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WO2025193748A1 - Dispositif de sécurité micro-optique simple face - Google Patents

Dispositif de sécurité micro-optique simple face

Info

Publication number
WO2025193748A1
WO2025193748A1 PCT/US2025/019440 US2025019440W WO2025193748A1 WO 2025193748 A1 WO2025193748 A1 WO 2025193748A1 US 2025019440 W US2025019440 W US 2025019440W WO 2025193748 A1 WO2025193748 A1 WO 2025193748A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
focusing
focusing elements
icon
substrate
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.)
Pending
Application number
PCT/US2025/019440
Other languages
English (en)
Inventor
Jonathan D. GOSNELL
Howard Gao
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.)
Crane and Co Inc
Original Assignee
Crane and Co Inc
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 Crane and Co Inc filed Critical Crane and Co Inc
Publication of WO2025193748A1 publication Critical patent/WO2025193748A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; 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
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; 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
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs

Definitions

  • Couple and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another.
  • the term “or” is inclusive, meaning and/or.
  • FIGURE 1 illustrates an example of a security document including a micro-optic security device
  • FIGURES 2A-2C illustrate examples of security documents comprising reduced-plastic, single-sided security devices according to various embodiments of this disclosure
  • FIGURE 3 illustrates an example of a method for producing security documents comprising reduced-plastic, single sided security devices according to various embodiments of this disclosure.
  • FIGURES 4A and 4B illustrate an example portion of a security device in accordance with this disclosure.
  • FIGURES 1 through 4B discussed below, and the various embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged security document.
  • FIGURE 1 illustrates an example of a known architecture for a micro-optic security device 100, which is incorporated in a security document 160.
  • micro-optic security device 100 comprises a focusing layer comprising a plurality of focusing elements 105 (including, for example, focusing element 107), and an arrangement of image icons 120 (including, for example, image icon 121.
  • focusing element of plurality of focusing elements 105 has a footprint, in which one or more image icons of arrangement of image icons 120 is positioned.
  • micro-optic security device 100 is, in many cases, a trusted visual indicium of a security document’s (for example, security document 160) authenticity.
  • Plurality of focusing elements 105 comprises a planar array of refractive focusing elements.
  • the focusing elements of plurality of focusing elements 105 comprise micro-optic refractive focusing elements (for example, plano-convex or GRIN lenses).
  • Refractive focusing elements of plurality of focusing elements 105 are, in some embodiments, produced from cured light curable resins (for example, by cast-curing), wherein the cured resin has an index of refraction ranging from 1.35 to 1.7.
  • Variations on micro-optic security device 100 in which plurality of focusing elements 105 are reflective focusing elements (i.e., micro-mirrors) are also possible.
  • Materials suitable for forming plurality of focusing elements 105 include, without limitation, substantially transparent, colored or colorless polymers such as acrylics, acrylated polyesters, acrylated urethanes, epoxies, polycarbonates, polypropylenes, and the like.
  • Various methods of providing the layer of focusing elements can include extrusion, radiation cured casting, injection molding, reaction injection molding or reaction casting.
  • the focusing elements of plurality of focusing elements 105 can be characterized by an F#, which may be adjusted as desired to modify the synthetic image and its optical effect. Suitable F numbers, in view of the desired thickness of the security film or security device, can be adjusted to be less than 10, or in some embodiments less than about 4, or in some embodiments, less than 2 or 1.
  • the synthetic image can also be modulated by the relative arrangements and alignments of the array of focusing elements to the array of image elements and each array has respective repeat periods. The repeat periods of the respective arrays may be adjusted such that their ratios are equal to 1, slightly above or slightly below 1; though ratios substantially above and substantially below 1 are also contemplated.
  • Base diameters of the focusing elements may also be adjusted as desired and it is within the scope of the present disclosure that these base diameters could have ranges of 200 pm to 500 pm; 50 pm to 200 pm; less than 50 pm (such as less than about 45 pm or ranging from about 10 pm to about 40 pm).
  • the focusing elements may further be modified by adjusting the focal lengths such that the focal lengths allow for image elements in the array of image elements to be viewed through the focusing element and project a synthetic image.
