EP3864344B1 - Module lumineux du véhicule automobile - Google Patents

Module lumineux du véhicule automobile Download PDF

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Publication number
EP3864344B1
EP3864344B1 EP19778437.4A EP19778437A EP3864344B1 EP 3864344 B1 EP3864344 B1 EP 3864344B1 EP 19778437 A EP19778437 A EP 19778437A EP 3864344 B1 EP3864344 B1 EP 3864344B1
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EP
European Patent Office
Prior art keywords
motor vehicle
projection
light
microprojector
screen element
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.)
Active
Application number
EP19778437.4A
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German (de)
English (en)
Other versions
EP3864344A1 (fr
Inventor
Peter Schadenhofer
Alexander Hacker
Josef Gürtl
Bernhard Mandl
Christian Jackl
Anke Müller
Siegmar Hackl
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.)
ZKW Group GmbH
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ZKW Group GmbH
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Publication date
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Publication of EP3864344A1 publication Critical patent/EP3864344A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2103/00—Exterior vehicle lighting devices for signalling purposes
    • F21W2103/60—Projection of signs from lighting devices, e.g. symbols or information being projected onto the road

Definitions

  • the invention relates to a motor vehicle light module comprising at least one microprojector, and at least one at least partially translucent projection screen element, wherein the at least one microprojector is set up to generate a light distribution, the light distribution onto the at least one at least partially translucent projection screen element in the form of a predefinable light pattern is projectable.
  • the invention relates to a motor vehicle headlight or a motor vehicle with at least one such motor vehicle light module.
  • motor vehicle light modules of the type mentioned above are known in the prior art. Such motor vehicle light modules are often used in (visual) communication systems or as design lights, for example to project corresponding signs onto the road surface in the immediate vicinity of a motor vehicle in which they are installed. Other automotive light modules are from the EP 2 503 222 A1 , DE 10 2016 118790 A1 or FR 3 034 728 A1 known.
  • the object of the present invention is to provide a motor vehicle light module with which luminous vehicle branding is possible and which can be used as a communication element (with the analogue environment).
  • the information can be represented in the form of a symbol, a logo, lettering or similar.
  • the at least one projection wall element can therefore at least partially scatter and at least partially absorb the light forming the light distribution, whereby the predeterminable light pattern - seen from the motor vehicle light module - becomes visible to the outside.
  • the motor vehicle light module according to the invention makes it possible, for example, to significantly enhance luminous design branding, since luminous lettering is significantly more visible, for example, at night.
  • the motor vehicle light modules according to the invention can also be used for communication elements (with the analog world) in the area of autonomous driving.
  • the microprojector has at least one light source set up to generate light and a projection device, the projection device being downstream of the at least one light source in the emission direction and being set up to shape the light distribution and to project it onto the at least one at least partially translucent projection screen element to project.
  • the projection device has at least one projection lens and at least one aperture, the at least one aperture being arranged in a focal plane of the at least one projection lens and having aperture edges, which aperture edges have a shape corresponding to the predefinable light pattern.
  • the aperture is preferably arranged in a plane transverse to the optical axis of the microprojector (see figures). In this case, the aperture can lie entirely in the focal plane instead of just intersecting it.
  • the aperture edges form at least one symbol that is information to be displayed, which symbol preferably lies completely in the focal plane.
  • the projection device has a plurality of projection lenses arranged in a matrix-like manner in an array - projection lens array - and a plurality of apertures arranged in a matrix-like manner in an array - aperture array - with each projection lens being assigned one, preferably exactly one, aperture, the aperture edges being different Apertures are designed the same or different. This allows several identical or different lighting patterns to be created. Can be used with multiple apertures For example, letters of an alphabet, logos, such as vehicle manufacturer branding, danger symbols and much more can be realized.
  • the projection lens array can be an optical body made of a material such as plastic.
  • the optical body can also be a composite of a glass plate and a silicone lens array that adheres to the glass plate.
  • the projection lens and/or aperture array preferably extends in a plane transverse to the optical axis.
  • the at least one projection lens has a lens diameter between 1 and 5 mm, preferably 2 mm, is preferably at least partially made of glass or silicone, and/or the projection screen element is separated from the at least one projection lens by approximately 1 cm to about 10 cm apart.
  • the light intensity on the projection screen element is sufficient to make the light pattern visible.
  • the light pattern becomes hardly measurable at a distance of 10-25m from a white wall (measuring screen in a lighting technology laboratory), which means that no problems with approval (maximum scattered light values) are to be expected. No powerful light sources are required either. If, as stated below, low-power LED light sources are used, they do not require a heat sink designed to cool these LED light sources.
  • the at least one light source is a semiconductor-based light source, for example an LED light source. If there are multiple light sources, they can emit light of different colors. This means that the attention of passers-by or other road users can be attracted much more effectively.
  • the microprojector additionally comprises a collimator arranged between the at least one light source and the projection device. This can, for example, ensure more uniform illumination of the aperture(s).
  • the at least one projection screen element is a transparent layer with a grained surface or a milky plastic or glass pane or a clear plastic or clear glass pane with scattering particles contained therein.
