EP3587910A1 - Sauglüfter für scheinwerfer eines kraftfahrzeugs - Google Patents

Sauglüfter für scheinwerfer eines kraftfahrzeugs Download PDF

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Publication number
EP3587910A1
EP3587910A1 EP19178172.3A EP19178172A EP3587910A1 EP 3587910 A1 EP3587910 A1 EP 3587910A1 EP 19178172 A EP19178172 A EP 19178172A EP 3587910 A1 EP3587910 A1 EP 3587910A1
Authority
EP
European Patent Office
Prior art keywords
air
projector
extractor
air extractor
air inlet
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
EP19178172.3A
Other languages
English (en)
French (fr)
Inventor
Thibaut Menn
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP3587910A1 publication Critical patent/EP3587910A1/de
Pending legal-status Critical Current

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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
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/49—Attachment of the cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • 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
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • 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
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Definitions

  • the invention relates to an air extractor for a headlight, in particular an air extractor for a motor vehicle headlight.
  • the invention also relates to a projector comprising an air extractor and a motor vehicle comprising such a projector.
  • the invention finally relates to a method of using such an air extractor.
  • components of the spatial light modulator type to form segmented beams which can be activated selectively.
  • Light source arrays are an example of components of the spatial light modulator type.
  • these dies heat up a lot due to their number and the rise in temperature rapidly degrades their performance.
  • components of the spatial light modulator type is also known components of the LCD screen type or micro-mirror arrays (also called DMD for the acronym of digital micromirror device).
  • a projector is in the form of a closed assembly comprising heating elements and positioned near a motor, and the temperature inside the projector can reach high values, and the temperature limit for use of the components is quickly exceeded.
  • a second drawback is that the repair of such a system, in the event of a fan failure, is complicated to perform. It is thus preferable to replace the entire projector or the housing comprising the components of the spatial light modulator type, which involves additional costs.
  • a general object of the invention is to provide a projector solution improving the existing solutions, and allowing the use of heating components without risk of exceeding their operating temperature limit.
  • a first object of the invention is to find a compromise making it possible to use components of the spatial light modulator type, within a projector by keeping their temperature below their operating limit value while guaranteeing sealing. of the projector.
  • a second object of the invention is to provide a solution for a projector which is simple to implement and inexpensive.
  • the invention relates to an air extractor for a vehicle headlight comprising: an air inlet and an air outlet; a ventilation chamber disposed between said air inlet and said air extractor air outlet, said ventilation chamber comprising a fan arranged to produce an air flow from the air inlet to the outlet air; and a sealing system for external particles.
  • the exterior particle sealing system comprises at least one closure means designed to assume an open position and a closed position.
  • the open position allowing fluid communication between the air outlet and the air inlet and the closed position allowing at least the passage of external particles between the air outlet and the air inlet.
  • the air extractor comprises a device for controlling the at least one closure means.
  • the at least one closure means is arranged in the air outlet and / or in the air inlet.
  • the at least one closure means is movable between the open position and the closed position by rotation along an axis or by translation.
  • the external particle sealing system comprises, between the ventilation chamber and the air outlet, a channel having a curvature.
  • said channel has a slope when the air extractor is integrated into a projector for discharging liquid towards the air outlet.
  • the air outlet includes a grid.
  • the air inlet includes a guide oriented on the upper side of the air extractor.
  • the invention relates to a headlight for a vehicle comprising an air extractor according to the first aspect of the invention.
  • the projector further includes a projector air inlet optionally including an air filter.
  • the air extractor is arranged on an upper and / or rear part of the projector.
  • the headlight air inlet is arranged on a lower and / or front part of the headlight.
  • the air extractor is removably attached to the projector.
  • the projector further comprises at least one optical module comprising at least one electronic component and at least one system for cooling said electronic component, said cooling system comprising only a conduction cooling system.
  • the at least one electronic component can be a spatial light modulator.
  • external particles designates an element present in the external environment of the projector and capable of reducing the performance of the components present in the projector by contact.
  • the external particles may include, without limitation, dust, water, oil splashes, detergent splashes or sheets.
  • the concept of the invention is based on the use of an air extractor, arranged at the level of a projector, making it possible to evacuate the hot air present in the projector to replace it with fresh air, to reduce the average air temperature inside a projector and therefore the temperature of the components positioned inside the projector.