  • Focal lengths of less than 50 pm are suitable, such as less than 45 pm, such as ranging from about 10 pm to about 30 pm.
  • arrangement of image icons 120 comprises a set of image icons (including image icon 121), positioned at predetermined locations within the footprints of the focusing elements of plurality of focusing elements 105.
  • the individual image icons of arrangement of image icons 120 comprise regions of light cured material associated with the focal path of structured light (for example, collimated UV light) passing through plurality of focusing elements 105 from a projection point associated with one or more predetermined ranges of viewing angles.
  • the individual image icons of arrangement of image icons 120 are not provided within a structured image icon layer.
  • structured image layer encompasses a layer of material (for example, a light- curable resin) which has been embossed, or otherwise formed to comprise retaining structures (for example, recesses, posts, grooves, or mesas) for positioning and retaining image icon material.
  • the individual image icons of arrangement of image icons 120 are provided within a structured image layer, the structured image layer comprising one or more of voids, mesas, or posts, which act as retaining structures to hold micro- and nano-scale volumes of colored material.
  • an arrangement of image icons comprises icons of a single color.
  • image icons of arrangement of image icons 120 comprise icons of two or more colors.
  • the relief structures of the icon layer may operate as the image icons.
  • the embossed material may be pigmented and semi-opaque, and the variances in thickness of the relief structures may create points of contrast which can be projected through plurality of focusing elements 105 to provide a synthetic image.
  • micro-optic security device 100 includes an optical spacer 110.
  • Optical spacer 110 comprises a fdm of substantially transparent material which operates to position image icons of arrangement of image icons 120 in or around the focal plane of focusing elements of plurality of focusing elements 105.
  • optical spacer 110 comprises a manufacturing substrate upon which one or more layers of light curable material can be applied, to form one or more of arrangement of image icons 120 or plurality of focusing elements 105.
  • optical spacer 110 provides micro-optic security device 100 with sufficient structural integrity to facilitate mechanized and automated handling and storage, such as in reel-to-reel processes, without stretching or tearing.
  • optical spacer 110 provides clear manufacturing and technical benefits, these benefits come at the cost of increased plastic use (particularly over large document runs), and absent mitigation measures (for example, stronger adhesives or creating failure points in micro-optic security device 100).
  • micro-optic security device 100 comprises one or more regions of light-cured protective material which occupy the spaces between the image icons of arrangement of image icons 120.
  • the arrangement of image icons 120 is first formed (for example, by selectively curing and removing liquid light-curable material on optical spacer 110), and then a layer of clear, light-curable material is applied to fill spaces between the image icons of arrangement of image icons 120 and then flood-cured to create a protective layer, which protects the image icons from being moved from their positions within the footprints of focusing elements of plurality of focusing elements 105.
  • the light-curable material used to form arrangement of image icons 120 is a pigmented, ultraviolet (UV)-curable polymer.
  • arrangement of image icons 120 is affixed to a second substrate 130, which operates to protect and secure arrangement of image icons 120 and provide an interface for attaching micro-optic security device 100 to a substrate 150 as part of security document 160.
  • micro-optic security device 100 is affixed to substrate 150 during the manufacture of substrate in a papermaking machine, such as a Fourdrinier machine.
  • micro-optic security device 100 is affixed to substrate 150 by a layer of adhesive between the arrangement of image icons and a top surface of substrate 150.
  • Micro-optic security device 100 can include a seal layer 140.
  • seal layer 140 comprises a thin (for example, a 2pm to 50pm thick) layer of substantially clear material which interfaces on a lower surface, with focusing elements of the plurality of focusing elements 105 and comprises an upper surface with less variation in curvature (for example, by being smooth, or by having a surface whose local undulations are of a larger radius of curvature than the focusing elements) than the plurality of focusing elements 105.
  • the upper surface of seal layer 140 is formed from a thermoplastic material which can be ultrasonically welded to a surface comprising a cellulosic material.
  • micro-optic security device 100 can be attached to substrate 150, to form a security document 160.
  • substrate 150 comprises a sheet of material with at least one surface.
  • substrate 150 can be a polymeric substrate (for example, a section of PET or BOPP film).
