• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method of manufacturing a security device, comprising: providing a substrate having a first and a second face; applying an ablative coating to the first face of the substrate; sending a laser light through a mask having laser light transmitting portions corresponding to a desired imaging pattern to be formed by ablation from the ablative coating; focusing the laser light transmitted through the mask via projection optics, to form a mask image focused on the ablative coating, without passing through a first microlens array forming part of the security device; which results in removal of the ablative coating in a plurality of zones to create multiple pixels, each pattern being visible at a particular angle or range of viewing angles through the first microlens array.
    公开号:FR3070627A1
    申请号:FR1857884
    申请日:2018-09-03
    公开日:2019-03-08
    发明作者:Karlo Ivan Jolic
    申请人:CCL Security Pty Ltd；
    IPC主号:
    专利说明:

    Technical area
    The invention relates generally to security documents in which security elements are used as an anti-counterfeiting measure, and in particular the manufacture of such security documents.
    Background of the invention
    Security devices according to the prior art based on microlenses, in which an imaging component is created by ablation and / or laser marking, generally have a limited number of image channels. The reason is that each image channel is created by directing a homogenized laser beam 10 (ie, a laser beam having an energy distribution in "top hat" or "top hat", namely a flat energy profile) through a 2D image mask. The beam then passes through a network of microlenses forming part of the security device. The microlenses then focus the beam on the surface of the image plane, where ablation or laser marking is performed.
    The laser beam is incident on the plane of the microlenses at a particular relative angle. The image of the mask can then be observed by the user (in the form of a projected optical image) if he looks at the lenses from the same relative angle, which creates a safety image visible only at angles in 20 the vicinity close to the angle used to perform the ablation and / or marking.
    An advantage of this approach is that the imaging pattern is perfectly aligned with the microlenses since the imaging pattern is created by the microlenses focusing the incident laser light. A disadvantage of this approach, however, is that if more image channels are required (for example, to increase the resistance of the feature to counterfeiting, or to create more optical effects complex using multiple image channels including animations, morphing, image switching, interlaced 3D images, full 3D images and magnification moiré images), then implementing each channel additional image 30 requires the implementation of additional laser beam systems and additional laser beam paths, which makes the system very complex and expensive both from a financial and operational point of view and ultimately unsustainable as a manufacturing process.
    In the past, multiple image channels have been obtained in microlens security devices by printing imagery on the back of microlenses, using, for example, rotogravure printing or flexographic printing or offset printing. These printing techniques generally have a lower resolution than laser ablation or laser marking, so that you cannot create as many image channels with these techniques as with your ablation processes. laser / laser marking, images that are created using printing processes produce less complex optical effects and therefore have lower resistance to counterfeiting. For example, creating a high-id magnification moiré image is generally not possible with such conventional printing processes, however it is possible by means of a laser marking / ablation process , due to the higher image resolution offered by the laser. Printing processes also suffer from printing defects such as openings, which is not the case with laser printing processes.
    Multiple image channels have also been obtained in de; micro lens safety devices through the use of embossing plates in which the high resolution image pattern (which produces your multiple image channels in a micro lens device) is formed as a hollow structure in the embossing plate. The manufacturing process involves coating the embossing plate with a thin layer of UV-curable pigment ink; (ii) wiping off the excess ink so that only the hollowed-out image structures are refilled with ink; (iii) partial hardening of the pigment ink left in your hollowed out image structures; (iv) placing a transparent, UV-curable bleachable layer in contact with the embossing plate; (v) complete hardening of the removable layer and of the pigmented ink; (vi) then the detachment of the fully cured pigment ink from the structures of the embossing plate. Although this process makes it possible to obtain very high resolution images and a large number of image channels, it is very complex and very expensive, and its reliability at high production speeds on a very wide tape is up to 'now unproven
    It would be desirable to have a simpler and / or more economical method for obtaining multiple image channels in a microlens security device.
    It would be desirable to have a method of manufacturing a safety device which improves and / or eliminates one or more disadvantages of known manufacturing methods.
    Summary of invention
    One aspect of the invention provides a method of manufacturing a security device, comprising:
    providing a substrate having first and second faces; applying an ablative coating on the first face of the substrate;
    sending laser light through a mask having laser light transmitting portions corresponding to a desired imaging pattern to be formed by ablation from the ablative coating;
    focusing the laser light transmitted through the mask via projection optics, to form a mask image focused on the ablative coating, without passing through a first array of microlenses forming part of the safety device, this which results in the removal of the ablative coating in a plurality of areas to create multiple patterns, each pattern being visible at a particular angle or range of viewing angles through the first array of microlenses.