  • the scattering particles are normally not visible to the eye in transparent or clear materials such as plastic or glass.
  • the milky plastic disc can be made of opaque plastic, for example.
  • the milky plastic disc can also be obtained by a special coating on the surface of a (transparent) plastic disc or by gluing a corresponding film to the surface of a transparent plastic disc.
  • milky plastic discs with a light transmission of about 20% to about 70% are used.
  • the scattering particles serve to ensure that the light coupled into the plastic pane is ideally coupled out uniformly across the surface.
  • a pane from Evonik appears transparent, but when light from a light source, such as an LED light source or a microprojector, penetrates it, it is scattered by the particles, as just mentioned.
  • the task is also achieved with a motor vehicle headlight with at least one aforementioned motor vehicle light module.
  • the at least one microprojector is arranged in a (rear) region of a motor vehicle headlight and the at least one projection wall element is designed, for example, as a region of a motor vehicle headlight cover.
  • the task is solved with a motor vehicle with at least one aforementioned motor vehicle light module.
  • the at least one projection screen element is arranged on a front of the motor vehicle, preferably formed in an area of a radiator grille of the motor vehicle.
  • the “area of a radiator grille” is understood to mean an area in which the radiator grille is arranged in conventional motor vehicles. However, since, for example, the radiator grille no longer exists in the usual form in modern electric vehicles, the term “area of a radiator grille” is understood to mean an area on the front of the motor vehicle in which the radiator grille would be arranged.
  • a further advantage of the present invention is that the at least one microprojector is not visible from the outside by the downstream projection screen element and is also protected from environmental influences (rock chips, solar radiation, chemicals, etc.).
  • partially transparent projection screen element a projection screen element having light-scattering elements, which partially allows the light incident on the projection screen element to pass through, partly scattered (in all directions) and partly absorbed.
  • the amount of scattered light is enough so that a light distribution projected onto the projection screen element is visible on both sides of the projection screen element (with the naked eye, day and night).
  • the light-scattering elements cause the image projected onto the projection screen element by means of the microprojector to be visible both on a side of the projection screen element facing the microprojector and on a side facing away from the microprojector.
  • the partially transparent projection screen element can For example, a milky plastic disc, a transparent disc with a grained surface or a plastic disc with scattered particles contained in it (e.g. from Evonik).
  • FIG. 1 shows a light module 1, which can correspond to a motor vehicle light module not according to the invention.
  • the light module 1 has a microprojector 2 and an at least partially translucent projection screen element 3 .
  • the microprojector 2 is set up to generate a predeterminable light distribution 4 , which is projected onto the at least partially translucent projection screen element 3 in the form of a predeterminable light pattern 5 when the microprojector 2 is switched on. Because the projection screen element 3 is partially translucent, the light forming the light distribution 4 is at least partially scattered on the projection screen element 3. As a result, the predeterminable light pattern 5 becomes visible on a side 30 of the projection screen element 3 facing away from the microprojector 2 when the light module 1 is put into operation.
  • the dem The side 30 of the projection screen element 3 facing away from the microprojector 2 is preferably one
  • the side facing the microprojector 2 is the opposite side of the projection screen element 3.
  • the microprojector 2 is designed in such a way that the predefinable light pattern 5 contains optically displayed information. It is understood that the light distribution 4 generated by the microprojector 2 carries information that is displayed by projecting onto the projection screen element 3.
  • the visibility of the light pattern 5 on the side 30 facing away from the microprojector 2 has the advantage that, for example, a predetermined message can be sent into the surroundings of the light module 1.
  • the projection screen element 3 can be arranged transversely to the optical axis of the light module 1, like this Figures 1 to 5 reveal. However, it is certainly conceivable to arrange the projection screen element at an angle to the optical axis, for example to take vehicle contours into account.
  • the at least one projection screen element 3 can be designed, for example, as a transparent layer with a grained surface or, as already mentioned, a milky plastic disk or a plastic disk with scattering particles contained therein.
  • projection screen element 3 should be at least partially transparent so that it can scatter at least part of the incident light forward (for example in the emission direction Z).
  • a rough surface can be provided for projection screen elements made of clear materials.
  • the roughness depth can be in the micrometer range and can be, for example, approximately 5 to 40 micrometers, preferably 10 to 30 micrometers, in particular 20 ⁇ m.
  • the projection screen element 3 can be a pane from Evonik, which is made of glass or polymers and has a smooth surface.
  • the projection screen element 3 can be a milky disk or a disk with scattering particles contained therein.
  • the microprojector 2 can have one or more light sources 20 .
  • the light source can, for example, also be another, for example semiconductor-based light source, such as a laser light source.
  • the microprojector 2 also has a projection device 21 , which is downstream of the light source(s) (20) in the emission direction Z and is set up To shape light distribution 4 and to project it onto the at least one at least partially translucent projection screen element 3.
  • the light sources 20 can be arranged in a matrix-like manner in an array.
  • the LED light sources can be installed on a common ( Figure 4 ) or on separate boards ( Figure 5 ) can be arranged, which are essentially perpendicular to the radiation direction Z.
  • the projection screen element 3 is preferably arranged essentially perpendicular to the radiation direction Z. However, it is certainly conceivable to position the projection screen element 3 at an angle to the radiation direction Z and thus to generate light patterns 5 on inclined surfaces (projection screen elements). In addition, it is conceivable that the projection screen element has 3 areas in different colors. Furthermore, it is possible to design the projection screen element 3 in a predetermined color. This increases the number of design possibilities even more.