  • substrate 150 can be a fibrous substrate comprising cellulosic material, such as wood pulp, cotton fiber, linen fiber, flax fiber, sisal fiber, hemp fiber, Abaca fiber, Kozo fiber, Mitsumata fiber, bamboo fiber or Kenaf fiber.
  • substrate 150 is a blend of cotton and linen fibers, such as used for U.S. banknotes.
  • substrate 150 may be made of a fiber blend which contains between 65-80% cotton fibers and between 20-35% linen fibers.
  • the relative proportions of cotton and linen fibers may be such that the substrate contains 65- 100% cotton fibers and between 0 to 35% linen fibers.
  • micro-optic systems which provide the same synthetic images as the system described with reference to FIG. 1, but omit both optical spacer 110, as well as plastic carrier substrates (such as described in U.S. Patent No. 10,890,692) for casting focusing elements or other structures of the lens-icon micro-optic system.
  • plastic carrier substrates such as described in U.S. Patent No. 10,890,692
  • certain embodiments according to this disclosure can provide improved harvesting resistance and reduced plastic use.
  • FIGS. 2A-2C illustrate examples of security documents with reduced plastic, single-sided micro-optic security devices according to various embodiments of this disclosure. For consistency and convenience of cross-reference, elements common to more than one of FIGS. 2A-2C are numbered similarly.
  • Examples of coatings which may be applied to form a coated surface on coated substrate 201 include, without limitation, coatings built on aqueous dispersions of polyurethane and cellulose ester-based coatings.
  • icon layer 205 comprises a layer of cured polymeric “goo.”
  • “goo” encompasses the term of art within the field of banknote and security manufacture to refer to light-curable polymers (for example, polyacrylates) and embossable resins (for example, cast-curing resins manufactured by Crane Corporation or Giesecke and Devrient, GmbH) with sufficient viscosity to fill micron- scale relief structures of embossing molds when uncured, and sufficient strength to withstand removal from the embossing mold after curing and use in security documents.
  • light-curable polymers for example, polyacrylates
  • embossable resins for example, cast-curing resins manufactured by Crane Corporation or Giesecke and Devrient, GmbH
  • icon layer 205 is formed by first applying a layer of uncured goo to a coated top surface of coated substrate 201, pressing an embossing tool defining retaining structures (for example, mesas, voids and posts to be filled or covered with pigmented icon material) of icon layer 205 onto the uncured goo layer, and then passing curing light (for example, UV light) through the backside of coated substrate 201 to cross-link and cure the goo.
  • curing light for example, UV light
  • coated substrate 201 is a fibrous (i.e., paper) substrate to which a coating agent has been applied
  • the surface of coated substrate 201 has greater “tooth” or adhesive properties, due to surface variations not present in extruded polymeric films.
  • directly porting manufacturing techniques used for manufacturing icon and lens structures on extruded polymeric films frequently results in tearing or damaging of retaining structures with sub-micron scale features, given the relative strength of the adhesive bond between the underside of icon layer 205 (which is anchored in the surface variations of coated substrate) and adhesion between the embossing tool. Accordingly, “goos” with less surface tension and weaker adhesive properties than are typically used when cast-curing features anchored to extruded polymer films need to be used.
  • a layer of polymeric icon material in a contrasting color (or clear, if the retaining structures are pigmented) to the retaining structures is applied on top of the retaining structures such that the retaining structures are “just barely” filled or coated, such that, when viewed from above, the icon layer comprises contrasting regions of retaining structure colored material and fill material.
  • applying the contrasting polymeric icon material comprises applying a flood coat on top of the retaining structures, and doctor blading excess material off to create contrasting regions of retaining structure and pigmented icon material. Having filled the retaining structures, the uncured contrasting material of the icon layer is cured. The curing light can be passed through the underside of coated substrate 201 or from a light source directly facing the retaining structures of icon layer 205.
  • attempting to form a smooth layer of uncured goo at a uniform thickness on an icon layer formed on a coated fibrous substrate is generally not possible.
  • a substantially uniform thickness differential between the focusing layers and icon layers of a security device which is “built up” on a single side of a fibrous substrate one or more textured adhesion layers (207 and 209) of varying thickness are applied on top of icon layer 205.
  • Textured adhesion layers 207 and 209 comprise cast-cured layers of a goo which has the same index of refraction as focusing layer 211.
  • each of first textured adhesion layer 207 and second textured adhesion layer 209 has an embossed relief pattern defining texture elements.
