WO2019219237A1 - Élément de sécurité optiquement variable à zone de surface réfléchissante - Google Patents

Élément de sécurité optiquement variable à zone de surface réfléchissante Download PDF

Info

Publication number
WO2019219237A1
WO2019219237A1 PCT/EP2019/000147 EP2019000147W WO2019219237A1 WO 2019219237 A1 WO2019219237 A1 WO 2019219237A1 EP 2019000147 W EP2019000147 W EP 2019000147W WO 2019219237 A1 WO2019219237 A1 WO 2019219237A1
Authority
WO
WIPO (PCT)
Prior art keywords
facet
facets
reflective
security element
element according
Prior art date
Application number
PCT/EP2019/000147
Other languages
German (de)
English (en)
Inventor
Raphael DEHMEL
Christian Fuhse
Kai Herrmann SCHERER
Maik Rudolf Johann Scherer
Original Assignee
Giesecke+Devrient Currency Technology 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+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Priority to CN201980014503.5A priority Critical patent/CN111757812B/zh
Priority to EP19726572.1A priority patent/EP3793841B1/fr
Publication of WO2019219237A1 publication Critical patent/WO2019219237A1/fr

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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials

Definitions

  • the invention relates to an optically variable security element for securing valuables, comprising a support having a reflective surface area which contains a multiplicity of reflective subregions, each subarea having a plurality of identically oriented reflective facets.
  • Data carriers such as security or identification documents, or other objects of value, such as branded articles, are often provided with security elements for securing purposes, which permit a verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in the authentication of authenticity, since they can not be reproduced even with the most modern copying machines.
  • the security elements are equipped with optically variable elements which 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.
  • optically variable effects for example, motion effects, pump effects, depth effects, relief effects or flip-effects, which are realized with the aid of holograms, microlenses or micromirrors, are described.
  • Hologram-based optically variable elements are widely used, but their conspicuousness and recognizability are hampered by their relatively low brilliance and diffractive color splitting of the reflected light. In addition, because of their relatively easy manufacturability, they offer less protection against forgery than microlens sen or micromirror structures based security elements.
  • the implementation of the above-mentioned optically variable effects with the help of microlenses allows illumination-independent good visibility.
  • microlens structures usually require a large layer thickness of the security element.
  • microlens-based authenticity features also involves some technical challenges: in the motif layer under the lens layer, only a few micrometres motifs with high quality must be displayed, and both the lens layer and the motif layer must be produced with high grid fidelity become. In practice, only periodic patterns of symbols whose size is limited to a few millimeters can currently be generated. The representation of the symbols is often slightly distorted and blurred, which lowers the recognition value of the security element.
  • An attractive variant is therefore the implementation of optically variable effects with the help of micromirrors, which is technologically less complex and allows large-area and sharp subjects in flat security elements.
  • micromirrors which is technologically less complex and allows large-area and sharp subjects in flat security elements.
  • the brightness and brilliance of the micromirror structures are particularly important.
  • Micromirror arrangements are currently produced in security elements, for example, by subdividing a desired effect area into equal pixels of a size of, for example, 20 ⁇ m x 20 ⁇ m, assigning a mirror pitch to each pixel, thus determining in which way the micromirrors of the pixel should be tilted relative to a substrate plane, and that the pixels are then filled with wedge-shaped micro mirror rules of the respective mirror slope.
  • the micromirrors have usually a solid base, typically 10 gm x 10 pm.
  • An example of a similar design is described in document EP 2390 106 B1.
  • a disadvantage of such designs, however, is that the periodic arrangement of the micromirrors often leads to undesirable diffractive effects and colored light reflections that disturb the actually desired achromatic appearance of the micromirror arrangement.
  • Aperiodic arrangements of micromirrors are also known and described, for example, in document WO 2012/055505 A1.
  • diffractive effects are largely avoided; a larger number of micromirrors is usually required to fill a given surface area, resulting in a lower area ratio of smooth mirror surfaces to (in practice) rounded edge regions and thus to lower brilliance can lead.
  • the present invention seeks to provide an optically variable security element of the type mentioned, which avoids the disadvantages of the prior art, and in which in particular a high anti-counterfeiting security are associated with high brightness and brilliance.
  • the extent of the reflective surface area defines an xy plane and a z-axis perpendicular thereto.
  • the orientation of each facet relative to the xy plane is determined by the indication of its normalized normal vector, where the projection of the normal vector into the xy plane defines a tilt direction of the facet.
  • the length of a facet is its dimension in the direction of inclination, the width of a facet its dimension perpendicular to the inclination direction in the xy plane, and the height of a facet its dimension in the z-direction.
  • a facet arrangement is created which can produce a desired appearance of the surface area with high brightness and brilliance and yet is never periodic. Due to the lack of periodicity, the arrangement is more difficult to adjust and therefore has a high security against counterfeiting. At the same time disturbing diffractive effects and resulting colored light reflections are avoided, whereby a larger amount of light is available for the desired reflection.
  • the now proposed arrangement has the advantage that a small number of facets for filling a portion is required. Especially with shallow facet slopes, large contiguous areas with high brightness are created. In addition, mutual shading effects are minimized by the size of the chain decreasing in the direction of inclination.
  • the identically oriented facets are arranged at least in a subset of the subregions, in each case along their common seed inclination direction with a length and height that are about the same constant factor.
  • the constant factor can also be the same for all subregions of the subset mentioned.
  • the constant factor is between 0.6 and 0.95, preferably between 0.75 and 0.85.
  • the identically oriented facets are even arranged in all subareas in the manner mentioned.
  • the identically oriented facets are arranged at least in a subset of the subregions in each case along their common inclination direction with a height decreasing from facet to facet by a constant height difference.
