest dimensions are usually above 0.5 mm, typically at a few millimeters. The material of the print layer may but need not penetrate into the microholes and / or the gap areas. Preferably, the microlens array is free of deposited layers that affect or cancel the optical effect of the microlenses. The recording layer may be, for example, a 50 nm thick aluminum layer, for example, the printing layer is an imprinted solvent-based red lacquer layer. The security element can be applied to a data carrier with a certain transparency in transmitted light, such as banknote paper. In advantageous embodiments, the security element is arranged in or above a window area or a through opening of a data carrier.
  • Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.
  • Show it:
  • 1 a schematic representation of a banknote with an optically variable security element according to the invention, which is arranged over a through opening of the banknote,
  • 2 schematically the layer structure of a security element according to the invention in cross-section,
  • 3 in (a) and (b) two intermediate steps in the production of the security element of 2 .
  • 4 the visual appearance of the security element of the 2 when viewed from the front, wherein (a) and (b) of the appearance of two viewing directions in incident light, and (c) and (d) show the appearance of two viewing directions in transmitted light, and
  • 5 the visual appearance of the security element of the 2 when viewed from the Rear side, in (a) in incident light and in (b) in transmitted light.
  • The invention will now be explained using the example of security elements for banknotes. 1 shows a schematic representation of a banknote 10 with an optically variable security element according to the invention 12 that over a continuous opening 14 the banknote 10 is arranged. The security element 12 appears semitransparent in partial regions in the transmitted light direction-dependent and can be due to its application over the opening 14 From its front side as well as from its back, both in reflected light and in transmitted light are considered.
  • The security element 12 shows from these different viewing directions each different visual appearances, which leads to a high attention and recognition value.
  • 2 schematically shows the layer structure of the security element according to the invention 12 in cross-section, wherein only the parts of the layer structure required for the explanation of the functional principle are shown.
  • The security element 12 contains a substantially transparent carrier 20 which is typically formed by a transparent plastic film, such as an approximately 20 micron thick polyethylene terephthalate (PET) film. The carrier 20 has opposing first and second major surfaces, the first major surface 22 with an array of microlenses 26 is provided. In the embodiment shown, the microlenses 26 arranged regularly in the form of a microlens grid and form on the surface of the carrier film, a two-dimensional Bravais grid with a preselected symmetry. The Bravais grid of microlenses 26 For example, it may have hexagonal lattice symmetry or lower symmetry, such as the symmetry of a parallelogram lattice.
  • The spherically or aspherically designed microlenses 26 Preferably, in the exemplary embodiment have a diameter between 15 microns and 30 microns and are therefore not visible to the naked eye. The thickness of the carrier 20 and the curvature of the microlenses 26 are coordinated so that the focal length of the microlenses 26 essentially the thickness of the carrier 20 equivalent.
  • On the second main surface 24 of the carrier 20 is a laser-sensitive recording layer 30 arranged, which consists of two superposed sub-layers, wherein the first sub-layer 32 between the carrier 20 and the second sub-layer 34 is arranged. Preferably, the first and second sub-layers 32 . 34 formed of metal layers of different colors and the second sub-layer has a particularly high reflectivity of 90% or more. In the exemplary embodiment shown, this is the first partial layer 32 through a 100 nm thick copper layer and the second sub-layer 34 formed by a 50 nm thick aluminum layer, successively on the support 20 were evaporated.
  • Next was in the recording layer 30 by the action of laser radiation, a plurality of circular microholes 40 brought in. Part of the microholes (hereafter the first microholes 42 called) lies only in the first sub-layer 32 and does not go through the recording layer 30 by. Another part of the microholes (hereafter second microholes 44 called) passes through the recording layer 30 with the first and second sub-layers 32 . 34 therethrough.
  • The multitude of first micro holes 42 together form a first motif 46 , in the exemplary embodiment, the logo "G + D", which is recognizable from a preselected first viewing direction when viewing the security element from the incident light ( 4 (b) ). The multitude of second microholes 44 together forms a second motif 48 , in the exemplary embodiment, the letter pair "PL", which is recognizable in a preselected second viewing direction when the security element is viewed through transmitted light ( 5 (b) ).