  • This principle is illustrated schematically by the figure 1 , which represents a headlamp 103 mounted on a motor vehicle 101 equipped with an air extractor 102 according to an embodiment of the invention.
  • the attachment of such an air extractor 102 to the projector 103 is removable, to allow its replacement in the event of failure.
  • the projector 103 comprises at least one optical module 105.
  • This optical module comprises one or more components sensitive to temperature, comprising for example, at least one component of the spatial light modulator type, a semiconductor component, a MEMS, a matrix micro-mirrors, a liquid crystal display or a laser.
  • this optical module comprises a proper cooling system for the electronic component (s): however, since the optical module is integrated in a projector comprising an air extractor according to an embodiment of the invention, which limits its average temperature , this clean cooling system can be simple and include only conduction and natural convection cooling. Thus, the optical module does not include a fan. It is thus simplified compared to the usual optical modules comprising the same electronic components. Naturally, the invention remains compatible with these traditional optical modules comprising their own cooling system with fan (s).
  • natural convection is meant a convection which is not forced, that is to say carried out without a fan or any other similar means making it possible to impose an air flow locally in contact with or near the optical module.
  • the headlight 103 further comprises a lens 106, arranged flush or projecting with respect to the body 107 of the vehicle 101.
  • the air extractor 102 is arranged on or through a wall of the projector 103.
  • the air extractor can thus achieve fluid communication between the interior and the exterior of the projector 103.
  • the air extractor 102 is arranged so as to allow the extraction of air inside the projector towards the outside of the projector 103.
  • the projector comprises an air inlet 104 of the projector. The warm air inside the projector is replaced by cooler air and the overall temperature of the air inside the projector decreases.
  • the air extractor 102 is preferably arranged on the upper part of the projector 103.
  • the hot air being less dense than the cold air
  • the air inside the projector 103 is warmer in the part projector 103 than at the bottom.
  • the arrangement of the air extractor 102 in the upper part of the projector 103 thus advantageously makes it possible to extract the hottest air towards the outside of the projector and thus promotes the descent in temperature of the air to the inside of projector 103.
  • the air extractor 102 comprises an air guide, the inlet of which is arranged on the upper part of the projector 103.
  • the air extractor 102 could then be arranged on a lower part or a intermediate part located between the lower part and the upper part of the projector 103, the air guide making it possible to bring the hot air situated in the upper part of the projector 103 to the extractor.
  • an air inlet 104 of the projector is arranged on the lower part of the projector 103.
  • the air inlet of the projector 104 can be arranged on the lower surface 108 of the projector.
  • the air inlet of the projector 104 is located below a horizontal plane passing through the air extractor 102.
  • the air inlet of the projector 104 is arranged on the front part of the projector 104, that is to say the part closest to the lens 106 of the projector 103.
  • Such an arrangement of the the air inlet of the headlight 104 advantageously allows a cooler air inlet inside the headlight 103, in particular by moving the air inlet of the headlight 104 away from the engine of the vehicle 101, generally located behind the projector 103.
  • the air inlet of the projector 104 comprises an air guide, the inlet of which is arranged on the front part and / or on the lower part of the projector 103.
  • the air inlet of the projector 104 may include an air filter.
  • the air filter advantageously allows the passage of air from the outside to the inside of the projector 103 by preventing external particles from entering the interior of the projector 103 by the air inlet of the projector 104.
  • the air extractor 201 comprises an air inlet 203 and an air outlet 214, more particularly represented on the figure 2C .
  • the air extractor 201 also comprises a ventilation chamber 210.
  • Said ventilation chamber 210 is advantageously disposed between said air inlet 203 and said air outlet 214 of the air extractor 201.
  • the ventilation chamber 210 comprises a fan 202. By fan is meant any means for generating an air flow between the air inlet 203 and the air outlet 214.
  • the fan 202 can be a radial fan, an axial fan or any other type of fan. In one embodiment, the fan 202 is designed to generate an air flow at the air outlet whose speed is substantially equal to 5 meters per second. In one embodiment, the fan 202 is designed to generate an air flow at the air outlet of between 100 and 500 L / min.
  • the air extractor 201 is arranged in the rear and upper part of a projector 213, in a similar manner to the diagram of the figure 1 .
  • the air inlet 203 is arranged to be positioned inside the projector 213.
  • the air outlet 214 is arranged to be outside the projector 213.
  • the fan 202 thus makes it possible to draw the hot air internally inside the projector 213 through the air inlet 203 and expel it to the outside of the projector 213 and the air outlet 214 from the air extractor.
  • the air extractor 201 also includes a sealing system, at least to the external particles.