    In one or more embodiments, the ablative coating has a first layer of pigment ink which substantially absorbs laser light.
    In one or more embodiments, the first layer of pigment ink substantially absorbs UV laser light, including one or more of any ÜV laser lights of 157 nm or 193 nm or 248 nm or 266 nm or 308 nm wavelengths or 355 nm.
    In one or more embodiments, the first layer is part of an opacifying layer or of a drawing layer of a security document carrying the security device.
    In one or more embodiments, the ablative coating further includes at least one second layer of pigment ink which substantially absorbs laser light, each of the first and at least one second layer of pigment ink having different colors.
    In one or more embodiments, the second layer of pigment ink substantially absorbs UV laser light, including one or more of any UV laser lights of wavelength 157 nm or 193 nm or
    248 nm or 266 nm or 308 nm or 355 nm.
    In one or more embodiments, the at least one second layer is part of the opacifying layer or drawing layer.
    In one or more embodiments, before passing through the mask, the laser light is homogenized by means of a homoqénéateur so as to have a density of spatial energy substantially uniform in a plane perpendicular to the direction of the incident laser light.
    In one or more embodiments, the focal mask image is sent to the ablative coating at a normal angle of incidence.
    In one or more embodiments, the thickness of the ablative coating is selected such that a single pulse of the laser beam has sufficient energy density to perform ablation.
    In one or more embodiments, the projection optics reduce and focus the mask image on the ablative coating so that the energy density in the focused mask image is sufficient to ablate the using a single laser beam pulse.
    In one or more embodiments, the substrate is optically transparent.
    In one or more embodiments, the first microlens array is formed on the second face of the substrate prior to removal of the ablative coating from the plurality of zones.
    In one or more embodiments, the first microlens array is formed on the first side of the substrate prior to the ablative coating being received in the plurality of areas, the microlenses not covering the areas to be removed by ablation.
    In one or more embodiments, the first microlens array is formed on the first or second side of the substance after the ablative coating has been removed from the plurality of zones.
    In one or more embodiments, the substra substantially transmits the laser light, and the laser light passes through it if bst at to focus on the ablative coating.
    In one or more embodiments, after the laser ablation has been performed, a second array of microlenses is applied to an ace of the substrate which is opposite to that of the first array of microlenses, so that the second microlens array focuses light on areas subjected to laser ablation.
    Another aspect of the invention provides a method for manufacturing a security device, comprising:
    providing a substrate having first and second faces, the substrate having laser light absorbing additives at a surface on the first face of the substrate, or in a plane located below the surface;
    sending laser light through a mask having laser light transmitting portions corresponding to a desired imaging pattern to be marked;
    focusing the laser light transmitted through the mask via projection optics, to form a mask image focused on the surface of the first face of the substrate, or on a plane located below the surface, without pass through a first network of microlenses forming part of the security device, which results in a marking of the surface on the first face of the substrate or of the plane situated below the surface in a plurality of zones to create multiple patterns, each pattern being visible at a particular angle or range of viewing angles through the microlens array.
    In one or more embodiments, the laser light absorbing additives are located in a skin layer at the first side of the material or in a layer below the surface of the substrate.
    In one or more embodiments, the laser light absorbing additives substantially absorb UV laser light, including one or more of any UV laser lights of wavelength 157 nm or 193 nm or 248 nm or 266 nm or 308 nm or 355 nm, or IR laser light, including one or more of any wavelengths 1060 nm or 1064 nm or 10.6 microns, or visible laser light including visible laser light of wavelength 532 nm.
    In one or more embodiments, before passing through the 2D mask, the laser light is homogenized by means of a homogenizer so as to have a substantially uniform spatial energy density in a plane perpendicular to the direction of incident laser light.
    In one or more embodiments, the focused mask image is sent over the surface of the first face of the material or plane located below the surface at a normal angle of incidence.
    In one or more embodiments, the additive charge; absorbing the laser light is selected so that a single pulse of the laser beam has an energy density sufficient to effect a local change in contrast or color in your areas exposed to laser radiation.