  • the textured elements of first adhesion layer 207 comprise hemispherical undulations, spaced at an element spacing 217. While texture elements comprise, hemispherical undulations are easy to form and can frequently spare manufacturers the expense of sourcing new embossing tools (molds for coarser pitch lenses can be used to create texture elements), there is no requirement that the texture elements of textured adhesion layers 207 and 209 be so shaped.
  • Other texture elements such as triangular ridges or square waves, are possible and within the contemplated scope of this disclosure.
  • Curing light for forming textured adhesion layers 207 and 209 can, as with icon layer 205, be provided from underneath (i.e., through coated substrate 201) or facing textured adhesion layers 207 and 209. Additionally, in certain embodiments, the embossing tool use to create textured adhesion layers 207 and 209 may be translucent or comprise a light source, to facilitate both casting and curing by a single tool.
  • a focusing layer 211 is formed on top of the top-most textured adhesion layer (in this example, second texture adhesion layer 209) by applying a layer of uncured goo on top of the top-most textured adhesion layer, embossing same with a tool defining a lens relief pattern, and curing same with ultraviolet light.
  • focusing layer 211 comprises an array of refractive lenses which are disposed at an element spacing 215.
  • element spacing encompasses lens pitch.
  • focusing layer 211 can be formed using the same goo as textured adhesion layers 207 and 209, thereby that each of these layers have a common refractive index.
  • FIG. 2B illustrates a second example of a security document 250 with a reduced-plastic singlesided micro-optic security feature according to various embodiments of this disclosure is shown.
  • Security document 250 builds on the example of security document 200 in FIG. 1 through the addition of a cast- cured polymeric seal layer disposed on top of focusing layer 211.
  • seal layer 220 is formed from a goo having a different index of refraction than the lenses of focusing layer 211. Where the lenses of focusing layer 211 are concave (as shown in FIG.
  • seal layer 220 is formed from a goo having a lower RI than that of focusing layer 211.
  • seal layer 220 is formed from a goo having a higher RI than that of focusing layer 211.
  • the RI of both seal layer 220 and focusing layer 211 can be tuned upwards by adding nanoparticles to the uncured goo used to form these elements.
  • FIG. 2C illustrates a third example of a security document 275 with a reduced-plastic singlesided micro-optic security feature according to various embodiments of this disclosure is shown. While FIGS. 2A and 2B described examples of micro-optic security devices with refractive lenses which were built upon an icon layer as the first layer added to coated substrate 201, the present disclosure is not limited to such embodiments. As shown with reference to FIG. 2C, embodiments according to this disclosure include embodiments with reflective focusing elements, and in which the icon layer does not comprise the bottom-most layer (i.e., closest to coated substrate 201).
  • first textured adhesion layer 207 is formed on coated substrate 201.
  • first textured adhesion layer is cast-cured by embossing polymeric goo to define the texture elements (which, in this example, have a smaller element spacing than focusing elements of focusing layer 211) and cured using UV light passed through coated substrate 201.
  • FIG. 2C illustrates that embodiments according to this disclosure do not require such a construction.
  • focusing layer 211 comprising a layer of concave, reflectively coated (with a metallizing coating) lenses is formed by cast-curing the concave forms of the focusing elements in the same manner as first textured adhesion layer 207, and then metallizing same (for example, through vapor deposition of a reflective metal, such as aluminum or chromium).
  • a second textured adhesion layer 209 can be applied on top of focusing layer 211.
  • polymers metallized by vapor deposition both reflect and permit the passage of light through the metallized surface (which is why reflective sunglasses are so made).
  • second textured adhesion layer 209 can, like the layers beneath it, be formed by embossing uncured goo on top of metallized focusing layer 211 and passing UV curing light up through coated substrate 201 to second textured adhesion layer 209.
  • an icon layer 205 can be formed on second textured adhesion layer 209.
  • icon layer 205 is formed by cast curing retaining structures defining the icon pattern, filling the retaining structures with pigmented icon material (for example, by doctor blading uncured tinted polymeric goo across the retaining structures), and then flood-curing same. Curing of the retaining structures and tinted icon material of icon layer 205 can be performed using light passed through coated substrate 201.
  • FIG. 3 illustrates operations of a method 300 for making security documents reduced-plastic single-sided micro-optic security features according to this disclosure.