  • the height difference D is constant for the entire subarea, but it may even be the same for all subareas of the subset mentioned.
  • said constant height difference is between 50 nm and 400 nm, preferably between 80 nm and 150 nm.
  • the identically oriented facets are arranged in all subregions in the manner mentioned.
  • the heights of the facets can be additionally varied by a small, in each case substantially randomly selected height variation, wherein the additional substantially random height variation is advantageously less than 5%, in particular less than 2% of the initial height before the height variation.
  • the length of the facet is then adjusted accordingly to keep the inclination angle constant.
  • the chosen formulation takes into account the fact that a random variation can also be realized for example by means of computer-generated "random numbers" which are strictly deterministic ,
  • the height of the facets of the reflective surface area preferably does not exceed a maximum height H max which is less than 20 ⁇ m, preferably 10 ⁇ m or less, particularly preferably 5 ⁇ m or less. This can be achieved, for example, by the fact that in each case the first facet of each subarea, which is at the rear in the direction of inclination, is formed with a height which is less than or equal to the maximum height.
  • the equally oriented facets advantageously adjoin one another directly along the common inclination direction.
  • the facets may be arranged in the direction of inclination also with a small distance in the x-y plane is.
  • the distance between the facets is advantageously less than 10%, in particular less than 5%, of the average length of the two adjoining facets.
  • the reflective subregions expediently have a length in the common direction of inclination of the facets of less than 300 ⁇ m, preferably less than 100 ⁇ m, particularly preferably between 20 ⁇ m and 100 ⁇ m.
  • the reflective subregions can be square, rectangular, but also with be formed of any outline.
  • at least some of the reflective subareas may be formed with an outline in the form of a motif, in particular in the form of characters or symbols.
  • the largest dimension of the partial regions in the plane is expediently below 300 gm, preferably below 100 gm, particularly preferably between 20 gm and 100 gm.
  • the width of the facets preferably each occupies the maximum available width of a partial area.
  • the facet shape advantageously follows the edge of the section, which can also run obliquely or curved.
  • eight or less, preferably five or less, in particular two, three or four facets are arranged in the reflective subregions along the common direction of inclination.
  • the reflective facets are advantageously oriented in such a way that the reflective area can be perceived by a viewer as a curved, in particular continuously curved surface, preferably as a surface curved in two spatial directions, in particular continuously curved. Furthermore, it is advantageously provided that the reflective facets are oriented in such a way that the reflective surface area produces a movement effect, pump effect, depth effect, relief effect and / or flip effect when tilting or rotating the security element.
  • the reflective facets have a metallic or semiconducting coating, a high refractive index coating or a coating with a color-shifting layer.
  • the color-shifting layer can in particular be designed as a thin-layer system or thin-film interference coating. to be. It can be z.
  • the lektharis material can, for. As ZnS, Si0 2 , T1O2, MgF 2 can be used.
  • the color-shifting layer can also be formed as an interference filter, thin semitransparent metal layer with selective transmission by plasma resonance effects, nanoparticles, etc.
  • the color-shifting layer can be realized as a diffractive relief structure or sub-wavelength gratings.
  • the reflective surface region may alternatively or additionally be provided with a liquid crystal coating, preferably with a full-area cholesteric liquid crystal coating.
  • the reflective facets represent substantially planar surface elements inclined against the x-y plane, the expression "essentially” taking account of the fact that in production, due to production, it is not possible to produce perfectly flat surface elements.
  • the facets of a subarea are all the same orientation, with small variations in the tilt angle of a few percent possible.
  • the inclination angles of a subregion are equal to less than 3%, preferably less than 2%, in particular less than 1%.
  • the invention also includes a data carrier with a security element of the type described.
  • the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, for a share, a bond, a certificate, a voucher, a check, a high-quality entrance ticket, but also to act as an identification card, such as a credit card, a bank card, a cash card, an authorization card, a personal ID card or a pass personalization page.
  • the invention further includes a method for producing a security element of the type described above, in which a carrier is provided and provided with a reflective surface region whose extent defines an xy plane and a z axis perpendicular thereto, the reflective surface region is formed with a multiplicity of reflective subareas and each subarea having a plurality of identically oriented reflective facets, an orientation of each facet relative to the xy plane being determined by the indication of its normalized normal vector, the projection of the normal vector into the xy plane
  • the direction of inclination of the facet is defined, the length of a facet is its dimension in the inclination direction, the width of a facet is its dimension perpendicular to the inclination direction in the xy plane, and the height of a facet is its dimension in the z-direction, and the identically oriented facets in the reflective subregions along their common inclination direction can be arranged with decreasing length and decreasing height.
  • FIG. 1 shows a schematic representation of a banknote with an optically variable security element according to the invention in the form of a glued transfer element
  • Fig. 2 is an illustration of the coming of the three-dimensional
  • FIG. 3 is a perspective view of a reflective portion filled with five facets lying behind one another, FIG.
  • Fig. 4 is an illustration of one of the facets of Fig. 3 in detail to
  • Fig. 5 in perspective view to be filled with facets
  • FIG. 6 shows a vertical plan view of the surface area and partial area of FIG. 5
  • FIG 7 shows the height profile of the relief structure given by the facets of the partial area in a side view from the direction VII of FIG. 6.
  • FIG. 1 shows a schematic representation of a banknote 10 with an optically variable security element 12 according to the invention in the form of a glued-on transfer element.
  • the invention is not limited to transfer elements and banknotes, but can be used with all types of security elements, such as labels on goods and packaging or in the security of documents, ID cards, passports, credit cards, health cards and like.
