EP3000614A1 - Élément de sécurité optique variable ayant une zone de surface réfléchissante - Google Patents

Élément de sécurité optique variable ayant une zone de surface réfléchissante Download PDF

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Publication number
EP3000614A1
EP3000614A1 EP15002684.7A EP15002684A EP3000614A1 EP 3000614 A1 EP3000614 A1 EP 3000614A1 EP 15002684 A EP15002684 A EP 15002684A EP 3000614 A1 EP3000614 A1 EP 3000614A1
Authority
EP
European Patent Office
Prior art keywords
facets
reflective
security element
grating
element according
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.)
Granted
Application number
EP15002684.7A
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German (de)
English (en)
Other versions
EP3000614B1 (fr
Inventor
Maik Rudolf Johann Scherer
Christian Fuhse
Michael Rahm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke+Devrient GmbH
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Filing date
Publication date
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Publication of EP3000614A1 publication Critical patent/EP3000614A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F7/00—Designs imitating three-dimensional [3D] effects
    • 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
    • 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

Definitions

  • the invention relates to an optically variable security element for safeguarding valuables, having a carrier with a reflective surface area whose extent defines an x-y plane and a z axis perpendicular thereto.
  • the invention also relates to a method for producing such a security element as well as a correspondingly equipped data carrier.
  • Data carriers such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are thereby equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • a technique widely used in the field of security elements which gives a practically flat film a three-dimensional appearance, are various forms of holography.
  • these techniques have some disadvantages for use with security features, in particular banknotes.
  • the quality of the three-dimensional representation of a hologram depends strongly on the lighting conditions. Especially with diffuse lighting, the representations of holograms are often difficult to recognize.
  • the present invention seeks to provide an optically variable security element of the type mentioned above, which avoids the disadvantages of the prior art, and in particular to provide a security element, despite flat design, a visually attractive three-dimensional appearance with high attention and Recognition value has.
  • the security element despite extremely flat design with a maximum height difference of, for example, only 10 microns produce a clear three-dimensional impression of the subjects shown.
  • the special coordination of the orientation of the facets and the diffractive grating pattern formed on the facets allows the dispersion of the light in ground transparent materials, such as glass or diamond, to be reproduced convincingly, as explained in detail below.
  • the grating vector of a grating pattern is a vector which is perpendicular to the grating lines and whose magnitude indicates the grating period.
  • the reflective pixels preferably each contain two or more equally oriented facets, but it is also possible that a portion of the pixels or all pixels each contain only one facet. At least a part of the pixels and / or the facets is advantageously formed with an outline in the form of a motif, in particular in the form of characters or symbols. The particular outlines may be used as an additional authentication feature that will only be visible under magnification. Furthermore, a microtext may additionally be inscribed in a part of the pixels or facets. The microtext can be written both on the facets or instead of some of the facets on the carrier.
  • the facets lying parallel to the xy plane at least one part with a diffractive grid pattern of a plurality of grid lines whose grid vector is substantially parallel to the grid vectors of the grid patterns of adjacent facets.
  • This requirement takes account of the fact that the above-mentioned condition on the lattice vector can not be applied to facets lying parallel to the xy plane since the cross product of the unit vector in the z direction then disappears with the normal vector.
  • the facets lying parallel to the xy plane are therefore advantageously provided with a grid pattern whose grid vector lies substantially parallel to the grid vectors of the grid patterns of adjacent facets.
  • the grating vector of such a facet may be chosen as the average of the grating vectors of the adjacent facets with a valid grating vector.
  • the reflective facets are advantageously oriented so that the reflective area can be perceived by a viewer as a curved, in particular continuously curved, surface.
  • the reflective area can be perceived as an arched in two spatial directions, in particular continuously curved surface.
  • the grating patterns of the reflective facets advantageously produce colored reflections in the first and possibly higher diffraction orders, which are perceptible to a viewer as a dispersion of a transparent material, such as glass or diamond.
  • the inclination of the reflective facets against the xy plane preferably has no dominant preferred direction, so that there is no plane perpendicular to the xy plane in which more than 80% of the normal vectors of the reflective facet lie.
  • the grid lines of all of the facets provided with a diffractive grid pattern have a grid vector parallel to the cross product of the unit vector in the z direction with the normal vector of the respective facet.
