EP3621819A1 - 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 - Google Patents

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

Info

Publication number
EP3621819A1
EP3621819A1 EP18725397.6A EP18725397A EP3621819A1 EP 3621819 A1 EP3621819 A1 EP 3621819A1 EP 18725397 A EP18725397 A EP 18725397A EP 3621819 A1 EP3621819 A1 EP 3621819A1
Authority
EP
European Patent Office
Prior art keywords
micromirror
micromirrors
motif
views
view
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
EP18725397.6A
Other languages
German (de)
English (en)
Inventor
Raphael DEHMEL
Christian Fuhse
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 and 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 and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3621819A1 publication Critical patent/EP3621819A1/fr
Pending legal-status Critical Current

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
    • B42D25/324—Reliefs

Definitions

  • the invention relates to a security element for a security paper, document of value or the like, wherein on a support in a distribution a plurality of micromirrors is arranged, each micro-mirror illuminates at a given illumination at a certain viewing angle, the orientation of the respective micro - mirror depends on a surface normal of the carrier, and the security element is a light / dark motif with a spatial resolution and as a movement effect for the subject shows different, depending on the viewing angle views of the subject by a subset of the micromirrors illuminated in each view, the Subsets are nested with respect to the location of their micromirrors in the distribution.
  • the invention further relates to a manufacturing method for the security element.
  • optically variable effects are known from the state of the art for security elements: motion effects, pump effects, depth effects, flip effects, etc., which are e.g. B. be realized with holograms, microlenses or micromirrors.
  • Hologram-based optically variable elements are widely used, but their conspicuousness and recognition are impaired by their relatively low brilliance and the diffractive color splitting of the reflected light. However, they also offer because of their relatively light weight Producibility a lower security against forgery as security elements based on microlenses or micromirrors.
  • RU 2430836 C1 which describes a generic security element.
  • the existing mirrors are subdivided into two groups of equal size and each represent a view of a motif Views are shown that from 10 to 20 discrete light spots, and realize a parallactic or ortho-parallactic motion effect.
  • This method would either have to reduce the range of motion of the light reflections or divide the existing mirrors into more than two groups.
  • the first variant would minimize the optical variability of the element and thus affect the security against counterfeiting.
  • the second variant would minimize the brilliance of the effect and therefore reduce the visibility of the security element.
  • the invention is therefore based on the object to provide a security element based on micromirror arrangements, which shows with higher brilliance and / or resolution with changes in the viewing angle, a sequence of arbitrary bright / dark views and thus realizes a movement effect.
  • the security element is designed to produce a security paper, value document or the like.
  • On a carrier a plurality of micromirrors is arranged in a certain distribution. Each micromirror illuminates at a given illumination at a given viewing angle. This viewing angle, at which a micromirror illuminates, depends on the orientation of the respective micromirror to a surface normal of the carrier.
  • the security element encodes a light / dark motif with a spatial resolution. It shows different motives depending on the viewing angle as a movement effect for the motif. In each view, only a subset of the micromirrors illuminates. The subsets of the micromirrors are nested with respect to the position of their micromirrors in the distribution.
  • the subsets are mathematically disjoint in pairs. They are therefore elementary, ie each micromirror is only present in exactly one subset. The sum of elements of all subsets is less than the number of views multiplied by a resolution parameter of the views.
  • the resolution parameter is the number of micromirrors that can be obtained from the spatial resolution for each view results. Thus, fewer micromirrors are used in the distribution than would be obtained with an I: 1-assigned nesting of the views.
  • the covering is such that a micromirror is only present in the first view at locations of the distribution in which a bright point lies in a first view and at the same time in a second view is a dark point is provided in a subset, but not for the second view.
  • a micromirror is only present in the first view at locations of the distribution in which a bright point lies in a first view and at the same time in a second view is a dark point is provided in a subset, but not for the second view.
  • each micromirror is less than 1 mm, is preferably below the perceptibility threshold of 300 ⁇ and very particularly preferably below 100 ⁇ .
  • the security element can be produced by a method which forms on a support a multiplicity of micromirrors, which are arranged in a distribution on the support.
  • the individual micromirrors illuminate at a viewing angle that depends on an orientation of the respective micromirror to a surface normal of the carrier.