  • The first microholes 42 have a diameter of 6 microns, the second microholes a diameter of only 4 microns. The diameter of the first microholes 42 is therefore (6 μm / 4 μm) = 1.5 times the diameter of the second microholes 44 , The area of the first microholes 42 is correspondingly (6 μm / 4 μm) 2 = 2.25 times the area of the second microholes 44 , As a result, on the one hand, it is achieved that in reflected light only the first motif 46 but not the second motive 48 is visible. On the other hand, through the big first microholes 42 connected to the high reflectivity of the second sub-layer 34 ensures a bright appearance of the first subject.
  • The visibility of the first and second motifs only from certain preselected viewing directions is a direct consequence of the generation of the microholes by the microlenses 26 therethrough. Regarding 3 is used to make the security element 12 on the second major surface of the carrier 20 first a 100 nm thick copper layer 32 and to this a 50 nm thick aluminum layer 34 applied, preferably in a vacuum vapor process. At these layer thicknesses are both the copper layer 32 as well as the aluminum layer 34 opaque. The thick aluminum layer 34 also has a particularly high reflectivity of more than 90%.
  • The coated support is then removed from the side of the microlenses 26 forth from the desired later viewing direction 50 the second motif with laser radiation, for example, with the radiation of a Nd: YAG, Nd: YVO 4 - or fiber laser acted upon. The microlenses 26 focus the laser radiation on the recording layer 30 , as in 3 (a) by the reference numeral 52 indicated. The laser energy or laser power is chosen so that both the first sub-layer 32 as well as the second sub-layer 34 is removed, so that through the recording layer continuous, circular second microholes 44 arise with a diameter of 2 to 4 microns. The laser beam moves the surface of the second motif 48 off, leaving the entirety of the second microholes 44 the second motive 48 forms.
  • Then, the coated support again becomes from the side of the microlenses 26 forth from the desired later viewing direction 54 of the first subject exposed to laser radiation. The microlenses 26 focus the laser radiation on the recording layer 30 , as in 3 (b) by the reference numeral 56 indicated. For laser energy or laser power is chosen in this step, that is essentially only the first sub-layer 32 but not the second sub-layer 34 is removed. To the larger area of the first microholes 42 For example, the irradiation direction of the small amplitude laser may be circular about the desired viewing direction 54 be tilted. In this way, circular first microholes having a diameter of 3 to 8 μm are produced. The laser beam also moves the surface of the first subject 46 off, leaving the entirety of the first microholes 42 the first motive 46 forms.
  • By doing this, it is achieved that each of the microholes 42 . 44 a microlens 26 is assigned, through which the micro hole 42 . 44 is generated at laser application, and by which the micro hole is visible because of the Umlehrbarkeit of the beam path in the subsequent consideration of the security element.
  • In an alternative process variant, not shown here, the production of the security element 12 on the second major surface of the carrier 20 first a 100 nm thick copper layer 32 applied, preferably in a vacuum vapor process. The one with the copper layer 32 coated carrier is then from the side of the microlenses 26 forth from the desired later viewing direction 54 of the first motif with laser radiation, for example, with the radiation of a Nd: YAG, Nd: YVO 4 - or fiber laser acted upon. The microlenses 26 focus the laser radiation on the first sub-layer 32 , The laser energy or laser power is chosen so that the first sub-layer 32 is removed and circular first micro holes are produced with a diameter of 3 to 8 microns. To the larger area of the first microholes 42 For example, the irradiation direction of the small amplitude laser may be circular about the desired viewing direction 54 be tilted. The laser beam moves the surface of the first motif 46 off, leaving the entirety of the first microholes 42 the first motive 46 forms.
  • Subsequently, on the copper layer 32 a 50 nm thick aluminum layer 34 applied, preferably evaporated. The coated support is then removed from the side of the microlenses 26 forth from the desired later viewing direction 50 the second motif is exposed to laser radiation. The microlenses 26 focus the laser radiation on the recording layer 30 , The laser energy or laser power is chosen so that both the first sub-layer 32 as well as the second sub-layer 34 is removed, so that through the entire recording layer 30 continuous, circular second microholes 44 (with a diameter of 2 to 4 microns) arise. The laser beam moves the surface of the second motif 48 off, leaving the entirety of the second microholes 44 the second motive 48 forms.
  • 4 shows the visual appearance of the security element thus created 12 when viewed from the side of the first main surface 22 (Front) ago, where 4 (a) and 4 (b) the appearance of two viewing directions in incident light, ie in reflection, and shows 4 (c) and 4 (d) the appearance of two viewing directions in transmitted light, ie in transmission, show.