    In one or more embodiments, the projection optics reduce and focus the mask image on the laser light absorbing additives so that the energy density in the focused mask image is sufficient to effect a change contrast or color room in your areas exposed to laser radiation using a single pulse ie laser beam.
    In one or more embodiments, the substrate is optically transparent.
    In one or more embodiments, the first array of microlenses is formed on the first or second side of the substance before being lasered in the plurality of zones.
    In one or more embodiments, the first array of microlenses is formed on the first or second side of the substance which is laser marked in the plurality of zones.
    In one or more embodiments, the first array of microtenses is formed on the second face of the substrate.
    In one or more embodiments, after the stirring has been carried out, a second array of microlenses is applied to a face of the substrate which is opposite to that of the first array of microlenses, so that the second array of microlenses focuses the light on laser marked areas.
    In one or more embodiments, is the mask a ma than 2D.
    Another aspect of the invention makes available a safety device, manufactured according to one or more of the methods described above.
    Brief description of the drawings
    We will now describe embodiments of the invention with reference to the accompanying drawings. It will be understood that the embodiments are given by way of illustration only and that the invention is not limited to this illustration. In the drawings:
    Figure 1 is a first embodiment of a security device made in accordance with the present invention, in which multiple image channels can be seen by a user from different angles of view;
    Figures 2 and 3 describe how a user can see the different image channels in the security device shown in Figure 1;
    Figure 4 is a laser ablation / marking apparatus used for the manufacture of the safety device shown in Figures 1 to 3;
    Figures 5 and 6 are schematic representations of two different safety devices which can be formed by laser ablation;
    Figures 7 and 8 are schematic representations of a safety device which can be formed by laser marking; and Figure 9 is an enlarged image of a pattern which can be formed by ablation or marking in an imaging layer of any of the safety devices shown in Figures 1 to 3 and 5 to 8.
    detailed description
    Definitions
    Security document or authentication token
    As used herein, the terms "security document" and authentication token include all types of documents and value authentication and document identification tokens including, but not limited to, the following documents : items of currency such as banknotes and coins, credit cards, checks, passports, identity cards, stock certificates and certificates, driver's license, deeds of ownership, transport documents such as plane tickets or train tickets, entry cards and tickets, birth, death and marriage certificates, and transcripts.
    The invention applies in particular, but not exclusively, to security documents or authentication tokens such as banknotes or identification documents such as identity cards or passports formed from a substrate on which one or more printing layers are applied. The diffraction gratings and optically variable devices described in this document may also have application in other products, such as packaging.
    Safety device or feature
    As used herein, the term security device or feature includes any one of a large number of security devices, elements or features intended to protect the security document or authentication token from counterfeiting, copying, alteration or falsification. Security devices or characteristics can be produced in or on the substrate of the security document or in or on one or more layers applied to the base substrate, and can take a wide variety of forms, such as security wires. embedded in layers of the security document; of: security inks such as fluorescent, luminescent and descending phosph inks, metallic inks, iridescent inks, photoc bromic, thermochromic, hydrochromic or piezochromic inks; printed and embossed features, including relief structures; layers of reference; liquid crystal devices; lenses and lenticular structures; optically variable devices (OVD) such as diffractive devices i icluting diffraction gratings, holograms, diffractive optical elements (DDE).
    substratum
    As used here, the term substrate refers to the base material from which the security document or authentication token is formed. The base material can be paper or another fibrous material, such as cedulose; a plastic or polymeric material including, but not limited to, polypropylene (PP), polyethylene (PE), polycarbonate (PC), polyvinyl chloride (PVC), polyethylene terephthalate (PET), 1e biaxially oriented polypropylene (3OPP); or a composite material of two or more materials such as a paper laminate and at least one plastic material, or two or more polymeric materials.
    Transparent windows and half-windows
    As used herein, the term window refers to a parent or translucent tram area in the security document as compared to the substantially opaque region on which printing is applied. The window can be completely transparent so that it transmits the substrate light: without modification, or it can be partially transparent or partially translucent by allowing the transmission of light but without allowing objects to be seen clearly through the window area.
    A window area can be formed in a polymeric release document which has at least one layer of transparent polymeric material and one or more opacifying layers applied to at least one side of a transparent polymeric substrate, by omitting at least an opacifying layer in the region forming the window area. If opacifying layers are applied to both sides of a transparent substrate, a fully transparent window can be formed by omitting the opacifying layers on both sides of the transparent substrate in the window area.