  • Essential for the manufacturing process is the determination of the orientation.
  • a light / dark motif is predefined and, as a movement effect, views dependent on the viewing angle are defined for the motif.
  • motive points are selected from the motif, which lie in bright areas of the subject.
  • a sequence of substeps is performed for each selected motif point.
  • a virtual micro- created mirror assembly that specifies several virtual micromirrors. These are also arranged according to the distribution and in each case oriented such that the virtual micromirror arrangement for the motif point would produce the views dependent on the viewing angle. Subsequently, in a sub-step (bb), an area is selected from the virtual micromirror arrangement. After these sub-steps have been carried out for each selected motif point, ie preferably for all motif points that lie in bright areas of the motif, exactly one of the virtual micromirrors is selected for each micromirror provided in the distribution from the selected areas of all virtual micromirror arrangements. Its orientation is used for the realization of the micromirror at this location.
  • micromirrors are preferably selected which are bright micromirrors which are intended to produce a bright spot in one of the views.
  • Dark micromirrors on the other hand, are penalized because they are not located in motif spots that lie in bright areas of the views. Since a micromirror only shines brightly in one viewing angle due to the law of reflection and is dark in all others, the subject is in the views with high brilliance and
  • At least one of the following criteria may be used: orientation angle of the virtual micromirrors within a predetermined angular range, distance between virtual micromirror and motive point within a predetermined pitch range.
  • the selection of exactly one of the virtual micromirrors in step (c) may, in one embodiment, be iterative and use at least one of the following criteria: maintaining a predetermined local sequence of Views, uniform distribution of the number of micromirrors selected from each virtual micromirror arrangement, number of micromirrors per view.
  • a method is possible in which a light / dark motif and possible orientations of the micromirrors are specified for determining the alignment of the micromirrors in a step (a).
  • a view of the motif is defined in a step (b), the views being designed such that they form a movement effect dependent on the viewing angle for the motif.
  • the representation is virtually projected onto the entire area of the distribution of the micromirrors, and the following substeps are performed for each micromirror provided in the distribution: In a sub-step (ca) those views are selected that are at the location in the projection have a bright spot. Subsequently, (sub-step (cb)), one of the selected views is selected, and in a sub-step (cc), the micromirror is set to the orientation corresponding to the selected view as defined in step (b).
  • each view is assigned an equal number of micromirrors within a tolerance range of +/- 10%.
  • the views are iteratively distributed to the existing micromirrors so that the alignment of adjacent micromirrors within a similarity range of +/- 10% are the same.
  • the Views are iteratively distributed to the existing micromirrors such that the orientations of adjacent micromirrors deviate from one another by a predetermined amount, for example 70%.
  • the micromirror obtains a predetermined or (pseudo-) randomly selected orientation if the number of selected views for this micromirror falls below a certain value.
  • the invention further provides a security element produced according to one of the described production methods, as well as a value document with a security element according to the invention.
  • the security element enables continuous parallactic / ortho-parallactic movements of any motives. Above all, they have the opportunity for strong individualization. Detailed motifs are clearly visible, as it is possible to overlap movement areas without disturbing the brilliance.
  • the invention further provides micromirror patterns with pump, flip, rotation, morph, and explosion effects, as well as their combination with each other and with the above-mentioned translational effects.
  • the invention uses a novel method for the calculation of micromirror arrangements, with which any number of different light / dark representations with optimized light output are interlaced.
  • the security element has optically variable effects that were previously were known or previously could only be realized with significantly reduced brilliance / range of movement / attention to detail.
  • Particularly preferred embodiments are those in which the security element is formed by its micromirrors so that the subsets generate different motif elements or symbols, wherein at least two symbols or motif elements are provided which move parallactically and in the opposite direction during tilting.
  • a development is preferred in that one of the symbols or motif elements changes when tilted with regard to shape and / or size and / or position.
  • Items to be protected within the scope of this description may include, for example, security papers, identity and value documents (such as banknotes, chip cards, passports, cards, identification cards, identity cards, stocks, bonds, certificates, vouchers, checks, tickets, credit cards, health cards,. ..) and product safety elements, such.