  • FIGS. 2A-2C there is no requirement that the operations described with reference to FIG. 3 need to be performed in the order shown in the figure, and variations from the sequence shown in FIG. 3 to create different security document structures are within the contemplated scope of this disclosure.
  • a coated substrate having at least one coated surface (for example, coated substrate 201) is provided.
  • the coated substrate can be a dual sided coated substrate, where two opposite sides of the substrate are coated.
  • the coated substrate provided at operation 305 is a fibrous substrate, and at least one of the coated surfaces retains some of the texture and microscopic surface variation which distinguishes fibrous substrates not seen in extruded polymeric films at the same levels of microscopic magnification.
  • a layer of focusing elements (for example, focusing layer 211 in FIGS. 2A- 2C) is formed.
  • the focusing layer can be formed on top of the icon layer, or alternatively, can be formed on one or more textured adhesion layers disposed between the icon layer and focusing elements.
  • the focusing layer can, like the layer(s) below it, be produced by cast-curing uncured polymeric goos using UV light either presented directly to the uncured goo, or passed through the coated substrate.
  • micro-optic security device 100 comprises a focusing layer comprising a plurality of focusing elements 105 (including, for example, focusing element 107), and an arrangement of image icons 120 (including, for example, image icon 121.
  • focusing element of plurality of focusing elements 105 has a footprint, in which one or more image icons of arrangement of image icons 120 is positioned.
  • the focusing elements of plurality of focusing elements 105 magnify portions of image icons 120 to produce a magnification effect (also referred to as a “synthetically magnified image” or more briefly, a “synthetic image”) wherein the individually microscopic image icons are collectively magnified by the plurality of focusing elements 105 to produce an image which dynamically reacts (for example, by appearing to move, change shapes, or change colors) in response to shifts in viewing angle.
  • FIGURES 4A and 4B illustrate an example portion 402 of a security device in accordance with this disclosure.
  • the portion 402 of the security device can be a part of the micro-optic security device 100, and can include components of the micro-optic security device 100, such as focusing elements and image icons.
  • the portion 402 can be a thread of the micro-optic security device 100.
  • the portion 402 of the security device can, using the image icons, project various synthetic images within the footprints of the focusing elements.
  • various synthetic images 404 are visible.
  • the synthetic images can form a pattern of image types, or, in some embodiemnts, each image can be of a selected type, without following a certain pattern. In some embodiemnts, each image may be different. That is, it will be understood that the synthetic images 402 shown in FIGURES 4A and 4B are merely examples, and the synthetic images can take any visual shape, can be of any color or combination of colors, and can be in any position on the portion 402 of the security device. In this example, the synthetic images are a combination of three types of images: shields, locks, and mobile devices.
  • FIGURE 4A is the portion 402 of the security device at a first example viewing angle
  • FIGURE 4B is the portion 402 of the security device at a second example viewing angle.
  • the second viewing angle cause the synthetic images 404 to morph.
  • the shapes of the synthetic images 404 viewed in corresponding areas of the portion 402 appear to morph to other shapes.
  • a lock image viewed at the first viewing angle of FIGURE 4A may morph into a shield image when viewed at the second viewing angle of FIGURE 4B
  • a mobile device image viewed at the first viewing angle of FIGURE 4A may morph into a lock image when viewed at the second viewing angle of FIGURE 4B, and so on.
  • the perceived position and/or color of the synthetic images 402 may also change when the viewing angle changes.
  • Examples of security documents according to embodiments of this disclosure include security documents comprising a substrate having a first side, a coated surface disposed on the first side of the substrate, an icon layer disposed on the coated surface, the icon layer comprising a plurality of pigmented structures, a focusing layer comprising a plurality of focusing elements, wherein each focusing element of the plurality of focusing elements has a footprint, and wherein the plurality of focusing elements projects a synthetic image of portions of the icon layer in footprints of the plurality of focusing elements.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein the substrate includes a second side, and a second coated surface disposed on the second side of the substrate.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein none of the icon layer or the focusing layer comprise or contact a layer of extruded transparent or translucent polymer film.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein the substrate is a fibrous substrate.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein the fibrous substrate has a diffuse opacity of less than 85% when measured according to TAPPI standard T425.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein the fibrous substrate has a diffuse opacity of less than 70% when measured according to TAPPI standard T425.