    A partially transparent or translucent area, hereinafter referred to as a half-window, can be formed in a polymeric security document which has opacifying layers on both sides by omitting the opacifying layers on one side of the security document in the window area, so that the half window is not completely transparent, but allows a certain amount of light to pass through without allowing objects to be seen clearly through the half window.
    Alternatively, the substrates may be formed from a substantially opaque material, such as paper or fibrous material, with an insert of transparent plastic material inserted into a cutout or recess formed in the substrate paper or fibrous to form a transparent window area or a translucent half-window.
    Opacifying layers
    One or more opacifying layers can be applied to a transparent substrate to increase the opacity of the security document. An opacifying layer is such that LT <LO, where LO is the amount of light incident on the document and LT is the amount of light transmitted through the document. An opacifying layer can include any one or more of various opacifying coatings. For example, opacifying coatings may include a pigment, such as titanium dioxide, dispersed in a binder or carrier of crosslinkable heat activated polymeric material. Alternatively, a substrate of transparent plastic material could be sandwiched between opacifying layers of paper or other partially or substantially opaque material on which marks can then be printed or otherwise applied.
    Ablation
    In the context of the present application, the ablation of a material is defined as the removal of this material at the ablation point. More specifically, the removal of the entire material from the affected area, to form openings in the ablative layer, or the at least partial removal of the material from the surface of a layer.
    Laser marking
    In the context of the present application, the laser marking of a material is defined as the exposure of the material to laser radiation, resilient in a color change or other similar visible changes in the area irradiated by the laser. .
    drawings
    Referring now to Figure 1, which shows part of a safety device 2 having a substantially transparent substrate 4, an opaque or reflective ablative coating 6 on a first face 8 of the substrate 4 and a microlens array 10 on a second face 12 of the substrate 4. The array of microlenfilles 10, which is also known by the name of lenticjlahe array, can include aspherical or asymmetrical microtenses or an appropriate mixture of the two. Aspherical micro-lenses can be used to better match your refractive indices of the micro-girl material and substrate, if they are different, and help reduce spherical aberrations.
    Openings 14 and 16 are formed by ablation from the ablative coating 8. A person looking at the safety device 2 will be able to see a change in your optical characteristics of the area on which the array of microtentils 10 is arranged. In particular, if a person changes the <ngle according to which he looks at the safety device 2, he will respectively see the zones 14 at the first angle θ and the zones 16 at the second angle φ. the choice of different patterns for each of the openings 14 and 16 allows a tilting image to be created. More precisely, when switching or rotating a security document, the visible image switches between the patterns or images created at each view range.
    In this example, the security device 2 comprises two image channels, that is to say that two images can be seen from different viewing angles. It will be understood that additional aperture patterns can be formed by ablation from the ablative coating 6 to create channels of image i ddhnels (images which can be seen from additional viewing angles).
    Let us now refer to Figure 2, which presents a security document 18 which, in this case, is a bank note and includes the security device 2 described in relation to Figure 1. The security document 18 is seen according to an angle, relative to its surface, approximately equal to the first angle Θ, so that the areas formed by ablation 14 are visible through the array of microlenses 10, since they do not reflect light in the same way as the ablative layer 8, showing a pattern representing your numbers “123,
    Figure 3 then presents the same security document 18 seen from the second angle φ. In this case, it is the areas formed by ablation 16 which are visible through the microlens array 10, showing a pattern representing the numbers “456”.
    In a preferred embodiment, the ablative layer 8 reflects light when viewed through the microlens array 10. In this way, areas which have been ablated do not reflect light, which produces a distinct contrast when a person changes the angle of view so that the microlenses focus on the reflective and non-reflective areas.
    Figure 4 depicts a laser ablation / marking apparatus 30 designed to manufacture the security document 18 depicted in Figures 2 and 3. The apparatus 30 includes a laser 32, a beam delivery system 34 including mirrors 36 , 38, 40 and 42, a beam expander 44 and a homogenizer 46. The apparatus 30 further comprises a dielectric mask 48 having characteristics of mioronic size, as well as projection optics 50 including, in this example, a lens 2 to 9 element CaF transfer for image reduction. A computer 52 controls the operation of the laser 32, and using the feedback on the surface speed and the position of a roller 54 over which passes a sheet of substrate 56, one or more safety devices are positioned on the path laser light 58. Other configurations are also possible, in which the sheet or sheet of substrate is not in contact with a roller during marking and / or ablation.