  • security elements designed as security threads or security strips may be considered.
  • the security element 12 shown in FIG. 1 is itself formed extremely flat with maximum height differences of about 10 gm, but still conveys to the viewer a clear three-dimensional impression of the depicted motif of a value 14 of high brightness and brilliance apparently bulged out of the plane of the banknote 10 ,
  • the security element 12 contains a reflective surface area 20 whose extension defines an x-y plane which here coincides with the surface of the banknote 10.
  • the z-axis is perpendicular to the x-y plane, so that the coordinate system formed by the three axes forms a legal system.
  • FIG. 2 illustrates the formation of the three-dimensional appearance of the security element 12, the reference numeral 40 representing the surface, which is perceived by the viewer when viewing the security element 12, curved in two spatial directions, for example the value 14 of FIG.
  • the carrier 22 of the security element 12 is not the perceived by the viewer curved surface 40 itself formed, but rather a relief structure 24 having a plurality of small reflective portions 30, of which in the detail of Fig. 2 four portions 30-1 to 30-4 are shown.
  • the partial regions 30 each have a plurality of reflective facets 32, which are each formed with the same orientation within a partial region 30.
  • FIG. 3 shows a perspective view of a reflective subregion 30 which is filled with five successive facets 32-1 to 32-5.
  • the facets 32-1 to 32-5 represent substantially planar surface elements inclined against the xy plane.
  • one of the facets 32 of Fig. 3 is shown in more detail to define the definition of the orientation and size of the facets To illustrate sizes.
  • n ⁇ 1 and positive z-component determined.
  • the projection of the normal vector n into the xy plane of the surface area 20 defines an inclination direction r in the xy plane.
  • the direction of inclination r represents a vector lying in the xy plane, the direction of which indicates the direction in which perpendicularly incident light is reflected by the facet 32. If the normal If the gate n should be located perpendicular to the xy plane in a subregion, the direction of inclination of this subregion can be selected arbitrarily in the xy plane for the construction explained below.
  • the dimensions of the facets 32 are now defined in each case with respect to their inclination direction r, as illustrated in FIG. 4.
  • the length L of a facet 32 is its dimension in the direction of inclination, the width B of a facet its dimension perpendicular to the direction of inclination in the x-y plane, and the fleas of a facet its dimension in the z-direction.
  • the facets 32 of the area 20 in order to simulate the reflection behavior of the curved surface 40 are oriented in each subarea 30 in such a way that their normal vectors lie there beyond the extent of the subarea 30 average local normal vector N corresponds to the curved surface 40.
  • the subregions 30 are designed with a square outline, but in general they can also have any other contours, as illustrated below in the exemplary embodiment of FIGS. 5 to 7.
  • the edge length K or the maximum dimension of the subareas 30 in the x-y plane is below 300 gm and is in particular in the range from 20 gm to 100 gm.
  • Length L and width B of the facets 32 are above 3 gm, preferably above 5 gm, and the height of the facets is between 0 and 10 gm, preferably between 0 and 5 gm, so that the entire reflective surface is chen Schemes height differences of up to 10 mm, which are imperceptible to the naked eye.
  • the geometric reflection condition "angle of incidence equal failure angle" for the reflection of directed light 42 (FIG. 2) depends only on the local orientation of the normal vector of the reflective surface 40, 24 and the subregions 30 are also very small and thus Even if they do not appear, the reflective area 20 with the relief structure 24 exhibits substantially the same reflection properties as the three-dimensional area 40 to be imitated and therefore produces the pronounced three-dimensional impression of the imitated area 40 in the viewer despite its small height differences.
  • the peculiarity of the present invention consists in the particularly clever arrangement of the facets 32 in the subregions 30, which leads to a high brightness and brilliance of the surface region 20.
  • the inclination direction r projected into the xy plane is the same for all facets 32 of a subarea 30, so that in each subarea of one common tilt direction of the facets can be spoken.
  • the like oriented facets 32 and 32-1 to 32-5 are disposed in the reflective portions 30 along their common inclination direction r with decreasing height H and decreasing length L.
  • the sum of the lengths Li to Ls corresponds to the edge length K of the portion 30.
  • the width of the Facet th 32-1 to 32-5 is constant in the embodiment and corresponds to the edge width K of the square portion 30th
  • FIG. 5 shows a perspective view of a partial region 30 to be filled with facets 32 within a reflective surface region 20.
  • the normal normal vector N of the arched surface 40 to be represented results from the normalized normal vector desired for the partial region 30. From this one obtains by projection into the xy-plane the common inclination direction r for all facets of the sub-region 30.
  • the angle between the vectors n and r is the complementary angle to the inclination angle a of the facets, thus complements this 90 °.
  • the facets 32 are now to be arranged along a straight line 50 in the direction of inclination r from back to front with decreasing height and decreasing length.
  • the terms 'back' and 'front' refer to the direction of the vector r and are therefore always clearly defined.
  • Fig. 6 which shows the surface portion 20 with the portion 30 in senkrech ter supervision
  • two tangents 52 are initially applied to the contour 34 of the portion 30, which are perpendicular to the straight line 50 and whose distance is the length L.
  • £ 0.8.
  • a rectangle is filled with the scaled facets 32-1 to 32-5, which is defined by the two already mentioned tangents 52 and by two tangents 54 to the partial region 30 parallel to the straight line 50.
  • the facets are then limited to the interior of the portion 30 be, so that only the portion 30, but this is completely filled with the be written facets.
  • the facets 32-1 to 32-5 for illustration from behind (top left in Fig. 6) to the front (bottom right in Fig. 6) are shown alternately hatched.
  • Fig. 7 is a side view of the portion 30 from VII direction of Fig. 6, ie in the direction of inclination r and along the Ge straight 50 of FIG 6 shows. Also drawn in is the normalized normal vector n of the subregion 30, which represents the starting point for the construction of the facets 32-1 to 32-5.
  • the facets in the surface of the carrier are formed such that the lowest points or the minimum height values of all facets lie in a plane (parallel to the xy plane) (the Facets 32-1 to 32-5 represent substantially planar surface elements inclined to the xy plane).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