  • security paper is understood to mean, in particular, the precursor to a value document (for example a card or banknote) that is not yet ready for circulation and that may also have further authenticity features.
  • value documents here on the one hand from security papers produced documents, eg. B. banknotes understood.
  • FIG. 1 shows a plan view of a banknote with a security element, different examples for the breakdown of a light / dark motif by motif points
  • FIG. 3 shows schematics for the geometric definition of a mirror alignment
  • Fig. 4 is a schematic representation for illustrating a
  • Figs. 5A-5D are schematic diagrams for explaining the determination of the mirror orientation
  • FIGS. 7A-7C are views for illustrating the determination of the orientations of micromirrors in a micromirror arrangement.
  • Fig. 1 shows schematically a banknote B with a security thread S, which is introduced into a banknote paper of the banknote B.
  • the security thread S has a carrier 6, on which a plurality of micromirrors 3 is arranged.
  • Each micromirror 3 is below a perceptibility size and has a flat mirror facet. It reflects light in a certain direction in accordance with the laws of reflection given a given illumination. When viewed from this direction, the micromirror 3 then appears as a bright spot.
  • the micromirrors 3 are arranged in a distribution 8 of locations 9 on the support 6, which corresponds for example to a rectangular grid. Non-Cartesian distributions and also non-rectangular mirror shapes are equally possible and known to the person skilled in the art.
  • the orientation of the micromirrors 3 (also abbreviated to "mirrors” in the following) is selected via the distribution 8 such that a viewer recognizes a motif whose appearance changes depending on the viewing angle, and sees it differently depending on the viewing angle View of the subject. As a result, a movement effect is realized. For this movement effect, it is important how the orientations of the micromirrors 3 in the distribution 8 are selected.
  • the distribution 8 ensures that micromirrors 3 which lie in areas which are dark in one view are provided with an orientation which produces a bright spot in another view and there too requires.
  • the number of micromirrors 3, which is fixedly predetermined in the distribution 8 can be utilized to a high level of light. For each view, this achieves a resolution which is higher than if one were to make a uniform subdivision into micromirrors 3 for each view, and this subdivision intervened in the distribution 8.
  • the orientation of the micromirrors 3 in the distribution 8 will be explained below with reference to two different motifs. Both times are light / dark motifs.
  • a dot motif 1 is defined, in the second embodiment a bright / dark bitmap.
  • a point motif 1 is created, which consists of any number of motif points 2 (typically: 50 to 3000).
  • the motif dots 2 are positioned so that they lie in the bright areas of the desired light / dark motif 1. They may, for example, be arranged along the contour of the motif 1 (eg of a symbol) or distributed over the surface of the motif 1 (in each case uniformly or randomly), as shown in FIG.
  • a separate virtual micromirror arrangement 15 is created for each of the motif points 2.
  • each individual micromirror arrangement 15 the orientations of the mirrors 3 are calculated in such a way that an observer would perceive a circular or elliptical light reflection, which moves in a certain way as the viewing angle changes and possibly deforms.
  • the mirror alignment can be quantified, for example, by using a Cartesian coordinate system 4 whose xy plane is parallel to the carrier plane below the mirrors 3.
  • Each mirror surface 16, as shown in FIG. 3, is assigned a normal vector whose projections in the xz plane and yz plane each enclose an angle with the z axis. These angles are designated by a x and a y and define the orientation of the respective mirror 3 clearly.
  • a parallactic motion of the reflex is realized when the angle ct x is chosen to be proportional to the difference of the x-coordinates of the center of the corresponding mirror 3 and the position of the motif point 2, while the angle a y is proportional to the difference of the y-coordinates of the center 2 of the corresponding mirror 3 and the position of the motif point 2 is selected.
  • the angle ct x is chosen to be proportional to the difference of the x-coordinates of the center of the corresponding mirror 3 and the position of the motif point 2 is selected.
  • the angle a y is proportional to the difference of the y-coordinates of the center 2 of the corresponding mirror 3 and the position of the motif point 2 is selected.
  • the mirrors 3 are rotated by an angle which is not an integer multiple of 90 °.
  • the "speed of movement" of the light reflection when changing the illumination and / or viewing angle is dependent on the proportionality constant of the relationship between the angles a x and a y and the respective coordinate differences: the smaller the alignment difference between adjacent mirrors, the smaller the change in the With the same change rate of the viewing angle, the light reflection thus moves faster if the alignment differences of adjacent mirrors 3 are smaller
  • the proportionality constants for the x-direction and y-direction do not have to be the same. With unequal values, distortions of the light reflections occur.