    The ablation / laser marking apparatus 30 can be integrated into a tablecloth or sheet feeding process, such as a printing process for the production of security documents. This allows for laser marking and / or laser ablation to be performed in line with a security document manufacturing process. In an example of this configuration, the laser can be activated by the computer when the laser marking and / or laser ablation zones are aligned with an alignment mark on the sheet or sheet which was applied earlier. in your process.
    FIG. 5 describes a security device 70 which can be worn as a jar or be part of a security document, itself carried by the web substrate 56.
    The substrate 72 of the security device 70 is coated with an elbow 74 of a pigmented ink which substantially absorbs laser light, preferably UV laser light, more particularly UV laser light of wavelength 157 nm or 193 nm or 248 nm or 308 nm.
    Optionally, the substrate 72 is also coated with one or more layers 76 and 78 of pigmented ink. The layers each have a different color, overlapping or not, which substantially absorbs laser light, preferably UV laser light, more particularly UV iser light of wavelength 157 nm or 193 nm or 248 nm or 308 nm .
    Optionally, one or more of the pigment ink layers 74, 76 and 78 can be part of an opacifying layer or of a drawing layer of the security document.
    During manufacture, the beam 58 of laser light, preferably homogenized by means of a homogenizer 46 so as to have a substantially uniform spatial energy density in a plane perpendicular to the direction of the beam, is directed at through the 2D mask 48 which comprises parts transmitting the laser light corresponding to a desired imaging pattern to be formed by ablation.
    After passing through said mask 48, the laser beam 58 is directed through the projection optics 50 to form a mask image focused on the surface of the layer or layers of pigment ink which is to be ablated, preferably at a normal angle of incidence. Because the 11 resolution of laser ablation is very high (for example, in the case of a UV laser mask projection system, characteristics as small as 2 microns can be formed by laser ablation), this means that a large number of image channels can be used in the imaging pattern to be formed by ablation.
    Preferably, the thickness of the layer or layers of pigmented ink is chosen such that 1 pulse or 1 shot of laser beam has i a sufficient energy density to perform ablation.
    Preferably, the beam delivery optics from the mask 48 on the pigmented ink reduce and focus the mask image on the pigmented ink, so that the energy density in the focused mask image is sufficient to perform ablation with 1 pulse or 1 laser beam shot.
    Preferably, the substrate 72 is optically transparent, which allows the application of microlenses 80 on the face of the substrate which is opposite to that of the ablative coating, either before or after the laser ablation step.
    Optionally, after the laser ablation has been performed, a second set of microlenses can be applied to the face of the substrate which is opposite to that of the first set of microlenses, so that the second set of microlenses is focused. on the areas formed by laser ablation. This configuration produces images with an enlarged optical effect, which can be seen from both sides of the security device.
    If the substrate 72 substantially allows the transmission of laser light, the beam 58 can optionally pass through the substrate 72, so that it focuses on the interface between the substrate and the pigmented ink, that is to say -to say that in this configuration, the ablation is carried out by directing the beam so as to focus it through the substrate on the reverse side of the pigmented ink.
    In a variant shown in Figure 6, a substrate 82 is made of non-transparent materials, for example opaque materials on which a layer 84 of ink, and optionally one or more other layers, can be printed and then directly subjected to ablation laser. In this case, the microlenses 86 can be applied by lamination or another suitable technique on the imaging layer subjected to ablation to produce the security device 88.
    In addition to using an ablation to make a safety device, the apparatus 30 can be used to make safety devices by laser marking of laser light absorbing additives, such as TiO 2 , located at on the surface or in a layer inside a substrate. The layer thickness is preferably less than the depth of field of the focused laser light, for example, up to 5-10 microns maximum. Polymers having skin layers containing laser light absorbing additives, such as TiO 2 , can also be used. Transparent or opaque polymers can be used.
    To guarantee sufficient resolution for the marking of microlens imaging for bank note / document applications of: scale, laser light having a wavelength of 1 micron or less is preferred.
    Preferably, UV laser wavelengths such as 157 nm or 193 nm or 248 nm or 308 nm and substrates having additives to ΠΟ2 and / or j ZnO are used.