  • In reflected light, a viewer looks out of viewing direction 54 ( 3 (b) ) through the microlenses 26 through to the microholes 42 the first sub-layer 32 and thus on the underlying second sub-layer 34 , Because of the high reflectivity of the second sub-layer 34 and the comparatively large area of the first microholes 42 is out of direction 54 the first motif (logo "G + D") bright and with good contrast silver in front of the copper-colored background of the first sub-layer 32 visible as in 4 (b) shown.
  • From another viewing direction, not the preselected viewing direction 54 of the first motif are the first microholes 42 In the incident light not visible, since the viewer in this case through the microlenses 26 through to one outside the microholes 42 lying place of first sub-layer 32 looks. The second microholes 44 are less conspicuous or not recognizable due to their much smaller surface in reflected light. Overall, the security element appears 12 from such a viewing direction thus as a homogeneous, copper surface, as in 4 (a) shown. By moving the security element back and forth 12 the viewer in the incident light between the appearances of the 4 (a) and 4 (b) switch.
  • In transmitted light is the recording layer 30 through the multitude of second microholes 44 Viewing dependent semitransparent. Because the microholes 44 in this viewing direction through the microlenses 26 through, the light incident from the backside each appears substantially at the angle through the microholes 44 in which they were introduced during generation with the laser beam. From viewing direction 50 ( 3 (a) ), the second motif formed by the second microholes (letter sequence "PL") in transmission is bright against the dark background of the metallic recording layer 30 visible as in 4 (d) shown.
  • From another viewing direction, not the preselected viewing direction 50 of the second motif, the second are microholes 44 not visible in transmitted light, as the viewer in this case through the microlenses 26 through to one outside the microholes 44 lying position of the first or second sub-layer looks. Both the first and second sub-layers are opaque, leaving the security element 12 from such a viewing direction appears as a homogeneous, dark surface, as in 4 (c) shown. By moving the security element back and forth 12 the viewer can see in transmitted light between the appearances of the 4 (c) and 4 (d) switch.
  • The different appearance in reflected light and transmitted light is unusual and surprising for a viewer and therefore leads to a visually attractive and eye-catching overall impression with high attention and recognition value.
  • 5 shows the visual appearance of the security element 12 when viewed from the side of the second major surface 24 (Back) ago, where 5 (a) the appearance in reflected light and 5 (b) the appearance illustrated in transmitted light.
  • In reflected light, only the silver-colored second partial layer is from the rear side 34 because of the continuous second microholes 44 can not be seen due to their small size in reflected light. The viewer thus sees the Homogegen silver-colored metal layer in reflected light from the back 34 , as in 5 (a) illustrated.
  • When viewed in transmitted light, the security element appears 12 through the multitude of second microholes 44 Semitransparent in a large angular range. In contrast to viewing from the front side, the second microholes become in the rear view 44 not by microlenses 26 considered. Rather, collect the microlenses 26 that from the first main area 22 incoming light and focus it on the second microholes 44 , so that there is a wide angle range, below that of the microholes 44 formed second motif 48 appears bright from the back.
  • The first microholes 42 do not go through the recording layer 30 through, so the first motive 46 because of the opaque second sub-layer 34 from the back even in transmitted light is not visible. Overall, the viewer thus sees in a wide angular range, the brightly lit letter sequence "PL" against a dark background, as in 5 (b) illustrated. Since the second motif appears mirror-inverted when viewed from the rear side, a mirror-symmetric motif is preferably selected as the second motif, or a motif that is mirror-neutral, ie a motif whose recognizability is not affected by the reflection, such as a geometric pattern, an architectural, technical or nature motive.
  • In one variant, the insertion and hence the viewing angles of the first and / or second microholes may be continuous over the extent of the first or second motif 46 . 48 be varied in one or even in two directions. Such a continuous variation can be realized for example by a suitable deflection system for the laser radiation. The brightness of the first or second subject 46 . 48 then changes when viewed in reflected light or transmitted light when tilting the security element continuously.
  • LIST OF REFERENCE NUMBERS
  • 10
    bill
    12
    security element
    14
    opening
    20
    carrier
    22, 24
    main areas
    26
    microlenses
    30
    recording layer
    32, 34
    first or second sub-layer
    40
    microholes
    42, 44
    first or second microholes
    46, 48
    first or second motif
    50
    viewing direction
    52
    focused laser radiation
    54
    viewing direction
    56
    focused laser radiation
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • EP 0219012 A1 [0005]
    • WO 2009/000528 A1 [0026]