L'invention concerne un élément de sécurité (12) optiquement variable pour la protection d'objets de valeur, pourvu d'un support (22) pourvu d'une zone de surface (20) réfléchissante dont l'extension définit un plan (x-y) et un axe (z) qui lui est perpendiculaire, la zone de surface (20) réfléchissante contenant une pluralité de zones partielles (30) réfléchissantes et chaque zone partielle (30) comportant des facettes (32) réfléchissantes orientées dans le même sens, et une orientation de chaque facette (32) par rapport au plan (x-y) étant déterminée par l'indication de son vecteur normal (n) normalisé, la projection du vecteur normal dans le plan (x-y) définissant une direction d'inclinaison (r) de la facette, la longueur (L) d'une facette représentant sa dimension dans la direction d'inclinaison, la largeur (B) d'une facette représentant sa dimension perpendiculairement à la direction d'inclinaison dans le plan (x-y), et la hauteur (H) d'une facette représentant sa dimension dans la direction (z). Selon l'invention, les facettes orientées dans le même sens (32) le long de leur direction d'inclinaison (r) commune sont agencées dans les zones partielles (30) réfléchies par longueur (L) décroissante et par hauteur (H) décroissante.
PCT/EP2019/000147 2018-05-18 2019-05-16 Élément de sécurité optiquement variable à zone de surface réfléchissante WO2019219237A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980014503.5A CN111757812B (zh) 2018-05-18 2019-05-16 带反射的面区的光学可变的安全元件
EP19726572.1A EP3793841B1 (fr) 2018-05-18 2019-05-16 Élément de sécurité optiquement variable à zone de surface réfléchissante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018004052.7A DE102018004052A1 (de) 2018-05-18 2018-05-18 Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102018004052.7 2018-05-18

