EP3864455A1 - Module optique, instrument optique et procédé - Google Patents

Module optique, instrument optique et procédé

Info

Publication number
EP3864455A1
EP3864455A1 EP18788695.7A EP18788695A EP3864455A1 EP 3864455 A1 EP3864455 A1 EP 3864455A1 EP 18788695 A EP18788695 A EP 18788695A EP 3864455 A1 EP3864455 A1 EP 3864455A1
Authority
EP
European Patent Office
Prior art keywords
lens unit
image
lens
optical
image plane
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.)
Withdrawn
Application number
EP18788695.7A
Other languages
German (de)
English (en)
Inventor
Peter Kaszian
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.)
Eardley Holding Ag
Original Assignee
Eardley Holding Ag
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 Eardley Holding Ag filed Critical Eardley Holding Ag
Publication of EP3864455A1 publication Critical patent/EP3864455A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/36—Microscopes arranged for photographic purposes or projection purposes or digital imaging or video purposes including associated control and data processing arrangements
    • G02B21/361—Optical details, e.g. image relay to the camera or image sensor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/58—Optics for apodization or superresolution; Optical synthetic aperture systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G02B9/06—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only two + components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Definitions

  • the present invention relates to an optical assembly.
  • the invention further relates to an optical instrument which comprises the optical assembly and a method for increasing the resolution of an optical instrument.
  • Distance of 25 cm is regarded as the conventional visual range or reference visual range.
  • the eye can achieve the best spatial resolution for longer periods. If the object is held close to the eye between 25 and 10 cm, a correspondingly better one can be used for short periods
  • Specialized eyepiece and / or image sensor, telephoto lenses or astroobjectives are specifically adapted for increasing distance and macro lenses, microobjectives and nanoobjectives are specifically adapted for increasing compression of the optical information.
  • Focal length-extending optics (so-called extenders), image-transmitting optics (so-called relay optics) and a projection lens can be mounted between the lens and eyepiece / storage medium as well as a projection lens in the projection microscope. In all these cases the quality, i.e. the resolution and contrast of the images.
  • the object of the present invention was to provide an alternative device or an alternative
  • the present invention relates to an optical assembly comprising a first lens unit and a second
  • An intermediate image plane is defined between the first lens unit and the second lens unit.
  • the first lens unit is set up to image an image from a first image plane into an enlarged real intermediate image in the intermediate image plane.
  • a set of possible beam paths through the first lens unit defines a first entrance area in the first image plane and defines it in the
  • the second lens unit is set up to image an image from the intermediate image plane into an enlarged real image in a second image plane.
  • a set of possible beam paths through the second lens unit defines a second in the intermediate image plane
  • the second entry area comprises a first part of the first exit area and excludes a second part of the first exit area.
  • the first image plane lies on the entry side of the first lens unit and the second image plane lies on the exit side of the second lens unit.
  • An optical axis can pass from the entry side of the optical assembly through the first lens unit and the second
  • Lens unit run through to an exit side of the optical assembly.
  • the intermediate image plane is essentially perpendicular to the optical axis.
  • the image in the first image plane can be formed by an object to be imaged, or it can itself be a real intermediate image which is generated by an optical system connected upstream of the optical assembly according to the invention. That in the second
  • the resulting enlarged real image has the desired increased resolution.
  • This enlarged real image that arises in the second image plane can be further enlarged by further subsequent optical elements, viewed through an eyepiece or recorded with an image sensor.
  • the first lens unit has a first entrance opening and a first magnification factor greater than 1, both of which are the possible beam paths through the first Affect lens unit.
  • the second one is the first lens unit.
  • Lens unit a second entrance opening and a second magnification factor greater than 1, both of which influence the possible beam paths through the second lens unit.
  • the first and second entry areas as well as the first and second exit areas are flat
  • the first exit area and the second entry area are both defined in the intermediate image plane. It is characteristic of the optical assembly according to the invention that only part of the first
  • Exit area is overlapped by the second entry area. You can zoom into a detail at this overlap area, so to speak. Only rays that belong to a section of the intermediate image enter through the opening of the second lens unit. I.e. in contrast to a so-called relay optics, not the whole
  • the lens units can consist of a single lens.
  • the lens units can also include mirrors as elements.
  • the first lens unit and the second lens unit can each be constructed as a group of lenses.
  • the two lens units, and optionally other optical elements, can be installed in a common outer tube.
  • Such an outer tube can, for example, on the inside Grooves are provided or blackened to prevent stray light
  • elements can be provided which prevent indirect radiation paths from the second part of the first exit region from entering the input opening of the second lens unit.
  • magnifying lens unit includes the first
  • Entry area a first part of the first image plane and excludes a second part of the first image plane.
  • an exit region of the further lens unit can be positioned with respect to the first image plane in such a way that the further lens unit and the first lens unit form a further optical assembly according to the invention, the further
  • Lens unit has the role of the first lens unit of the further optical assembly and the first
  • optical assembly according to the invention could be used as
  • Multiproj ejection module because there is at least twice a real intermediate image - a projection - generated, namely in the intermediate image plane and in the second image plane.
  • the first lens unit has a first focal length and the second lens unit has a second focal length.
  • the distance from the first lens unit to the intermediate image plane defines a first image width and the distance from the second
  • Lens unit to the second image plane defines a second image width.
  • a ratio of the first focal length to the first image width is in the range 1:10 to 1: 1000.
  • a ratio of the second focal length to the second image width is in the range 1:10 to 1: 1000.
  • the image width is significantly larger than the focal length of the
  • the image width is to be understood as the distance from the last lens of the lens unit to the real intermediate image generated.
  • the first lens unit have a focal length of 11 millimeters and be designed for an image width of 150 millimeters, that is to say have a focal length / image width ratio of approximately 1: 13.6.