  • the projection device 21 can have one or more projection lenses 210 and one or more apertures 211 assigned to the projection lenses 210.
  • Each projection lens 21 can, for example, be plano-convex or plano-concave or even a free-form lens.
  • at least one projection lens 210 is assigned to each aperture 211.
  • Both the projection lenses 210 and the diaphragms 211 can be arranged in a matrix-like plane, preferably in a plane that is essentially perpendicular to the radiation direction Z.
  • all projection lenses 210 and apertures 211 can each have a single ( Figure 4 ) or several separate ones ( Figure 5 ) form monolithic structures.
  • the aperture(s) 211 is(are) arranged, preferably completely, in a focal plane of the respective projection lens(es) 210.
  • each aperture 211 has aperture edges 212 which have a shape corresponding to the predefinable light pattern 5.
  • the aperture edges 212 of each aperture 211 can form a pattern that corresponds to the entire predeterminable light pattern 5 ( Figures 1 to 3 ) or just parts of it ( Figure 4 and 5 ) is congruent.
  • the light pattern 5 created on the projection screen element 3 can therefore be predetermined by the shape and course of the aperture edges 212 of the at least one aperture 212.
  • the light pattern can also be generated on a light conversion element using a laser if the light source(s) are laser light source(s) (not shown).
  • each aperture 211 can therefore form a symbol or part of the symbol that constitutes information to be displayed.
  • the apertures 211 can, for example, be designed as metal plates with openings of a corresponding shape or printed on one side of a glass or plastic substrate using a lithography process.
  • Projection lenses 210 for example made of silicone, can be applied to the opposite side of the glass or plastic substrate.
  • the glass or plastic substrate serves as a support for projection lenses 210 and in this case it is referred to as a composite lens.
  • the apertures 211 are obtained by applying a corresponding photoresist or by means of metallization and laser cutting.
  • the symbols can be very different: letters, logos (which, for example, allows for luminous vehicle manufacturer branding), symbols such as warning signs and so on.
  • the projection lenses 210 in the in Figures 1 to 5 The light modules shown have a lens diameter between 1 and 5 mm, preferably 2 mm, and can be at least partially made of silicone. Furthermore, the projection lenses 210 can contain epoxy resins, acrylates or other plastics or can be made from these materials.
  • the projection screen element 3 can be spaced from the projection lens(es) by approximately 1 cm to approximately 10 cm.
  • Figure 2 shows an embodiment of the light module 1, in which the aperture 211 has several projection lenses 210 (a 3x3 array is shown) downstream. This makes it possible to better adjust the light intensity within the predeterminable light pattern 5 or to make the light pattern 5 brighter. Such a configuration is of course possible with the light modules in the Figures 1 and 3 to 5 possible.
  • the projection screen element 3 is arranged in the image focal plane of the projection device 21.
  • the image focal plane of the projection device 21 is at infinity. This will the projection screen element 3 of the projection device 21 in the radiation direction Z at a defined distance, for example from about 10 mm to about 100 mm, preferably from about 25 mm to 50 mm, downstream and thus the light pattern 5 visible on both sides of the projection wall element 3 is generated.
  • the light intensity of the light pattern 5 can vary depending on the power of the light source, such as an LED light source, and a distance between the microprojector 2 and the projection screen element 3.
  • Figure 3 shows that the microprojector 2 can additionally include a collimator 22 arranged between the light source 20 and the projection device 21.
  • a collimator can also be installed in the Figures 1, 2 and 4 , 5 Microprojectors shown are provided and downstream of the corresponding light source.
  • Figure 4 shows an example with several LED light sources 20, apertures 211 and projection lenses 210, with each LED light source 20 being assigned exactly one aperture and exactly one projection lens 210.
  • Such a system can be conceptually combined into a partial microprojector. If the LED light sources 20 can be controlled separately from one another, then the above-mentioned message can be a whole word, a number, a whole sentence or a lettering. The individual letters of the word can appear either all together or in a predetermined time sequence on the projection screen element 3.
  • Figure 5 shows a light module 1, which has several microprojectors 2.
  • Each microprojector 2 can be controlled independently of the other microprojectors 2.
  • each microprojector 2 has several LED light sources 20 and several apertures 211 with different symbols. If the control of the microprojectors 2 is coordinated with one another, the number of possible different lighting patterns 5 and thus the number of messages to be sent is significantly increased.
  • the Figure 5 It can also be seen that the entire message does not have to be generated by the same microprojector 2: one microprojector projects the symbol "G" onto the - in this case common - projection screen element 3, another - the symbols "O" and ">" and a third - the symbol ">".
  • the light module 1 of the Figure 5 can be improved by designing each projection lens 210 as a lens array. It is particularly advantageous if exactly one LED corresponds to each lens in the lens array. This allows a particularly sharp image to be generated because distortions in the edge area of the projection lens 210 are reduced.
  • the projection lens can be designed as a 3x3 lens array - similar to the arrangement of the projection lenses 210 in the Figure 4 - be designed and thus correspond to the arrangement of the individual LEDs on the board, which also form a 3x3 array.
  • microprojectors 2 and/or light sources 20 or arrays of LED light sources these can be arranged next to one another.
  • the light modules described above can be used, for example, for design innovations in the main headlight area (illuminating logos, lettering, etc.), but also as communication elements (with the analogue environment), for example in the area of automated or autonomous driving.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Road Signs Or Road Markings (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Claims (8)