Publications (1)

Publication Number Publication Date
WO2019219237A1 true WO2019219237A1 (fr) 2019-11-21

Family

ID=66655292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/000147 WO2019219237A1 (fr) 2018-05-18 2019-05-16 Élément de sécurité optiquement variable à zone de surface réfléchissante

Country Status (4)

Country Link
EP (1) EP3793841B1 (fr)
CN (1) CN111757812B (fr)
DE (1) DE102018004052A1 (fr)
WO (1) WO2019219237A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113050206A (zh) * 2019-12-28 2021-06-29 惠州市华阳光学技术有限公司 光致变色材料
CN113773670A (zh) * 2020-06-09 2021-12-10 惠州市华阳光学技术有限公司 一种光致变色颜料及其制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390106A2 (fr) 2000-06-28 2011-11-30 De La Rue International Limited Dispositif de sécurité optiquement variable avec une structure en relief et un filtre réfléchissant à couche mince
WO2012055505A1 (fr) 2010-10-26 2012-05-03 Giesecke & Devrient Gmbh Élément de sécurité comportant un motif de surface optiquement variable
WO2015107347A1 (fr) * 2014-01-20 2015-07-23 De La Rue International Limited Elements de securite et leurs procedes de fabrication
FR3019497A1 (fr) * 2014-04-07 2015-10-09 Hologram Ind Composant optique de securite a effet reflectif, fabrication d'un tel composant et document securise equipe d'un tel composant
EP3000614A1 (fr) * 2014-09-23 2016-03-30 Giesecke & Devrient GmbH Élément de sécurité optique variable ayant une zone de surface réfléchissante