  • the first lens unit can have a very short focal length of 0.2 millimeters and can be designed for an image width of 150 millimeters, that is to say have a focal length / image width ratio of 1: 750.
  • the second lens unit can have a focal length-image width ratio according to one of the examples for the first
  • the inventor has recognized that the imaging quality according to this embodiment is particularly high.
  • the ratio of the first focal length to the first image width and / or the ratio of the second focal length to the second image width is greater than or equal to 1:40.
  • the inventor has recognized that in this embodiment it is possible to achieve magnification factors of over 1000 times for the entire assembly with very high optical quality at the same time. This is particularly the case if both the ratio of the first focal length to the first image width and the ratio of the second
  • Focal length to the second image distance is greater than or equal to 1:40.
  • the first and / or the second lens unit has an infinite structure
  • the first and / or second objective unit can have the structure of an infinitely corrected microscope objective.
  • Infinity corrected lens is a
  • first and / or second lens units which both have an infinitely corrected structure, and where the ratio of the focal length to the
  • Image width is greater than or equal to 1:40.
  • the area of the first part of the first exit area is at most one tenth of the area of the first exit area.
  • the excluded second part of the first exit area is much larger than the first part of the first exit area, which corresponds to the second entry area and which is further enlarged by the second lens unit.
  • the area of the first part of the first exit region can
  • the at least one further lens unit is set up to convert an image from the intermediate image plane into an enlarged real image in another
  • Map image plane A set of possible beam paths through the further objective unit defines a further entry area in the intermediate image plane and defines a further exit area in the further image plane, the further entry area being different from the first entry area.
  • the further lens unit has the same function as the second lens unit Exception that it is directed to another entry area. A number of such others
  • Objective units can be arranged next to one another, for example in the manner of a compound eye
  • Each of the other lens units can be any lens unit. Insect.
  • Each of the other lens units can be any lens unit.
  • the further entry areas can be arranged, for example, in a hexagonal arrangement, the further entry areas being able to overlap slightly with one another or with the second entry area at the edge. In this way, parts of the image can be drawn from a large part of the first exit area or from the entire first
  • Embodiment of the optical assembly can, for example, be installed in an optical instrument, in which the further objective units each have a separate one
  • the second lens unit and the further lens units can each be a spherical or an aspherical lens in one
  • Microlens array can be formed, such as
  • Microlens array can comprise 100 to 1000 individual microlenses, that is to say further lens units arranged in parallel.
  • the first lens unit is configured in such a way that it passes through different radial areas of the first lens unit Focus points formed in the area of the intermediate image plane in the direction of an optical axis of the first lens unit are less than 500 nanometers apart, preferably less than 50 nanometers apart.
  • the second lens unit is designed such that the focal points formed by different radial areas of the second lens unit in the
  • Area of the second image plane in the direction of an optical axis of the second lens unit are less than 500 nanometers apart, preferably less than 50 nanometers apart.
  • Area in which the focus points of a lens unit fall i.e. the extent of the area in which the paraxial focus, the center zone focus and the
  • Edge ray focus is a measure of spherical aberration.
  • the spherical aberration of the first and / or the second lens unit is corrected to a high or very high degree.
  • the inventor has recognized that the quality of the image is due to a low spherical aberration of the individual
  • a low spherical aberration can be achieved by a suitably shaped aspherical lens or lens groups with at least one suitably shaped aspherical lens, which are built into the lens unit.
  • a another way to reduce spherical aberration can be achieved by a suitably shaped aspherical lens or lens groups with at least one suitably shaped aspherical lens, which are built into the lens unit.
  • Refractive index-defined aberration correction plate with plan, parallel surfaces to be built into a lens unit at a point where the rays are convergent or divergent.
  • the inventor has recognized that an optimization of the lens units with respect to the spherical aberration to a degree at which the focal points are typically closer than 50 nanometers, ie closer than one tenth
  • the chromatic aberration can be corrected.
  • This correction can be called a so-called
  • the optical assembly has a common mount for the first lens unit and the second lens unit.
  • the first lens unit and the second lens unit can be displaced relative to one another parallel to a common optical axis.
  • the first lens unit and the second lens unit can be displaced relative to one another in a range of 5 mm to 5 cm.
  • Lens units are adjusted so that the common intermediate image plane comes to lie at a suitable distance from the two lens units.
  • the first lens unit and the second lens unit have identical characteristics.
  • One embodiment of the optical assembly comprises three or more lens units arranged one behind the other, each pair of adjacent lens units forming an optical assembly according to the invention,
  • the basic element of the optical assembly comprising two lens units, can be expanded in a cascade.
  • a lens unit enlarges a section of the real image and projects it into a defined distance, where the next lens unit turns a section of this real image into a
  • the real image of the last projection lens can, for example, be made visible via a converging lens and / or an eyepiece, and the image of the object, which is now greatly enlarged and rich in detail, can be made visible via a storage medium or the eye.
  • the optical instrument according to the invention comprises an optical assembly according to the invention and further comprises an image sensor or an eyepiece, the image sensor or the eyepiece being arranged downstream of the second lens unit.
  • the image sensor can have, for example, light-sensitive detector elements arranged in a matrix.
  • image sensors are, for example, in the form of So-called charge-coupled device sensors (CCD sensors) are commercially available.
  • One embodiment of the optical instrument has a perforated diaphragm arranged on the entry side of the optical assembly.
  • the pinhole forms
  • Instruments thus works in the manner of a pinhole camera (camera obscura), in which no setting for a specific object distance is necessary.
  • the optical instrument according to this embodiment could be called a multiscope instrument.
  • the same basic structure of the input lens multiprojection module eyepiece or lens multiprojection module image sensor can be used to build a universal passive optical instrument which is equally suitable for the areas of astro, telephoto, macro, micro and nano photography.