  1. Module d'éclairage pour véhicule automobile (1) comprenant
    - au moins un microprojecteur (2), et
    - au moins un élément d'écran de projection (3) au moins partiellement translucide, dans lequel
    l'au moins un microprojecteur (2) est conçu pour générer une distribution de lumière (4), la distribution de lumière pouvant être projetée sur l'au moins un élément d'écran de projection (3) au moins partiellement transparent sous la forme d'un motif lumineux (5) pouvant être prédéfini, où
    le motif lumineux (5) pouvant être prédéfini est visible dans un état allumé du module d'éclairage (1) du véhicule automobile sur un côté (30) de l'élément d'écran de projection (3) opposé au microprojecteur (2) et contient des informations représentées optiquement, dans lequel
    le microprojecteur (2) comporte au moins une source de lumière (20) agencée pour produire de la lumière et un dispositif de projection (21), le dispositif de projection (21) étant placé en aval de la au moins une source de lumière (20) dans la direction de rayonnement (Z) et étant agencé pour former la répartition de lumière (4) et pour la projeter sur le au moins un élément d'écran de projection (3) au moins partiellement transparent, caractérisé en ce que
    le dispositif de projection (21) présente au moins une lentille de projection (210) et au moins un diaphragme (211), le au moins un diaphragme (211) étant disposé dans un plan focal de la au moins une lentille de projection (210) et présentant des bords de diaphragme (212), lesquels bords de diaphragme (212) présentent une forme correspondant au modèle lumineux (5) pouvant être prédéfini, dans lequel
    les bords d'ouverture (212) forment au moins un symbole (213) qui est une information à afficher, et dans lequel
    le dispositif de projection (21) présente une pluralité de lentilles de projection (210) disposées à la manière d'une matrice dans un réseau et une pluralité de diaphragmes (211) disposés à la manière d'une matrice dans un réseau, à chaque lentille de projection (210) étant associé exactement un diaphragme (211), les arêtes de diaphragme (212) de différents diaphragmes (211) étant réalisées de manière identique ou différente, et dans lequel
    à chaque source lumineuse sont associés exactement un diaphragme et exactement une lentille de projection, les sources lumineuses pouvant être commandées séparément les unes des autres, où.
    l'au moins une lentille de projection (210) présente un diamètre de lentille compris entre 1 et 5 mm, de préférence 2 mm, est de préférence au moins partiellement en verre ou en polymère, comme du plastique ou du silicone, et/ou l'élément d'écran de projection (3) est espacé de l'au moins une lentille de projection (210) d'environ 1 cm à environ 10 cm.
  2. Module d'éclairage pour véhicule automobile selon la revendication 1, caractérisé en ce que ladite au moins une source de lumière (20) est une source de lumière à base de semi-conducteurs, par exemple une source de lumière LED.
  3. Module d'éclairage pour véhicule automobile selon l'une des revendications 1 à 2, caractérisé en ce que le microprojecteur (2) comprend en outre un collimateur (22) disposé entre ladite au moins une source lumineuse (20) et le dispositif de projection (21).
  4. Module d'éclairage de véhicule automobile selon l'une des revendications 1 à 3, caractérisé en ce que ledit au moins un élément d'écran de projection (3) est une couche transparente avec une surface grainée ou une feuille de plastique ou de verre laiteuse ou une feuille de plastique ou de verre transparente avec des particules diffusantes contenues dans celle-ci.
  5. Projecteur de véhicule automobile comportant au moins un module d'éclairage de véhicule automobile (1) selon l'une des revendications 1 à 4.
  6. Projecteur de véhicule automobile selon la revendication 5, caractérisé en ce que l'au moins un microprojecteur (2) est disposé dans une zone d'un projecteur de véhicule automobile et l'au moins un élément d'écran de projection (3) est conçu par exemple comme une zone d'une glace de projecteur de véhicule automobile.
  7. Véhicule automobile comportant au moins un module d'éclairage de véhicule automobile selon l'une des revendications 1 à 4 ou comportant au moins un projecteur de véhicule automobile selon la revendication 5 ou 6.
  8. Véhicule automobile selon la revendication 7, caractérisé en ce que ledit au moins un élément d'écran de projection (3) est disposé à l'avant de celui-ci, de préférence formé dans une zone d'une calandre du véhicule automobile.
EP19778437.4A 2018-10-09 2019-09-17 Module lumineux du véhicule automobile Active EP3864344B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18199281.9A EP3636992A1 (fr) 2018-10-09 2018-10-09 Module lumineux du véhicule automobile
PCT/EP2019/074761 WO2020074218A1 (fr) 2018-10-09 2019-09-17 Module d'éclairage de véhicule automobile