  • the light reflections can also perform non-linear movements, whereby the nonlinearity can refer here to the trajectory and / or the speed of the movement.
  • Nonlinear motion can be generated by translating a nonlinear relationship between the angles a x and a y and the coordinate differences described above.
  • an interleaving method is used to create the final mirror arrangement from the virtual mirror arrangements 15.
  • all micromirror arrangements 15 are projected onto the distribution 8, so that each location 9 of the final mirror distribution 8 is assigned a respective mirror 3 from each of the virtual micromirror arrangements 15.
  • the method can also be applied if each final location 9 has multiple virtual mirrors from each virtual array 15 or when a group of mirrors is assigned to the final distribution 8 one virtual mirror from each virtual arrangement 15, respectively.
  • all associated virtual mirrors from the virtual micromirror arrangements 15 are listed.
  • a preselection for a region 11 is made on the basis of predetermined criteria. Criteria for the pre-selection may be that values of the angles a x and a y of the virtual mirrors must each lie within a certain interval, or that the distance of the virtual mirrors to their respective motif point 10 must lie within a certain value range.
  • the criteria may also be linked to random or pseudo-random selection mechanisms (X% of the virtual mirrors meeting criterion 1, in pre-selection, Y% of the virtual mirrors meeting criterion 2, in preselection, etc.). From the preselection that provided multiple views 12, 13, a virtual mirror (or group of virtual mirrors that is the same size as the original group of mirrors from the final distribution 8) is then randomly or pseudorandomly selected. This selection can be carried out iteratively, for example, to ensure that locally determined sequences of alignments are kept, or that the number of selected mirrors from each virtual mirror arrangement is distributed as equally as possible, or that the number of mirrors 3 per alignment interval is as far as possible is distributed equally. In the representation of FIG. 5, the arrangement 8 with its locations 9, the selection of a motif point 10 with associated virtual mirror arrangement 15, the anticipated select an area 11, the views valid from the area for a particular location 12 and 13 in a sequence.
  • the orientation of the selected virtual mirror (or the selected virtual mirror group) is transferred to the mirror (or mirror group) in the final distribution 8. If the number of preselected virtual mirrors falls below a certain value, the corresponding final mirror can be given a (pseudo) random or fixed predefined orientation.
  • a separate virtual mirror arrangement 15 is created for each motif point 10.
  • the orientation of the virtual mirrors is determined such that for this motif point 10, the views corresponding to the movement effect would be reproduced by the virtual micromirror arrangement 15.
  • FIG. 5C z. B. on the basis of the distance to the motif point 10 preselected certain virtual mirror. This provides the area 11. Only he is considered for the motif point 10 below.
  • an alignment of the virtual devices 15 is selected for each location 9 of the distribution 8. For this purpose, in each virtual arrangement the corresponding location 9 is considered, and from the arrangements with preselected virtual mirrors at these locations 9, a random or pseudorandom one is selected.
  • the views 12, 13 for the location which is shown by way of example by a line, are relevant, i. H. they have this place 9 in the area 11 selected for them.
  • Speed of light reflections are chosen randomly or pseudorandomly, so that only at a certain viewing angle, a view appears, showing the basic motif. As the viewing angle changes, the views change so that reflections diverge in all directions.
  • a "pumping effect" can be created by arranging the motif dots as in # 1 to form the contour and / or face of one or more basic motifs, eg, symbols. 1, the movement of all points at the same speed is selected radially to any point, and the speed can also be selected proportionally to the distance between this point and the respective motive point.
  • a "morph effect” can be generated by selecting the positions, directions of movement and velocities of the light reflections such that a view A is visible at a first viewing angle, while a view B is visible at a second viewing angle between the above two values, each light reflex travels from its position in view A to its position in view B, and a morph effect is visible. 4.
  • a "flip effect” can be created by choosing the motif points so that the views show two different subjects A and B. The individual mirror arrangements are selected such that each motif point belonging to motif A only has mirror alignments in one A different angle range is selected for each motif point of motif B. As soon as the viewing angle leaves the first angle range, motif B disappears. However, as soon as its angle range is considered, the motif B appears overlap negligibly, created in this way a representation that abruptly turns from motif A to motif B.
  • a spatial effect can be created by arranging the motif points as in No. 1 to match the contour and / or area of one or more basic motifs, e.g. As symbols form.