  • the multiprojection module here is the optical one according to the invention
  • an arrangement consists of any input object, a projection lens, a converging lens and an eyepiece in question, the individual elements being arranged in the order mentioned along an optical axis.
  • the input lens is constructed as a telephoto lens.
  • This embodiment is suitable for imaging objects at a greater distance.
  • setting elements for focusing and for a zoom setting can be integrated in the telephoto lens.
  • the subsequent optical assembly with the first and second lens elements further increase the resolution.
  • the input objective has an entry opening greater than or equal to 90 millimeters and has a focal length greater than or equal to 400 millimeters.
  • the invention further relates to an optical instrument, in particular a microscope, which is constructed as an optical instrument according to the invention and wherein
  • Input lens is constructed as a microscope lens.
  • This embodiment is particularly suitable for approaching the object very close to an object to be imaged.
  • the input objective has an entrance opening less than or equal to 6 millimeters and a focal length less than or equal to 10 millimeters.
  • the optical instrument in particular a microscope, further comprises a specimen slide and an illumination unit, starting from the
  • Illumination unit illuminates a light beam from the illumination unit on one side of the slide, then passes through the first and second lens units and finally strikes the image sensor, the first lens unit and second lens unit mounted on a focusing unit being able to be moved together for a maximum of 50 nanometer steps for focusing.
  • the object is further achieved by a method according to claim 20.
  • the method according to the invention is a method for optical imaging by an optical instrument with a first lens unit and a second
  • the first lens unit converts a first image into an enlarged first real one
  • Lens unit real a portion of the first Intermediate picture in an enlarged second real one
  • optical instrument or microscope according to the invention are suitable for the method according to the invention
  • Embodiments correspond to the optical characteristics of a microscope objective. Examples are in
  • first and second lens units are specified, each of which is characterized by its focal length f and its input aperture D in millimeters:
  • Example No. 1 is an embodiment in which the first and second lens units have the same characteristics.
  • the input opening D of the lens units is significantly larger than the focal length f.
  • the quotient D / f lies in the
  • Lens unit in Examples Nos. 1, 2, 4 and 5) and approx. 61 see second lens unit in Example 5).
  • FIG. 1 schematically and simplified one
  • FIG. 2 schematically and simplified one
  • FIG. 3 schematically and simplified one
  • FIG. 4 schematically and simplified one
  • Lens unit arranged lens units.
  • FIG. 1 shows an optical assembly 100 according to the invention, comprising a first lens unit 10 and a second lens unit 20. An optical axis 4 is shown, which passes through both lens units runs through. Input side of the first
  • a first image plane 1 is defined for the lens unit, and there is one between the two lens units
  • Intermediate image plane 2 is defined and a second image plane 3 is defined on the output side of the second lens unit.
  • the levels mentioned are imaginary levels, the position of which is determined by the optical
  • Imaging properties and mutual position of the first and second lens unit is defined.
  • Lens unit 10 is set up to image an image from a first image plane 1 into an enlarged real intermediate image in the intermediate image plane 2.
  • a total of possible beam paths through the first lens unit lies in a kind of entrance cone, which is indicated by dashed lines and
  • the second lens unit 20 is set up to image an image from the intermediate image plane 2 into an enlarged real image in a second image plane 3.
  • Beam paths through the second lens unit also a kind of entrance cone, which is indicated by dashed lines, and defined cut with the
  • a second flat entry area 21 is defined in the second picture plane.
  • the second Entry area 21 comprises a first part of the first exit area, which is hatched diagonally from top left to bottom right in the figure, and excludes a second part of the first exit area.
  • the second excluded area is hatched diagonally from bottom left to top right.
  • Mapping steps have the first entry area 11 and the first exit area 12 hatched in the same way and are the second entry area 21 and the second
  • Hatching does not represent any image content. Arrows on the optical axis 4 indicate the direction of the image.
  • Figure 2 shows a schematic cross section through an embodiment of an optical instrument.
  • An optical assembly 100 is located in the section indicated by a curly bracket. The positions of the first image plane 1, the second image plane 3 and the
  • Intermediate image level 2 is shown with a dashed line.
  • the real pictures respectively.
  • Intermediate images and excerpts from the images and intermediate images are each indicated by arrows in the respective plane, the direction of the arrow indicating the position of the image.
  • a viewed object 60 in an object plane is imaged into the first image plane 1 by an input objective 30.
  • a section 63 from this image 62 is through the first lens unit 10 in the
  • a section 65 of the image 64 in the intermediate image plane is in turn by the second lens unit 20 imaged in the second image plane 3.
  • the image 66 created there is imaged by a converging lens 40 into an image sensor plane 51, behind which an image sensor 50, for example a CCD sensor, is arranged.
  • the figure shown is not to scale.
  • the extension of the optical elements 10, 20, 30, 40 in the direction of the optical axis 4 can be significantly larger.
  • the object 60 under consideration can lie, for example, at a distance of 0.5 meters up to an infinite distance.
  • the input lens 30 may have an input aperture of 90 millimeters or more.
  • the input lens 30 can have a focal length of 400 millimeters or more, for example.
  • the first 10 and second lens unit 20 can both be, for example
  • the first 10 and second lens unit 20 can be of the same type, for example, and an input opening of 6
  • FIG. 3 shows an embodiment of a microscope 300 analogously to FIG. 2.
  • the input objective 30 is a
  • Microscope lens The distance from
  • Object 60 to be imaged up to the input lens is small compared to the diameter of the input lens.
  • input lens 30 may have an input aperture of 6 millimeters or less and may have a focal length of 10 millimeters or less.
  • Image sensor 50 can be constructed in the same way as in FIG. 2.
  • FIG. 4 shows an embodiment in which at least one further lens unit is arranged next to the second lens unit. There are two more in this figure
  • Lens units 20 'and 20' ' shown. They have the same function as the second lens unit 20, but each image a different further entry area 21 ', 21' 'onto a further exit area 22', 22 '' in a further image plane 3 ', 3' '. In the case shown, the entry area 21 'is spatially different from the
  • Entry areas 21 and 21 ′′ partially overlap.
  • the image planes 3, 3 'and 3' ' can have different positions and orientations in space, but they can also be identical planes.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