Publications (2)

Publication Number Publication Date
EP3864344A1 EP3864344A1 (fr) 2021-08-18
EP3864344B1 true EP3864344B1 (fr) 2024-01-10

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EP18199281.9A Withdrawn EP3636992A1 (fr) 2018-10-09 2018-10-09 Module lumineux du véhicule automobile
EP19778437.4A Active EP3864344B1 (fr) 2018-10-09 2019-09-17 Module lumineux du véhicule automobile

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Country Link
US (1) US11555593B2 (fr)
EP (2) EP3636992A1 (fr)
JP (1) JP7153136B2 (fr)
KR (1) KR102546044B1 (fr)
CN (1) CN112789446A (fr)
WO (1) WO2020074218A1 (fr)

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WO2022102774A1 (fr) * 2020-11-16 2022-05-19 株式会社小糸製作所 Dispositif de rendu de surface de route
KR20230004141A (ko) * 2021-06-30 2023-01-06 현대모비스 주식회사 차량용 램프
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EP4441563A1 (fr) * 2021-12-02 2024-10-09 Lumileds LLC Projection d'un motif de lumière statique
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US11555593B2 (en) 2023-01-17
EP3864344A1 (fr) 2021-08-18
JP7153136B2 (ja) 2022-10-13
CN112789446A (zh) 2021-05-11
EP3636992A1 (fr) 2020-04-15
WO2020074218A1 (fr) 2020-04-16
KR20210044300A (ko) 2021-04-22
US20210388964A1 (en) 2021-12-16
KR102546044B1 (ko) 2023-06-21
JP2022504564A (ja) 2022-01-13

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