  • the sealing system is also airtight.
  • the exterior particle sealing system prevents exterior particles present in the air outside the projector 213 from entering the interior of the projector 213 when the fan is off or when the fan is not activated. .
  • the air extractor does not include an air filter, which avoids creating too great a resistance to the air flow.
  • the sealing system comprises a shutter means 206.
  • the shutter means 206 can be located in the ventilation chamber 210, in the air inlet 203 or in the air outlet 214.
  • the shutter means 206 may be a hatch covering the entire section of the air extractor.
  • the shutter means 206 is designed to be able to take or to be able to move between two positions: an open position ( figure 2C ) allowing fluid communication between the air inlet and the air outlet of the air extractor and a closed position ( figure 2B ) to at least prevent the passage of external particles between the air outlet and the air inlet.
  • the shutter means 206 is movable between two limit positions: the closed position and the open position.
  • the shutter means 206 can cover a section of the air extractor so as to prevent at least the external particles from passing through this section.
  • Said section can be located in the ventilation chamber 210, in the inlet or outlet of the air extractor.
  • the shutter means 206 may be a hatch made of gas-impermeable material or of material permeable to air and impermeable to external particles.
  • the shutter means 206 can be movable between a closed position ( figure 2B ) and an open position ( figure 2C ) by a translational movement or by a shutter system.
  • the air extractor 201 may also include an air guide 204.
  • the air guide 204 makes it possible to fluidly connect the air inlet 203 of the air extractor with the ventilation chamber 210.
  • the air guide 204 thus makes it possible to provide an air extractor 201 comprising an air inlet 203 oriented towards the upper side of the extractor.
  • This air guide 204 thus advantageously allows the air inlet 203 to be placed towards the top of the projector.
  • the air guide 204 allows the suction of the air from the projector in the highest possible position, therefore the warmest air 211, rather than the cooler air 212 present in the lower part of the projector.
  • the air guide 204 comprises a longitudinal channel or pipe.
  • the air guide 204 makes it possible to form a tortuous path for the air, which also contributes to limiting the possibilities of passage of any external particles from the outside towards the inside of the projector, and therefore participates in the sealing function.
  • the air extractor 201 may also include leaktight seals 208 to guarantee the seal between the extractor 201 and the projector 213 and / or between the walls of the extractor 201 and the sealing means 206.
  • the 2D figure illustrates a variant of the first embodiment, in which the closure means 206 is disposed at the entrance to the ventilation chamber 210.
  • the two alternative embodiments can also be combined.
  • the projector further comprises a control device 209 for the air extractor 201, shown in the Figures 2A and 2D .
  • This control device can comprise an activator, arranged to control the opening and closing of the at least one shutter means 206.
  • the activator 209 can comprise a motor or an animated arm making it possible to move the shutter means 206.
  • the control device may further include a processor 207 and / or a printed circuit.
  • the processor can be connected to the activator 209 by a communication means, in order to control the shutter means via the activator.
  • the control device is configured to trigger the operation of the air extractor when the engine of the vehicle 101 is started, and to stop it when the engine is stopped.
  • the Figures 3A and 3B represent an air extractor 301 according to a second embodiment, respectively in open and closed configuration.
  • the air extractor 301 comprises at least one shutter means 306 movable in rotation.
  • the closure means 306 can be movable in rotation around a pivot 309, oriented in the transverse direction.
  • This closure means 306 is designed for, in the closed position represented by the figure 3A , simultaneously close the inlet and the outlet of the ventilation chamber 310. In the open position represented by the figure 3B , it simultaneously opens the inlet and the outlet of the ventilation chamber 310.
  • this shutter means could open and close the air inlet 303 and the outlet 314 of the air extractor 301.
  • the closure means 306 is of sufficient length on either side of the pivot 309 to, in the closed position, make it possible to cover the section of the inlet of the ventilation chamber 310 and the section of the outlet of the ventilation chamber 310.
  • the ventilation chamber 310 may include leaktight seals 308 disposed between the pivot 309 and the wall of the projector 313.
  • the extractor 301 may also include a seal 308 between the ventilation chamber and the walls of the projector.
  • the closure means 306 may comprise a surface 305 which is impermeable to external particles and permeable to gases.
  • the air extractor 301 further comprises an air guide 304 designed so that the air inlet of the extractor 303 is oriented upwards or towards the upper face of the projector 313.
  • the extractor 301 can suck in the hottest gases 311, rather than the colder gases 312 located in the bottom of the projector.
  • an air extractor 401 likewise comprises an air inlet 403, then an air guide 404 to a ventilation chamber 410 equipped with at least one fan 402.
  • the sealing system comprises an outlet channel 405 having at least one curvature.
  • This outlet channel 405 having at least one curvature is arranged between the ventilation chamber 410 comprising the fan 402 and the air outlet 414 of the air extractor 404.