  • the diffractive grating patterns advantageously have a grating period between 0.3 ⁇ m and 4 ⁇ m, preferably between 0.6 ⁇ m and 3 ⁇ m.
  • all grid patterns of the area area have the same grid period.
  • the grating period of individual facets can be chosen differently, whereby the strength of the imitated dispersion can be varied.
  • the facets are preferably formed essentially as planar surface elements.
  • the wording "substantially” takes into account the fact that in practice production-related can not produce perfectly flat surface elements.
  • the facets can also be formed as curved, in particular concave, convex or corrugated surface elements.
  • the reflective facets are arranged in a periodic grid and in particular form a sawtooth grid.
  • the reflective facets are arranged aperiodically, with a Aperiodic arrangement of the facets is currently preferred, as this unwanted diffraction effects, resulting from a regular arrangements of the facets, can be avoided.
  • Another possibility to suppress unwanted diffraction effects is to aperiodically offset the facets in their height above the surface area.
  • an aperiodic displacement of the facets there is no simple, regular relationship between the heights of adjacent facets, so that constructive interference of the light reflected at neighboring facets and thus the emergence of a superimposed diffraction pattern are reliably prevented. Details of such aperiodic displacement of the document WO 2012/055506 A1 are removed, the disclosure content of which is included in the present application in this respect.
  • the facets advantageously have a dimension of 10 ⁇ m or more, preferably 20 ⁇ m or more, particularly preferably 30 ⁇ m or more, in the direction of the grating vector of the grating pattern.
  • the facets advantageously have a dimension between 5 ⁇ m and 30 ⁇ m, preferably between 7.5 ⁇ m and 15 ⁇ m, and the height of the facets is advantageously between 0 and 10 ⁇ m, preferably between 0 and 5 ⁇ m.
  • the reflective facets have a metallic coating, a high-index coating, or a coating with a color-shifting layer.
  • a part of the facets is formed without a diffractive grid pattern. Due to the proportion of lattice-free facets, the degree of the imitated dispersion can be adjusted.
  • the described reflective surface area can be combined with other security features, for example with holograms, in particular true color holograms, with subwavelength gratings or other subwavelength structures, with micromirror arrangements without diffractive gratings, or also with security features based on specific material properties, such as electrical conductivity, magnetic properties, luminescence, fluorescence or the like.
  • the other security features may for example be provided in gaps of the reflective surface area and be nested therewith.
  • 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, a share, a bond, a certificate, a coupon , a check, a high-quality entrance ticket, but also an ID card, such as a credit card, a bank card, a cash card, an authorization card, an identity card or a pass personalization page.
  • the reflective facets can be written into a photoresist together with the diffractive grating patterns, for example by means of gray scale lithography, subsequently developed, galvanically formed, embossed and mirrored in a UV varnish.
  • the mirror coating can be realized for example by an applied, for example vapor-deposited metal layer. Typically, an aluminum layer with a thickness of, for example, 50 nm is applied. Of course, other metals such as silver, copper, chromium, iron, nickel or alloys thereof may also be used. Also, as an alternative to metals, semiconductors such as silicon, high-index coatings, for example made of ZnS, Al 2 O 3 or TiO 2 , or also color-shifting layers can be applied. The application, in particular vapor deposition can be carried out over the entire surface, but it is also possible to perform a coating only in regions or grid-shaped, so that the security element is partially transparent or translucent.
  • 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 transfer element. It is understood, however, that the invention is not limited to transfer elements and banknotes but can be used in 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 the like. For banknotes and similar documents, in addition to transfer elements, for example, security threads or security strips may also be considered.
  • Fig. 1 shown security element 12 is itself extremely flat with maximum height differences of about 10 microns formed, but conveys the viewer a clear three-dimensional impression of the subjects shown, for example, the brilliant 14 and from the plane of the banknote 10 seemingly arched outstanding value 16.
  • the security element 12 therefore has a high value and also a high attention and recognition value.
  • the optically variable security element 12 contains a reflective surface area 20 whose extent 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 shows a detail of the reflective surface area 20 with three pixels 30 along a contour line 44 of the curved surface 40 and Fig. 4 shows a perspective view of a single facet 32 with its grid pattern 34.
  • 1 and positive z-component determined.
  • the azimuth angle of a facet is the angle between the projection of the normal vector n into the xy plane and a predetermined reference direction R (FIG. Fig. 3 ).
  • the facets 32 are each oriented such that their normal vector n corresponds to the local normal vector N of the curved surface 40 averaged over the extent of a pixel 30.
  • the pixels 30 are formed with a square outline, but they can generally also have other outline shapes, in particular a motif shape, such as characters or symbols.