    During manufacture, the laser light beam 58, preferably UV laser light, is preferably homogenized through the homogenizer 46 so that it has a substantially uniform spatial energy density in a plane perpendicular to the beam direction, and directed through the 2D mask 48 in which the parts transmitting the laser light correspond to the desired imaging pattern which must be marked on the substrate.
    After passing through said mask 48, the laser beam is directed through the projection optics 50 so as to form a mask image focused on the surface 94 of the substrate 92 which must be marked, preferably at an angle normal incidence. Again, because the resolution of the laser marking is very high (for example, in the case of a UV laser mask projection marking system, characteristics as small as a few microns can be laser marked on layers of skin or polymer loaded with TiO 2 additives), this means that a large number of image channels can be used in the imaging pattern to be marked.
    Preferably, the percentage of charge in additives absorbing the laser light is chosen so that 1 pulse or 1 shot of laser beam has the energy density sufficient to effect a local change in contrast or color in your areas exposed to the laser radiation.
    Preferably, the beam delivery optics from the mask 48 on the surface 94 of the substrate having laser light absorbing additives reduce and focus the mask image on the surface such that the energy density of the focused mask image is sufficient to create a contrast mark with 1 pulse or 1 laser beam shot.
    Preferably, the substrate 92 having additives absorbing laser light is substantially optically transparent, which allows the application of microlenses 96 on the opposite face, either before or after the laser mirroring step.
    In a first variant shown in FIG. 7, a safety sneeze 100 includes a substrate 102 in which the additives absorbing the laser light are located in a layer of skin 104 at a first face 106 of the substrate 102.
    Alternatively, as shown in Figure 8, a security device 110 may include a substrate 112 in which the laser light absorbing additives are in a layer 114 located below the surface 116 of the substrate 112. In in this case, the polymer layer between the laser source and the layer 116 should transmit the laser source.
    In the variants described in FIGS. 7 and 8, microlenses 108 and 118 are applied respectively to the safety devices 100 and 110, either before or after the laser marking step.
    Optionally, after laser marking has been performed, a second set of microlenses can be applied to the face of the substrate which is opposite to that of the first set of microlenses, so that the second set of microlenses is focused on your areas laser marked. This configuration produces images with an enlarged optical effect, which can be seen from either side of the security device.
    Figure 9 depicts an enlarged image 120 of icons of the letter A ”formed by laser ablation, having a pitch of 50 microns (suitable for magnification moiré), suitable for producing an optical moiré magnification effect in your devices described above. It will be understood that this is only an example of a pattern which can be formed by ablation or marked in the manner described above.
    Embodiments of the invention provide a simpler and more economical method for obtaining multiple image channels by ablation and / or laser marking in an already existing microlens safety device.
    It is currently counterintuitive to form ablation or marking imagery on a lens-based device without focusing the laser light through a network of microlenses forming part of the safety device, due to industry assumptions regarding the fact that this focus is necessary to achieve alignment.
    However, if a roll-to-roll process is used to create your lenses and imagery, it is simple to get good angular alignment, that is, the skew between your lenses and imaging can be tightly controlled and can be minimized to an acceptable level. The alignment tolerance of the position of the imagery created with the laser, in relation to the lens array, will mainly depend on the alignment tolerance of the lenses (the position of the laser optics should be much more constant and very precise).
    In the flexible embossing process used by the applicant to produce various security documents, the position of the lenses will typically vary by +/- 0.25 mm, which is much larger than the typical size of a microlens on a ticket. so that it will in fact not be possible to control the relative alignment in XY in order to guarantee that the same image channel 10 is projected to an observer from a given angle of view (while the method consisting in passing the laser through the lenses to create the imagery produces a very precise alignment, that is to say that the image channel projected to an observer at a given angle of view will always be the same, d 'a bank note to another). Despite this, even if the image channel projected at a given angle varies from one banknote to another, it is not necessarily a problem that the user will still generally perceive that the drawing of projected image is the same image from one banknote to another.
    权利要求:
    Claims (31)
    [1" id="c-fr-0001]
    1. Method for manufacturing a security device, comprising:
    providing a substrate having first and second faces; applying an ablative coating on the first face of the substrate;
    sending laser light through a mask having laser light transmitting portions corresponding to a desired imaging pattern to be formed by ablation from the ablative coating;
    focusing the laser light transmitted through the mask via projection optics, to form a mask image focused on the ablative coating, without passing through a first array of microlenses forming part of the safety device, this which results in removal of the ablative coating in a plurality of areas to create multiple patterns, each pattern being visible at a particular angle or range of viewing angles through the first array of microlenses.