  • the outlet channel 405 may comprise several curvatures .
  • said outlet channel 405 comprises a curvature between 150 ° and 200 °, that is to say that it guides the air extracted by the air extractor 401 along a trajectory comprising such a significant curvature, before it leaves the extractor.
  • Such a curve substantially around 180 °, allows the outlet channel 405 to orient the air outlet 414 towards the rear wall of the projector 413.
  • the air outlet 414 is not oriented towards the motor of the vehicle. This orientation makes it impossible or very difficult, when the fan is off, for the penetration of external particles inside the projector by the air extractor.
  • the output channel 405 thus fulfills the function sealing.
  • the sealing system could be implemented by any other channel having at least one curvature, not necessarily positioned at the outlet of the air extractor.
  • the outlet channel 405 further comprises a filter or a grid 415 near the air outlet 414. This grid makes it possible to brake or stop the external particles, which will tend to deposit on this grid. rather than traveling the route through the outlet channel 405.
  • the grid 415 covers the section of the outlet channel 405.
  • the grid completely covers the section of the outlet channel 405 at the air outlet 414.
  • the grid comprises a succession of flaps or wires. The spacing between each adjacent flap or between each adjacent wire is between 0.5 and 3 mm
  • the outlet channel 405 further extends over a length sufficient to seal the external particles of the air extractor 401.
  • the outlet channel 405 can extend over a length at least greater than 25 mm and / or less than 200mm.
  • the diameter or the width of the section of the outlet channel 405 can be between 15 and 50 mm.
  • the dimensions of the section of the outlet channel 405 contribute to the sealing of the air extractor 401, while allowing the passage of the air flow during the operation of the fan 402.
  • this solution is that it abstains from the use of mechanical devices such as mobile sealing means, such as Shutters.
  • this solution can also do without an air filter.
  • the outlet channel 405 can also be designed to, once mounted on the headlight 413 and on a vehicle, have a slope so that water which would be present in the outlet channel, for example following a projection or by condensation, either evacuated by gravity through the air outlet 414 of the extractor 401.
  • the air outlet 414 when the air extractor is mounted on a headlight on a vehicle, is advantageously arranged at a height lower than the air outlet from ventilation chamber 410.
  • the ventilation chamber is designed to have a slope with respect to a horizontal plane. This slope allows, once the extractor mounted on a headlight of a vehicle, to allow an outward flow of water on the walls of the ventilation chamber, without entering the headlight.
  • the upper part of the ventilation chamber arranged outside the projector, has a slope with a horizontal plane so as to evacuate the water. In these embodiments, the water cannot stagnate in the air extractor, nor penetrate inside the projector.
  • a flap can be movable according to a movement other than a translation or a rotation, or according to a translation in a direction other than that described in the first embodiment, or according to a rotation around an axis oriented in a direction other than that described in the second embodiment.
  • the at least one closure means may comprise at least two or a plurality of flaps.
  • the different flaps are configured to perform a rotational movement in a synchronized manner.
  • Each flap is arranged to, in the closed position, cover part of the section of the air extractor.
  • the flaps are arranged so that, when they are all in the closed position, they cover the entire section of the air extractor.
  • the at least one sealing means comprises a double flap.
  • the air extractor comprises a control device, such as that described with reference to the first embodiment.
  • This control device can also implement a method of extracting air from a headlight, comprising in particular a method of activating the air extractor, automatically triggered when the motor vehicle is started, and automatically stopped when the motor vehicle engine stops.
  • the projector and / or the air extractor thus comprises a movable shutter means, and comprises hardware and / or software elements for implementing the air extraction method.
  • the displacement step is executed at least one second, preferably at least 3 or 4 seconds, very preferably between 3 and 6 seconds after the execution of the activation step.
  • the activation of the fan causes the ventilation chamber to be put under overpressure before the opening of the shutter means.
  • This overpressure advantageously makes it possible to guarantee that no dust can enter the interior of the projector through the extractor when it is put into operation.
  • the step of activating the fan can be preceded by a step of receiving a control signal, for example a signal generated when the engine is started, is energized.
  • a control signal for example a signal generated when the engine is started
  • the deactivation step is executed at least one second, preferably at least 3 or 4 seconds, very preferably between 3 and 6 seconds after the execution of the displacement step. In this way, it can be guaranteed that no dust can enter the interior of the projector through the extractor when it is stopped.
  • the displacement step can be preceded by a step of receiving a control signal, for example a signal generated when the engine is off, is de-energized.
  • a control signal for example a signal generated when the engine is off