  • the edge length of the pixels 30 is below 300 ⁇ m and is in particular in the range from 20 ⁇ m to 100 ⁇ m.
  • Length and width of the facets 32 are above 5 microns to avoid color splits by the facet assembly itself.
  • the height of the facets is only between 0 and 10 .mu.m, preferably between 0 and 5 .mu.m, so that the entire reflective area 20 has height differences of at most 10 .mu.m, which are imperceptible to the naked eye.
  • the reflective surface area shows 20 essentially the same reflection properties as the three-dimensional surface 40 to be imitated, and therefore produces the pronounced three-dimensional impression of the imitated surface 40 in the viewer despite its small height differences.
  • the reflective facets 32 are overall oriented in such a way that the reflective area 20 can be perceived by a viewer as an area 40 that protrudes and / or recesses relative to its actual spatial form.
  • the actual spatial form of the reflective surface area 20 is given by the sequence of the inclined facets, in the exemplary embodiment approximately by the regular sawtooth arrangement of the facets 32. Because of the generality of the construction described, the reflective area 20 can be used to generate virtually any three-dimensionally perceptible motifs, such as portraits, representations of objects, animals or plants, or spatial representations of alphanumeric characters, for example the "50" value Fig. 1 ,
  • the reflective facets 32 of the surface region 20 are additionally provided with diffractive grating patterns 34, each consisting of a plurality of parallel grid lines 36.
  • the orientation of the grating lines 36 is chosen so that the grating vector g of the grating pattern 34, which by definition is perpendicular to the grating lines 36 and whose magnitude indicates the grating period, parallel to the cross product of the unit vector e z in the z direction the normal vector n of the respective facet lies.
  • FIG. 3 shows in plan view three pixels 30 each having three facets 32, which along a contour line 44 of the curved surface 40 of Fig. 2 Therefore, they essentially do not differ in the inclination ⁇ of the facets against the xy plane, but only in the azimuth angle A of the facets.
  • the projection of the normal vector n into the xy plane, the reference direction R and the azimuth angle A are shown in each case for the pixels 30.
  • FIG. 3 also shows the resulting grating vector g and the associated grating lines 36 of the grating pattern 34.
  • the grating lines 36 are drawn only in one of the three facets 32 of each of the pixels 30.
  • the facets 32 of a pixel 30 are all the same orientation, the other facets of the pixel 30 have the same normal vector n, and thus also the same grating vector g and thus also the same grating pattern 34.
  • larger facet heights can be largely avoided, especially in the case of micromirrors with the same mirror slope.
  • the lattice-free facet 32 acts as an achromatically reflecting micromirror which reflects incident light without color splitting according to the laws of geometrical optics. If, from a viewing direction lying in the plane spanned by the normal vector and the z-axis, the facet 32 meets the reflection condition "angle of incidence equal to the angle of reflection", the facet appears colorless bright, otherwise dark. Since the reflection condition is exactly fulfilled only for one tilt angle, an abrupt, discrete change in brightness results when tilting the reflective facet perpendicular to the plane mentioned.
  • the direction of the 0th diffraction order of the grating pattern occurs instead of the direction of the geometrically directionally reflected light beam.
  • the reflection condition "angle of incidence equal to the angle of reflection” is satisfied, the facet appears bright and colorless, though typically with somewhat less brightness than in the lattice-free case described above, because a portion of the light is diffracted in other spatial directions.
  • the propagation direction of the diffracted light is in a plane subtended by the lattice vector g and the direction of the 0th order of diffraction.
  • the angles ⁇ and ⁇ , respectively, are the angles of the incident or reflected light projected into the plane spanned by the grating vector g and the normal vector n .
  • the angle ⁇ is always taken positive, the angle ⁇ positive if it, as usual in the embodiments according to the invention, with respect to the lattice normal on the same side as ⁇ , otherwise negative.
  • the angles ⁇ and ⁇ of the grating equation do not change when tilting the reflective facet ⁇ m an axis perpendicular to said plane.
  • tilting also gradually changes the angles ⁇ and ⁇ in the grid equation. In the case of such tilting, therefore, a gradual change in color and / or intensity occurs, as a result of which, in particular, the color impression of the facet 32 changes continuously.
  • a reflective area 20 consisting of a plurality of facets 32 with different angles of inclination ⁇ and azimuth angles A
  • the totality of the facets does not have an excellent tilting axis. Rather, every tilt is at an arbitrary A part of the facets 32 show a discrete intensity change, while another part shows a gradual change in color and / or intensity.
  • the colorless and high-intensity reflections in the 0th diffraction order contribute in particular to the impression of a three-dimensional curved surface 40, since they adjust the reflection by the curved surface 40.
  • the colored reflections of the first and higher orders of diffraction additionally suggest to the viewer the occurrence of dispersion familiar to him from ground transparent objects.