  • Examples of security documents according to embodiments of this disclosure include security documents comprising a textured adhesion layer disposed between the icon layer and the focusing layer.
  • Examples of security documents according to embodiments of this disclosure include security documents, wherein the icon layer is a structured icon layer, comprising at one or more of mesas, posts, or voids of cured light-curable polymer.
  • micro-optic security devices comprising an icon layer, the icon layer comprising a plurality of pigmented structures, an adhesive layer disposed on the icon layer, and a focusing layer comprising a plurality of focusing elements, wherein each focusing element of the plurality of focusing elements has a footprint, wherein the plurality of focusing elements projects a synthetic image of portions of the icon layer in footprints of the plurality of focusing elements, and wherein none of the icon layer or focusing layer comprise or contact a layer of extruded transparent or translucent polymer fdm.
  • micro-optic security devices examples include micro-optic security devices comprising a textured adhesion layer disposed between the icon layer and the focusing layer.
  • micro-optic security devices include micro-optic security devices, wherein focusing elements of the plurality of focusing elements are refractive focusing elements.
  • micro-optic security devices include micro-optic security devices, wherein focusing elements of the plurality of focusing elements are reflective focusing elements.
  • micro-optic security devices include micro-optic security devices, wherein the focusing layer or a seal layer comprises a first exterior surface of the micro-optic security device, and the first exterior surface does not contact a carrier substrate.
  • micro-optic security devices include micro-optic security devices, wherein the adhesive layer has a diffuse opacity of less than 70% when measured according to TAPPI standard T425.
  • micro-optic security devices include micro-optic security devices, wherein the icon layer is a structured icon layer, comprising at one or more of mesas, posts, or voids of cured light-curable polymer.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods comprising on a substrate having a coated surface, forming an icon layer on the coated surface, and forming a focusing layer comprising a plurality of focusing elements, wherein each focusing element of the plurality of focusing elements has a footprint, and wherein the plurality of focusing elements projects a synthetic image of portions of the icon layer in footprints of the plurality of focusing elements.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods comprising subsequent to forming the icon layer and before forming the focusing layer, forming one or more textured adhesion layers.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods, wherein the one or more textured adhesion layers have a first element spacing, wherein focusing elements of the focusing layer are spaced at a second element spacing, and wherein the first element spacing is greater than the second element spacing.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods, wherein the icon layer is formed by applying a layer of uncured, light curable material to the coated surface, embossing the layer of uncured light curable material to define a plurality of relief structures within the icon layer, and curing the light curable material by passing light through the substrate.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods, wherein the substrate is a fibrous substrate.
  • Examples of methods of making security documents according to embodiments of this disclosure include methods, wherein the substrate has a diffuse opacity of less than 85% when measured according to TAPPI standard T425.

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Abstract

L'invention concerne un document de sécurité (160 200 250, 275) ou un dispositif (100) comprenant un substrat (150, 201) ayant un premier côté, une surface revêtue disposée sur le premier côté du substrat, une couche d'icône (120, 205) disposée sur la surface revêtue, la couche d'icône comprenant une pluralité de structures pigmentées et une couche de focalisation (211) comprenant une pluralité d'éléments de focalisation (105). Chaque élément de focalisation (121) de la pluralité d'éléments de focalisation a une empreinte, et la pluralité d'éléments de focalisation projette une image synthétique (402) de parties de la couche d'icône dans des empreintes de la pluralité d'éléments de focalisation.
PCT/US2025/019440 2024-03-11 2025-03-11 Dispositif de sécurité micro-optique simple face Pending WO2025193748A1 (fr)

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US202463563853P 2024-03-11 2024-03-11
US63/563,853 2024-03-11

Publications (1)

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WO2025193748A1 true WO2025193748A1 (fr) 2025-09-18

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