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Projection Apparatus (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP19178172.3A 2018-06-08 2019-06-04 Sauglüfter für scheinwerfer eines kraftfahrzeugs Pending EP3587910A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1855040A FR3082279B1 (fr) 2018-06-08 2018-06-08 Extracteur d'air pour projecteur de vehicule automobile

Publications (1)

Publication Number Publication Date
EP3587910A1 true EP3587910A1 (de) 2020-01-01

Family

ID=63145064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19178172.3A Pending EP3587910A1 (de) 2018-06-08 2019-06-04 Sauglüfter für scheinwerfer eines kraftfahrzeugs

Country Status (5)

Country Link
US (1) US10767831B2 (de)
EP (1) EP3587910A1 (de)
JP (1) JP7401983B2 (de)
CN (1) CN110578910A (de)
FR (1) FR3082279B1 (de)

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CZ2019588A3 (cs) * 2019-09-16 2021-03-24 Varroc Lighting Systems, s.r.o. Světelné zařízení pro motorové vozidlo
CN111921915A (zh) * 2020-08-04 2020-11-13 海宁新月照明电器有限公司 一种用于采矿工人专用的照明头灯
KR102344337B1 (ko) * 2020-08-28 2021-12-29 우성파워텍주식회사 제습이 가능한 차량용 램프

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Publication number Priority date Publication date Assignee Title
US5230719A (en) * 1990-05-15 1993-07-27 Erling Berner Dehumidification apparatus
US6497507B1 (en) * 1998-03-31 2002-12-24 Antje Weber Headlight or light
FR2779804A1 (fr) * 1998-06-11 1999-12-17 Valeo Vision Projecteur de vehicule automobile pourvu de moyens de refroidissement perfectionnes, et correcteur d'assiette associe
JP2002124123A (ja) * 2000-10-17 2002-04-26 Denso Corp 車両用前照灯
DE102009055681A1 (de) * 2009-11-25 2011-05-26 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeugleuchte
DE102013218327A1 (de) * 2013-09-12 2015-03-12 Automotive Lighting Reutlingen Gmbh Kfz-Beleuchtungseinrichtung
US20180073701A1 (en) * 2016-09-13 2018-03-15 Hyundai Motor Company Head lamp for vehicle including moisture removing apparatus
US20180149334A1 (en) * 2016-11-28 2018-05-31 Automotive Lighting Reutlingen Gmbh Headlight and method for operating the headlight

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FR3082279A1 (fr) 2019-12-13
JP7401983B2 (ja) 2023-12-20
CN110578910A (zh) 2019-12-17
JP2020017521A (ja) 2020-01-30
FR3082279B1 (fr) 2021-06-11
US10767831B2 (en) 2020-09-08
US20190376660A1 (en) 2019-12-12

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