L'invention concerne un module optique (100) comprenant une première unité d'objectif (10) et une deuxième unité d'objectif (20), un plan d'image intermédiaire (2) étant défini entre la première unité d'objectif et la deuxième unité d'objectif. La première unité d'objectif (10) est conçue pour représenter une image d'un premier plan d'image (1) dans une image intermédiaire réelle agrandie dans le plan d'image intermédiaire (2). Une totalité de trajets de rayons possibles à travers la première unité d'objectif définit, dans le premier plan d'image, une première zone d'entrée (11) et, dans le plan d'image intermédiaire, une première zone de sortie (12). La deuxième unité d'objectif (20) est conçue pour représenter une image du plan d'image intermédiaire (2) dans une image réelle agrandie dans un deuxième plan d'image (3). Une totalité de trajets de rayons possibles à travers la deuxième unité d'objectif définit, dans le plan d'image intermédiaire, une deuxième zone d'entrée (21) et, dans le deuxième plan d'image, une deuxième zone de sortie (22). La deuxième zone d'entrée (21) comprend une première partie de la première zone de sortie et exclut une deuxième partie de la première zone de sortie. L'invention concerne en outre un instrument optique comprenant le module optique et un procédé.
EP18788695.7A 2018-10-09 2018-10-09 Module optique, instrument optique et procédé Withdrawn EP3864455A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/077422 WO2020074065A1 (fr) 2018-10-09 2018-10-09 Module optique, instrument optique et procédé