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056934A1 (de) * 2009-12-04 2011-06-09 Giesecke & Devrient Gmbh Sicherheitselement, Wertdokument mit einem solchen Sicherheitselement sowie Herstellungsverfahren eines Sicherheitselementes
DE102013002137A1 (de) * 2013-02-07 2014-08-07 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
DE102014014079A1 (de) * 2014-09-23 2016-03-24 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
KR102630381B1 (ko) * 2015-07-13 2024-01-29 웨이브프론트 테크놀로지, 인코퍼레이티드 광학 제품, 광학 제품을 제작하기 위한 마스터, 그리고 마스터 및 광학 제품을 제조하기 위한 방법
EP3970984A1 (fr) * 2016-07-25 2022-03-23 Toppan Printing Co., Ltd. Corps d'affichage
JPWO2018025999A1 (ja) * 2016-08-05 2019-06-27 凸版印刷株式会社 表示体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390106A2 (fr) 2000-06-28 2011-11-30 De La Rue International Limited Dispositif de sécurité optiquement variable avec une structure en relief et un filtre réfléchissant à couche mince
WO2012055505A1 (fr) 2010-10-26 2012-05-03 Giesecke & Devrient Gmbh Élément de sécurité comportant un motif de surface optiquement variable
WO2015107347A1 (fr) * 2014-01-20 2015-07-23 De La Rue International Limited Elements de securite et leurs procedes de fabrication
FR3019497A1 (fr) * 2014-04-07 2015-10-09 Hologram Ind Composant optique de securite a effet reflectif, fabrication d'un tel composant et document securise equipe d'un tel composant
EP3000614A1 (fr) * 2014-09-23 2016-03-30 Giesecke & Devrient GmbH Élément de sécurité optique variable ayant une zone de surface réfléchissante

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113050206A (zh) * 2019-12-28 2021-06-29 惠州市华阳光学技术有限公司 光致变色材料
CN113773670A (zh) * 2020-06-09 2021-12-10 惠州市华阳光学技术有限公司 一种光致变色颜料及其制备方法

Also Published As

Publication number Publication date
EP3793841B1 (fr) 2023-07-12
EP3793841A1 (fr) 2021-03-24
CN111757812A (zh) 2020-10-09
CN111757812B (zh) 2022-08-09
DE102018004052A1 (de) 2019-11-21

Similar Documents

Publication Publication Date Title
EP3294566B1 (fr) Élément de sécurité optiquement variable
EP3216620B1 (fr) Élement de securite, document de valeur dote d'un tel element de securite ainsi que procede de fabrication d'un element de securite
EP1966769B2 (fr) Elément de sécurité à variation d'aspect et son procédé de fabrication
EP1979768B1 (fr) Corps multicouches dote d'un systeme de microlentilles
EP2633344B1 (fr) Motif de surface modifiable d'un point de vue optique
DE10129939B4 (de) Optisch variables Flächenmuster
EP3000613B1 (fr) Élément de sécurité optique variable ayant une zone de surface réfléchissante
DE102018005447A1 (de) Optisch variables Sicherheitselement mit reflektivem Flächenbereich
EP2853411B1 (fr) Élément de sécurité avec image lenticulaire
EP2126615B1 (fr) Image de réseau de diffraction
EP2633346B1 (fr) Motif de surface modifiable d'un point de vue optique
DE102015005911A1 (de) Optisch variables Sicherheitselement
EP3621819A1 (fr) Élément de sécurité comprenant un ensemble de micro-miroirs permettant de produire un effet optiquement variable et procédé de fabrication de l'élément de sécurité
EP2782765B1 (fr) Dispositif de sécurité
WO2019219239A1 (fr) Élément de sécurité à microréflecteurs
WO2019219237A1 (fr) Élément de sécurité optiquement variable à zone de surface réfléchissante
EP2979893B1 (fr) Élement de securite optique variable et son procede de fabrication
EP3332278B1 (fr) Élément de sécurité
EP3406458A1 (fr) Élément de sécurité à zone de surface réfléchissante
DE102017006421A1 (de) Optisch variable Sicherheitsanordnung
EP4086084A1 (fr) Élément de sécurité optiquement variable et document de valeur pourvu de l'élément de sécurité optiquement variable
DE102021001899A1 (de) Optisch variables sicherheitselement und wertdokument mit dem optisch variablen sicherheitselement
DE102021001898A1 (de) Optisch variables sicherheitselement und wertdokument mit dem optisch variablen sicherheitselement
DE102021002335A1 (de) Optisch variables sicherheitselement und wertdokument mit dem optisch variablen sicherheitselement
DE102020000031A1 (de) Optisch variables Sicherheitselement

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19726572

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2019726572

Country of ref document: EP

Effective date: 20201218