  • the colored reflections of adjacent pixels 30 are not independent of each other, since the orientations of the facets 32 adjacent pixels are not independent of each other, but are just chosen so that the pixels 30 in their entirety just the reflection behavior of reproduce three-dimensional surface 40. With the spatial orientation, therefore, the colored reflections of adjacent pixels 30 are correlated and lead to macroscopically recognizable colored reflections, which, as the inventors have surprisingly found, mimic the occurrence of dispersion in transparent materials.
  • the facets lying parallel to the xy plane are therefore advantageously provided with a grid pattern whose grid vector lies substantially parallel to the grid vectors of the grid patterns of adjacent facets.
  • the above condition applies to the grating vector g only its direction, but not its magnitude. Rather, can be adjusted by the choice of the grating period, regardless of the previous considerations, the degree of the imitated dispersion. Smaller grating periods lead to a more pronounced spatial fanning of the light into spectral colors and thus to colored reflections of lesser intensity. Thus, after determining the direction of the grating vector, the grating period is selected according to the magnitude of the desired dispersive appearance of the curved surface 40.
  • Another way to adjust the degree of mimic dispersion is to form a certain part of the facets without lattice patterns and to reduce the degree of mimic dispersion by the proportion of lattice-free facets.
  • the reflective pixels 30 and the reflective facets 32 can, as in Fig. 3 shown, arranged in a regular grid and form, for example, a regular Blazegitter.
  • the surface areas according to the invention are not limited to regular pixel or facet arrangements, but rather even aperiodic pixel or facet arrangements are used, as this unwanted diffraction effects, such as may occur through regular arrangements are avoided.
  • FIG. 5 shows an embodiment in which, for ease of illustration, each pixel 30 consists of only one facet 32 and in which the pixels or facets are arranged aperiodically in the xy plane.
  • the dimension of the facets in the direction of the grating vector g of the grating pattern 34 is at least 10 ⁇ m, preferably at least 20 ⁇ m, particularly preferably at least 30 ⁇ m.
  • the dimension of the facets is in each case between 5 ⁇ m and 30 ⁇ m, preferably between 7.5 ⁇ m and 15 ⁇ m.
  • the height of the facets is between 0 and 10 microns, preferably between 0 and 5 microns.
  • the boundary lines of the outline of the facets 32 and the pixels 30 are advantageously perpendicular to the grid lines 36 as far as possible. As a result, regardless of the orientation of the facets or pixels, a maximum number of grid lines 36 is available for the diffraction and thus for a brilliant appearance available. Also, larger facet heights can be largely avoided.
  • aperiodically offset the facets in their height above the surface area For example, shows Fig. 6 the reflective surface area 50 of a security element 12 in cross section, in which the facets shown in the cutout 52 all have the same inclination, but are offset in aperiodischer, in particular in an irregular manner by a height offset between zero and at least half a wavelength from its regular starting position.
  • the path differences between different facets 52-j, 52-k are changed in an irregular manner by a value between zero and at least one entire wavelength.
  • the light beams 54-j and 54-k reflected by the different facets 52-j, 52-k are then in a random phase relationship so that the array of facets 52 does not act as a diffractive structure, despite a periodic arrangement of equally aligned facets 52 and therefore no disturbing secondary diffraction effects occur.
  • FIG. 7 schematically illustrates the mirror reflexes and the dispersion effect occurring during tilting on the basis of the representation of the value 16 of FIG Fig. 1 .
  • the numerical value 16 appears with vaulted numerals 60 clearly protruding from the xy plane of the surface region 20.
  • the inner numerical regions appearing white in the figure represent bright mirror reflections 62, which convey to the observer the illusion of a surface curving towards him. This illusion is reinforced by the apparent movement of the mirror reflexes 62 when tilting about one of the tilting axes 70, 72.
  • the mirror reflections 62 when tilting about the horizontal tilt axis 70 in the figure move upwards or when tilting in the opposite direction down and behave so as well as the mirror reflections on the imitated three-dimensional surface.
  • the mirror reflexes 62 travel to the right about the tilting axis 72 perpendicular in the figure or to the left when tilting in the opposite direction, as in FIG Fig. 7 (c) shown and behave like the mirror reflexes on the imitated three-dimensional surface.
  • the grating patterns 34 of the facets 32 in the first and the higher diffraction orders produce colored reflections 64 FIGS. 7 (b) and 7 (c) illustrated, the colored reflections 64 are more pronounced due to the particular orientation of the grid pattern 34 when tilted about the horizontal tilt axis 70 in the vertical areas 66 of the mirror reflexes 62 and are more pronounced when tilted about the vertical tilt axis 72 in the horizontal areas 68 of the mirror reflections 62.
  • Such colored reflections 64 usually occur with polished transparent objects and therefore suggest to the viewer the presence of corresponding objects. By the appealing and spectacular visual impact increases the attention and recognition value and thus also the forgery security of the security element 12.