    [2" id="c-fr-0002]
    2. The method of claim 1, wherein the ablative coating comprises a first layer of pigmented ink which substantially absorbs laser light.
    [3" id="c-fr-0003]
    3. The method of claim 2, wherein the first layer of pigment ink substantially absorbs UV laser light, including one or more of any UV laser lights of wavelength 157 nm or 193 nm or 248 nm or 266 nm or 308 nm or 355 nm.
    [4" id="c-fr-0004]
    4. Method according to either of claims 2 and 3, wherein the first layer is part of an opacifying layer or of a drawing layer of a security document carrying the security device.
    [5" id="c-fr-0005]
    5. Method according to any one of claims 2 to 4, in which the ablative coating further comprises at least one second layer of pigmented ink which substantially absorbs laser light, each of the first and of at least one second layer of pigment ink having a different color.
    [6" id="c-fr-0006]
    6. The method of claim 5, wherein the second layer of pigmented ink substantially absorbs UV laser light, including one or more of any UV laser lights of wavelength 157 nm or 93 nm or 248 nm or 266 nm or 308 nm or 355 nm.
    [7" id="c-fr-0007]
    7. Method according to either of claims 5 and 6, when dependent on claim 4, in which the at least one second layer is part of the opacifying layer or of the design layer.
    [8" id="c-fr-0008]
    8. Method according to any one of the preceding claims, in which, before passing through the mask, the laser light is homogenized by means of a homogenizer so as to have a substantially uniform spatial energy density in a plane perpendicular to the direction of the incident laser light.
    [9" id="c-fr-0009]
    9. Method according to any one of the preceding claims, in which the focused mask image is sent to the abla if coating at a normal angle of incidence.
    [10" id="c-fr-0010]
    10. Method according to any one of the preceding claims, in which the thickness of the ablative coating is selected such that a single pulse of the laser beam has an energy density sufficient to effect ablation.
    [11" id="c-fr-0011]
    11. Method according to any one of the preceding claims, in which the projection optics reduce and focus the mask image on the ablative coating so that the energy density in the focused mask image is sufficient to perform ablation using a single laser beam pulse.
    [12" id="c-fr-0012]
    12. Method according to any one of the preceding claims, in which the substrate is optically transparent.
    [13" id="c-fr-0013]
    13. The method of claim 12, wherein the first microlens array is formed on the second face of the substrate before removal of the ablative coating in the plurality of zones.
    [14" id="c-fr-0014]
    14. The method of claim 12, wherein the first array of microtenses is formed on the first face of the substrate before the removal of the ablative coating in the plurality of areas, your microlenses do not cover the areas to be removed by ablation.
    [15" id="c-fr-0015]
    15. The method of claim 12, wherein the first microlens array is formed on the first or second face of the substrate after the removal of the ablative coating in the plurality of zones.
    [16" id="c-fr-0016]
    16. Method according to any one of the preceding claims, in which the substrate transmits substantially the laser light, and in which the laser light passes through the substrate to focus on the ablative coating.
    [17" id="c-fr-0017]
    17. Method according to any one of the preceding claims, in which, after the laser ablation has been carried out, a second array of microlenses is applied to a face of the substrate which is opposite to that of the first array of microlenses, so that the second array of microlenses focuses light on the areas subjected to laser ablation.
    [18" id="c-fr-0018]
    18. Method of manufacturing a security device, including:
    providing a substrate having first and second faces, the substrate comprising additives absorbing laser light at a surface on the first face of the substrate, or in a plane located below the surface;
    sending laser light through a mask having laser light transmitting portions corresponding to a desired imaging pattern to be marked;
    focusing the laser light transmitted through the mask via projection optics, to form a mask image focused on the surface of the first face of the substrate, or on a plane located below the surface, without pass through a first network of microlenses forming part of the security device, which results in the marking of the surface on the first face of the substrate or of the plane situated below the surface in a bedrock of zones to create multiple patterns , each motif being visible according to a symbol or a range of particular viewing angles through the microlens array
    [19" id="c-fr-0019]
    19. The method of claim 18, wherein the laser light absorbing additives are in a skin layer at the first face of the substrate or in a layer below the surface of the substrate.