Publications (1)

Publication Number Publication Date
EP3864455A1 true EP3864455A1 (fr) 2021-08-18

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Application Number Title Priority Date Filing Date
EP18788695.7A Withdrawn EP3864455A1 (fr) 2018-10-09 2018-10-09 Module optique, instrument optique et procédé

Country Status (12)

Country Link
US (1) US20210392248A1 (fr)
EP (1) EP3864455A1 (fr)
KR (1) KR20210069069A (fr)
CN (1) CN112805608A (fr)
AU (1) AU2018445019A1 (fr)
BR (1) BR112021005488A2 (fr)
CA (1) CA3111041A1 (fr)
IL (1) IL282149A (fr)
MX (1) MX2021002831A (fr)
RU (1) RU2768520C1 (fr)
SG (1) SG11202102838XA (fr)
WO (1) WO2020074065A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1260653A (en) * 1968-01-25 1972-01-19 Watson W & Sons Ltd Improvements in or relating to optical apparatus
JP2002267940A (ja) * 2001-03-09 2002-09-18 Olympus Optical Co Ltd 倒立型顕微鏡システム
EP1941314A4 (fr) * 2005-10-07 2010-04-14 Univ Leland Stanford Junior Agencements et techniques de microscopie
US20100171820A1 (en) * 2007-06-28 2010-07-08 Koninklijke Philips Electronics N.V. Lens system
CN101710131B (zh) * 2009-12-01 2011-06-01 西安交通大学 离焦数字三维微流场荧光测试仪
RU2429509C1 (ru) * 2010-05-27 2011-09-20 Государственное Научное Учреждение "Институт Физики Имени Б.И. Степанова Национальной Академии Наук Беларуси" Способ оптической обработки изображения и оптическая система для него
US8908294B2 (en) * 2012-05-18 2014-12-09 Canon Kabushiki Kaisha Catadioptric optical system with high numerical aperture
JP2014115411A (ja) * 2012-12-07 2014-06-26 Canon Inc レンズアレイ、画像形成装置及び画像読取装置
US9170414B2 (en) * 2013-02-27 2015-10-27 Yancy Corp. Method and apparatus for producing a super-magnified wide-field image

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Publication number Publication date
MX2021002831A (es) 2021-08-16
CA3111041A1 (fr) 2020-04-16
CN112805608A (zh) 2021-05-14
BR112021005488A2 (pt) 2021-06-22
SG11202102838XA (en) 2021-05-28
US20210392248A1 (en) 2021-12-16
WO2020074065A1 (fr) 2020-04-16
AU2018445019A1 (en) 2021-03-25
RU2768520C1 (ru) 2022-03-24
IL282149A (en) 2021-05-31
KR20210069069A (ko) 2021-06-10

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