Claims (21)

  1. Optically variable security element for security papers, value documents and other data media with A substantially transparent support having opposed first and second major surfaces, An arrangement of microlenses arranged on the first main surface of the carrier, A laser-sensitive recording layer arranged on the second main surface of the carrier and containing superimposed first and second partial layers, wherein the first partial layer is arranged between the carrier and the second partial layer, A plurality of micro-holes generated in the laser-sensitive recording layer by the action of laser radiation, each micro-hole being associated with a microlens and being visible through the associated microlens when the security element is viewed from a certain viewing angle, Wherein the plurality of microholes comprises a plurality of first and a plurality of second microholes, the first microholes being in the first sublayer and not passing through the recording layer and the second microholes passing through the first and second sublayer recording layers; - The diameter of the first microholes is greater than the diameter of the second microholes.
  2. A security element according to claim 1, characterized in that the diameter of the first microholes is more than 10%, in particular more than 20%, and particularly preferably more than 30% greater than the diameter of the second microholes.
  3. A security element according to claim 1 or 2, characterized in that the first microholes form a first motif in the form of patterns, characters or a coding, which is recognizable in reflected light viewing of the security element from a preselected first viewing direction, and the second microholes a second motif in shape form patterns, characters or a coding, which is recognizable in transmitted light observation of the security element from a preselected second viewing direction.
  4. Security element according to at least one of claims 1 to 3, characterized in that the first and / or second microholes are introduced from different directions with laser radiation through the microlens array in the recording layer and the microholes when viewed from the respective viewing direction in reflected light or transmitted light are recognizable.
  5. A security element according to at least one of claims 1 to 4, characterized in that the first and second microholes are each substantially circular or patterned.
  6. A security element according to at least one of claims 1 to 5, characterized in that the microholes are each smaller than the associated microlenses.
  7. A security element according to at least one of claims 1 to 6, characterized in that the area ratio of microholes and associated microlenses is below 1.0 or below 0.5 or even below 0.2.
  8. A security element according to at least one of claims 1 to 7, characterized in that more than 50%, preferably more than 75% of the second microholes lie within the first microholes.
  9. Security element according to at least one of claims 1 to 8, characterized in that the first and second sub-layers are formed by metal layers of different colors.
  10. Security element according to at least one of claims 1 to 9, characterized in that the second sub-layer is formed by a highly reflective metal layer having a reflectivity of 90% or more.
  11. Security element according to at least one of claims 1 to 10, characterized in that the first and / or second sub-layer is opaque.
  12. A security element according to at least one of claims 1 to 11, characterized in that a motif image is provided between the carrier and the recording layer, which is divided into a plurality of cells, in each of which imaged regions of a predetermined background motif are arranged, the microlens array forming a microlens grid, when reconstructing the motif image, reconstructs the background motif from the imaged areas arranged in the cells.
  13. Security element according to claim 12, characterized in that the motif image is present as a relief structure in an embossing lacquer layer arranged between the support and the recording layer.
  14. A security element according to claim 13, characterized in that the first and second sub-layers follow the relief of the embossing lacquer layer.
  15. Security element according to at least one of claims 1 to 14, characterized in that the microlens array with a Semitransparent cover layer and / or a present only partially covering layer is provided.
  16. A security element according to at least one of claims 1 to 14, characterized in that the microlens array is free of applied layers that affect or cancel the optical effect of the microlenses.
  17. Data carrier with a security element according to at least one of claims 1 to 16.
  18. A data carrier according to claim 17, characterized in that the security element is arranged in or over a window area or a through opening of the data carrier.
  19. Method for producing an optically variable security element for security papers, value documents and other data carriers, in which Providing a substantially transparent support with opposing first and second major surfaces, wherein an array of microlenses is disposed on the first major surface of the support, A laser-sensitive recording layer is arranged on the second main surface of the carrier, the first and second sub-layers being arranged one above the other, the first sub-layer being arranged between the carrier and the second partial layer, In the laser-sensitive recording layer, a multiplicity of micro-holes are produced by the action of laser radiation, each micro-hole being associated with a microlens and being visible from a specific viewing angle through the associated microlens when the security element is viewed, Wherein the plurality of microholes comprises a plurality of first and a plurality of second microholes, wherein the first microholes are continuously generated in the first sublayer and not by the recording layer and the second microholes are formed through the first and second sublayer recording layers; - The first micro holes are made with a larger diameter than the second micro holes.
  20. A method according to claim 19, characterized in that the first and / or second micro holes are introduced from different directions with laser radiation through the microlens array in the recording layer.
  21. A method according to claim 19 or 20, characterized in that on the second main surface of the carrier in a first step, only the first sub-layer of the laser-sensitive recording layer is generated and provided by the action of laser radiation with the plurality of first microholes, and in a second step, the second sub-layer the laser-sensitive recording layer is disposed on the first sub-layer, wherein the second micro-holes are formed through the recording layer having first and second sub-layers.
DE102012007747A 2012-04-18 2012-04-18 Optically variable security element Withdrawn DE102012007747A1 (en)