  • the direction and speed of movement of all points are chosen to be the same so that the display appears to move back and forth as the viewing angle changes. If the movement is at least partially parallel or antiparallel to the direction of tilt, creates a parallax and thus a spatial effect.
  • An enhanced spatial effect can be generated when two motifs are created according to No. 5, with the directions of movement being anti-parallel.
  • dynamic motifs based on bitmap representations are provided.
  • a multi-stage process with three steps is used.
  • a number of mirror orientations are defined. For example, an even subdivision of the accessible borrow parameter space in one or two dimensions.
  • the mirror alignment can be quantified, for example, by using the Cartesian coordinate system 4 whose xy plane is parallel to the substrate plane below the mirrors.
  • Each mirror surface 16 is assigned a normal vector whose projections in the xz plane and yz plane each enclose an angle with the z axis.
  • angles are denoted by a x and a y and uniquely determine the orientation of the respective mirror 3 (see again FIG. 3, which shows the quantization of the mirror alignment via normal vector N as well as its projections into the yz or xz coordinate planes ).
  • An example of a set of mirror orientations can be defined as follows: A table is created with angle values for the angles ct x and ety, where the values for a y are equal within the lines and from line to line in 5 ° increments change from -45 ° to 45 °. The values for a x are the same within the columns and also change from column to column in 5 ° increments from -45 ° to 45 °. In each cell, therefore, there is a ct x / a y value pair which uniquely describes a mirror orientation.
  • a view of the motif is selected / created for each of the defined orientations, which consists of light and dark areas. The views and their sequence are arbitrary.
  • FIG. 6 which on the left depicts the assignment of different light / dark views 14 to individual mirror orientations and, on the right, the superimposition of the different views 15.
  • the mirror orientation ⁇ is linked to the illumination angle ⁇ and the viewing angle ⁇ via the reflection condition.
  • views of a subject are mappings of one or more bodies in different positions, e.g. For example, the contours of the bodies are shown as light lines while the rest of the bodies and the background are dark. The transition between the views creates the impression that the subject, z. For example, the body shifts, rotates, its size changes, disappears / appears.
  • the use of the letter "A" in FIG. 6 is purely exemplary.
  • a "selective interleaving" is applied to produce a mirror arrangement which, when viewed at a viewing angle ⁇ , has a similar brightness distribution as the image associated with the mirror orientation ⁇ .
  • each view 14 on the entire surface i. H. Distribution 8 of the micromirror 3 in the array is projected.
  • FIG. 7A on the left side, views to be effective in tilting the security element S up / down / left / right are shown, and in FIG. 7B, a mark of an exemplary mirror position 15 is seen in all views 14.
  • FIG. 7C shows the preselection of all views 14 which have a bright point at the corresponding location (light / dark representations are shown negatively here for better visibility).
  • Fig. 7C these are the first, second, and fourth and fifth views 14 from the left. They correspond in Fig. 7B the views 14 top left, top center, left center and central.
  • the remaining views 14 have no bright spot at the mirror position 17 under consideration and are therefore not selected in the subgroup. From the thus selected subset of all views, a view 14 is selected randomly or pseudorandomly or based on a particular rule.
  • the orientation of the mirror 3 corresponds to that mirror alignment which is required for the selected view 14 at this location 9 of the distribution 8.
  • selection rules are: 1. The views are iteratively distributed among the available mirrors so that each view is assigned the same number of mirrors as possible (eg within +/- 10%).
  • the views are distributed iteratively to the existing mirrors so that the orientations of adjacent mirrors are as similar as possible (eg within +/- 10%) or as different as possible (eg differing by at least 70% from each other).
  • the respective view (s) are (are) selected for all mirrors and therefore appear very bright in places
  • the mirror can be given a specific or (pseudorandom) randomly selected orientation.
  • a view and the corresponding mirror orientation can be selected, or an alignment is selected that is not part of the previously defined alignments.
  • the angles a x and a y can again be random numbers, assume the value 0 or assume extreme values, so that the corresponding mirror is only visible at very flat viewing angles.
  • the views show a letter "A” in different positions, the views are assigned to the mirror orientations so that the "A” performs a continuous movement as the viewing angle changes.
  • the "A” can only be seen in views whose corresponding mirror orientations lie within a specific angular range Wl In all views whose mirror orientations lie in an angular range W2, the "B" can be seen.
  • the perspectives are chosen to approximate (or have a definite relationship to) the mirror orientations.
  • the views show snapshots of a continuous movement sequence / a continuously changing overall scene.
  • the snapshots are assigned to the mirror orientations such that when the viewing angle is changed, the motion sequence is visible.