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EP15002684.7A 2014-09-23 2015-09-16 Élément de sécurité optique variable ayant une zone de surface réfléchissante Active EP3000614B1 (fr)

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DE102014014082.2A DE102014014082A1 (de) 2014-09-23 2014-09-23 Optisch variables Sicherheitselement mit reflektivem Flächenbereich

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EP3000614A1 true EP3000614A1 (fr) 2016-03-30
EP3000614B1 EP3000614B1 (fr) 2018-09-12

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019219237A1 (fr) * 2018-05-18 2019-11-21 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante
CN115230363A (zh) * 2021-04-25 2022-10-25 中钞特种防伪科技有限公司 光学防伪元件及其设计方法、防伪产品
CN115835966A (zh) * 2020-07-07 2023-03-21 捷德货币技术有限责任公司 光学可变的防伪元件
US11774650B2 (en) 2016-07-25 2023-10-03 Toppan Printing Co., Ltd. Display body
CN117355422A (zh) * 2021-05-18 2024-01-05 捷德货币技术有限责任公司 光学可变的显示元件
SE547547C2 (en) * 2020-02-12 2025-10-14 Ccl Secure Pty Ltd An optical effect device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017005050A1 (de) * 2017-05-26 2018-11-29 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit reflektivem Flächenbereich

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WO1997021121A1 (fr) * 1995-12-06 1997-06-12 De La Rue International Limited Structure diffractive
WO2012055506A1 (fr) 2010-10-26 2012-05-03 Giesecke & Devrient Gmbh Élément de sécurité comportant un motif de surface optiquement variable
DE102010049831A1 (de) * 2010-10-27 2012-05-03 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
AU2013101172B4 (en) * 2013-09-02 2014-04-17 Innovia Security Pty Ltd Multichannel optical device

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AU2002367080A1 (en) * 2002-01-18 2003-07-30 Ovd Kinegram Ag Diffractive security element having an integrated optical waveguide
JP4779792B2 (ja) * 2006-04-27 2011-09-28 凸版印刷株式会社 情報記録媒体、及び情報記録媒体の真偽判定装置
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WO1997021121A1 (fr) * 1995-12-06 1997-06-12 De La Rue International Limited Structure diffractive
WO2012055506A1 (fr) 2010-10-26 2012-05-03 Giesecke & Devrient Gmbh Élément de sécurité comportant un motif de surface optiquement variable
DE102010049831A1 (de) * 2010-10-27 2012-05-03 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
AU2013101172B4 (en) * 2013-09-02 2014-04-17 Innovia Security Pty Ltd Multichannel optical device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11774650B2 (en) 2016-07-25 2023-10-03 Toppan Printing Co., Ltd. Display body
EP3489936B2 (fr) † 2016-07-25 2025-08-13 Toppan Printing Co., Ltd. Corps d'affichage
WO2019219237A1 (fr) * 2018-05-18 2019-11-21 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante
SE547547C2 (en) * 2020-02-12 2025-10-14 Ccl Secure Pty Ltd An optical effect device
CN115835966A (zh) * 2020-07-07 2023-03-21 捷德货币技术有限责任公司 光学可变的防伪元件
CN115230363A (zh) * 2021-04-25 2022-10-25 中钞特种防伪科技有限公司 光学防伪元件及其设计方法、防伪产品
CN115230363B (zh) * 2021-04-25 2024-03-29 中钞特种防伪科技有限公司 光学防伪元件及其设计方法、防伪产品
CN117355422A (zh) * 2021-05-18 2024-01-05 捷德货币技术有限责任公司 光学可变的显示元件
CN117355422B (zh) * 2021-05-18 2026-04-14 捷德货币技术有限责任公司 光学可变的显示元件

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