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DE102012007747A DE102012007747A1 (en) 2012-04-18 2012-04-18 Optically variable security element

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DE102012007747A DE102012007747A1 (en) 2012-04-18 2012-04-18 Optically variable security element
TW102113532A TWI574211B (en) 2012-04-18 2013-04-16 Optically variable security element
EP13717173.2A EP2838737B1 (en) 2012-04-18 2013-04-16 Optically variable security element
CN201380019304.6A CN104245346B (en) 2012-04-18 2013-04-16 Optically variable security element
PCT/EP2013/001127 WO2013156149A1 (en) 2012-04-18 2013-04-16 Optically variable security element
AU2013248632A AU2013248632B2 (en) 2012-04-18 2013-04-16 Optically variable security element
IN2263/KOLNP/2014A IN2014KN02263A (en) 2012-04-18 2014-10-17 Optically variable security element
AU2017200729A AU2017200729A1 (en) 2012-04-18 2017-02-03 Optically Variable Security Element

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CN (1) CN104245346B (en)
AU (2) AU2013248632B2 (en)
DE (1) DE102012007747A1 (en)
IN (1) IN2014KN02263A (en)
TW (1) TWI574211B (en)
WO (1) WO2013156149A1 (en)

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WO2015149939A1 (en) * 2014-03-31 2015-10-08 Giesecke & Devrient Gmbh Security element having a lenticular image
WO2017097430A1 (en) * 2015-12-10 2017-06-15 Giesecke & Devrient Gmbh Security element having a lenticular image

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GB2539390B (en) * 2015-06-10 2018-07-25 De La Rue Int Ltd Security devices and methods of manufacture thereof
CN105096738A (en) * 2015-09-11 2015-11-25 武汉威杜信息科技有限公司 Anti-counterfeiting method
CN106652767B (en) * 2017-01-19 2019-03-19 福州固钛光电科技有限公司 A kind of anti-fake material and preparation method thereof

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DE102006005000A1 (en) * 2006-02-01 2007-08-09 Ovd Kinegram Ag Multi-layer body with microlens arrangement
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TW201344588A (en) 2013-11-01
AU2013248632B2 (en) 2016-11-03
AU2017200729A1 (en) 2017-02-23
EP2838737B1 (en) 2017-12-13
WO2013156149A1 (en) 2013-10-24
CN104245346A (en) 2014-12-24
IN2014KN02263A (en) 2015-05-01
EP2838737A1 (en) 2015-02-25
AU2013248632A1 (en) 2014-11-06
CN104245346B (en) 2016-07-06

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