Landscapes

  • Optical Elements Other Than Lenses (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un élément de sécurité pour un papier de sécurité, un document de valeur ou similaire, élément de sécurité dans lequel une distribution d'une pluralité de micro-miroirs est disposée sur un support, chaque micro-miroir s'illuminant, pour un éclairage prédéfini, suivant un angle d'observation déterminé qui dépend d'une orientation du micro-miroir respectif par rapport à une normale à la surface du support, et l'élément de sécurité représente un motif clair/obscur doté d'une résolution spatiale et présente, en tant qu'effet de déplacement pour le motif, différentes vues du motif dépendantes de l'angle d'observation, du fait que, dans chaque vue, un sous-ensemble de micro-miroirs s'illumine, les sous-ensembles étant imbriqués les uns dans les autres en termes de position de leurs micro-miroirs dans la distribution. L'imbrication est telle qu'aux emplacements de la distribution auxquels se situe un point clair dans une première vue et en même temps se situe un point obscur d'une deuxième vue, un micro-miroir dans un premier sous-ensemble est prévu seulement pour la première vue mais pas pour la deuxième vue.
EP18725397.6A 2017-05-12 2018-05-09 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 Pending EP3621819A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017004586.0A DE102017004586A1 (de) 2017-05-12 2017-05-12 Sicherheitselement mit Mikrospiegelanordnung zur Erzeugung eines optisch variablen Effekts und Herstellverfahren für das Sicherheitselement
PCT/EP2018/000249 WO2018206148A1 (fr) 2017-05-12 2018-05-09 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

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EP3621819A1 true EP3621819A1 (fr) 2020-03-18

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Country Link
EP (1) EP3621819A1 (fr)
CN (1) CN110636946B (fr)
DE (1) DE102017004586A1 (fr)
WO (1) WO2018206148A1 (fr)

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