    [20" id="c-fr-0020]
    20. Method according to either of claims 18 and 19, in which the laser light absorbing additives substantially absorb UV laser light, including one or more of any UV laser lights of wavelength 157 nm or 193 nm or 248 nm or 266 nm or 308 nm or 355 nm, or IR laser light, including one or more of any wavelengths 1060 nm or 1364 nm or 10.6 microns, or visible laser light including light visible laser with wavelength 532 nm.
    [21" id="c-fr-0021]
    21. The method as claimed in any one of claims 18 to 20, in which, before passing through the 2D mask, the laser light is homogenized by means of a homogenizer so as to have a density of spatial energy. substantially uniform in a plane perpendicular to the direction of the incident laser beam.
    [22" id="c-fr-0022]
    22. The method according to any one of claims 18 to 21, in which the focused mask image is sent onto the surface of the first face of the material or the plane situated below the surface at a normal angle of incidence.
    [23" id="c-fr-0023]
    23. The method as claimed in any one of claims 18 to 22, in which the load of additives absorbing the laser light is selected such that a single pulse of the laser beam has a sufficient energy density to effect a local change in contrast or color in areas exposed to laser radiation.
    [24" id="c-fr-0024]
    24. Method according to any one of claims 18 to 23, in which your projection optics reduce and focus the mask image on your laser light absorbing additives so that the energy density in the mask image focused is sufficient to effect a local change in contrast or color in your areas exposed to laser radiation using a single laser beam pulse.
    [25" id="c-fr-0025]
    25. Method according to any one of claims 18 to 24, in which the substrate is optically transparent.
    10
    [26" id="c-fr-0026]
    26. The method of claim 25, wherein the first array of micro-lenses is formed on the first or second face of the substrate before laser marking in the plurality of zones.
    [27" id="c-fr-0027]
    27. The method of claim 25, wherein the first network of 15 microlentilies is formed on the first or second face of the substrate after laser marking in the plurality of zones.
    [28" id="c-fr-0028]
    28. Method according to any one of claims 18 to 25, in which the first network of microlentilies is formed on the second face of the substrate.
    [29" id="c-fr-0029]
    29. Method according to any one of claims 18 to 28, in which, after the marking has been carried out, a second network of microlenses is applied to a face of the substrate which is opposite to that of the first network of microlentils, such so that the second network of microlentilies focuses 1a
    25 light on laser marked areas.
    [30" id="c-fr-0030]
    30. Method according to any one of the preceding claims, in which the mask is a 2D mask.
    30
    [0031]
    31. Safety device manufactured according to claims 1 to 17 and / or claims 18 to 30.
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    同族专利:
    公开号 | 公开日
    WO2019046891A1|2019-03-14|
    AU2017101215A4|2017-10-05|
    AU2017101215B4|2018-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2006102700A1|2005-03-29|2006-10-05|Note Printing Australia Limited|Tamper evident identification documents|
    US20120091703A1|2009-04-06|2012-04-19|Reserve Bank Of Australia|Security document with an optically variable image and method of manufacture|
    DE102009048145A1|2009-10-02|2011-04-07|Giesecke & Devrient Gmbh|Disk with window|
    US8755121B2|2011-01-28|2014-06-17|Crane & Co., Inc.|Laser marked device|
    GB201117523D0|2011-10-11|2011-11-23|Rue De Int Ltd|Security devices and methods of manufacture thereof|WO2019076805A1|2017-10-20|2019-04-25|Koenig & Bauer Ag|Security element or security document|
    DE102017218804A1|2017-10-20|2019-04-25|Koenig & Bauer Ag|Method for producing a printed image having security element or a security document|
    DE102018005697A1|2018-07-19|2020-01-23|Giesecke+Devrient Currency Technology Gmbh|Security element with lenticular image|
    DE102018005705A1|2018-07-19|2020-01-23|Giesecke+Devrient Currency Technology Gmbh|Security element with lenticular image|
    法律状态:
    2020-03-27| PLSC| Search report ready|Effective date: 20200327 |
    2020-10-16| ST| Notification of lapse|Effective date: 20200910 |
    优先权:
    申请号 | 申请日 | 专利标题
    AU2017101215A|AU2017101215B4|2017-09-05|2017-09-05|Laser marking and/or ablation to create micro-imagery for micro-lens security features|
    AU2017101215|2017-09-05|
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